TS4962M [STMICROELECTRONICS]
3W filter-free class D audio power amplifier; 3W无过滤器，D类音频功率放大器
| 型号： | TS4962M |
| 厂家： | 
ST |
| 描述： | 3W filter-free class D audio power amplifier |
| 文件： | 总41页 (文件大小：1107K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TS4962M
3W filter-free class D audio power amplifier
Features
Pin connections
■ Operating from V = 2.4V to 5.5V
CC
GND
2/A2
IN+
OUT-
3/A3
■ Standby mode active low
1/A1
■ Output power: 3W into 4Ω and 1.75W into 8Ω
VDD
GND
6/B3
VDD
with 10% THD+N max and 5V power supply.
5/B2
4/B1
■ Output power: 2.3W @5V or 0.75W @ 3.0V
into 4Ω with 1% THD+N max.
STBY
8/C2
OUT+
9/C3
IN-
7/C1
■ Output power: 1.4W @5V or 0.45W @ 3.0V
into 8Ω with 1% THD+N max.
IN+: positive differential input
IN-: negative differential input
VDD: analog power supply
GND: power supply ground
STBY: standby pin (active low)
OUT+: positive differential output
OUT-: negative differential output
■ Adjustable gain via external resistors
■ Low current consumption 2mA @ 3V
■ Efficiency: 88% typ.
■ Signal to noise ratio: 85dB typ.
■ PSRR: 63dB typ. @217Hz with 6dB gain
■ PWM base frequency: 250kHz
■ Low pop & click noise
Block diagram
B1
B2
Vcc
Stdby
C2
Internal
Bias
Out+
150k
C3
A3
■ Thermal shutdown protection
■ Available in flip-chip 9 x 300μm (Pb-free)
C1
A1
Output
H
-
In-
In+
PWM
+
Bridge
150k
Oscillator
Out-
Description
GND
A2
The TS4962M is a differential Class-D BTL power
amplifier. It is able to drive up to 2.3W into a 4Ω
load and 1.4W into a 8Ω load at 5V. It achieves
outstanding efficiency (88%typ.) compared to
classical Class-AB audio amps.
B3
Applications
The gain of the device can be controlled via two
external gain-setting resistors. Pop & click
reduction circuitry provides low on/off switch noise
while allowing the device to start within 5ms. A
standby function (active low) allows the reduction
of current consumption to 10nA typ.
■ Cellular phone
■ PDA
■ Notebook PC
January 2007
Rev 4
1/41
www.st.com
41
Contents
TS4962M
Contents
1
2
3
4
5
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Application component information . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical characteristic curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.1
5.2
5.3
Differential configuration principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Gain in typical application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Common mode feedback loop limitations . . . . . . . . . . . . . . . . . . . . . . . . . 29
For example: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Low frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.4
5.5
5.6
5.7
5.8
5.9
Decoupling of the circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Wake-up time: (tWU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Shutdown time (tSTBY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Consumption in shutdown mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Single-ended input configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.10 Output filter considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.11 Different examples with summed inputs . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Example 1: Dual differential inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Example 2: One differential input plus one single-ended input . . . . . . . . . . . . . . . 34
6
Demoboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Footprint recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
7
8
9
10
2/41
TS4962M
Absolute maximum ratings
1
Absolute maximum ratings
Table 1.
Symbol
Absolute maximum ratings
Parameter
Value
Unit
V
Supply voltage(1), (2)
6
VCC
Vin
Input voltage (3)
V
GND to VCC
Toper
Tstg
Tj
Operating free-air temperature range
Storage temperature
-40 to + 85
-65 to +150
150
°C
°C
Maximum junction temperature
Thermal resistance junction to ambient (4)
°C
Rthja
Pdiss
200
°C/W
Internally Limited(5)
Power dissipation
ESD
ESD
Human body model
2
200
kV
V
Machine model
Latch-up
VSTBY
Latch-up immunity
200
mA
V
Standby pin voltage maximum voltage (6)
Lead temperature (soldering, 10sec)
GND to VCC
260
°C
1. Caution: This device is not protected in the event of abnormal operating conditions, such as for example,
short-circuiting between any one output pin and ground, between any one output pin and VCC, and
between individual output pins.
2. All voltage values are measured with respect to the ground pin.
3. The magnitude of the input signal must never exceed VCC + 0.3V / GND - 0.3V.
4. The device is protected in case of over temperature by a thermal shutdown active @ 150°C.
5. Exceeding the power derating curves during a long period causes abnormal operation.
6. The magnitude of the standby signal must never exceed VCC + 0.3V / GND - 0.3V.
Table 2.
Symbol
Operating conditions
Parameter
Value
Unit
V
Supply voltage(1)
2.4 to 5.5
VCC
VIC
Common mode input voltage range(2)
Standby voltage input: (3)
V
0.5 to VCC - 0.8
VSTBY
V
1.4 ≤ VSTBY ≤ VCC
Device ON
Device OFF
GND ≤VSTBY ≤0.4 (4)
RL
Load resistor
≥ 4
Ω
Thermal resistance junction to ambient (5)
90
°C/W
Rthja
1. For VCC from 2.4V to 2.5V, the operating temperature range is reduced to 0°C ≤Tamb ≤70°C.
2. For VCC from 2.4V to 2.5V, the common mode input range must be set at VCC/2.
3. Without any signal on VSTBY, the device will be in standby.
4. Minimum current consumption is obtained when VSTBY = GND.
5. With heat sink surface = 125mm2.
3/41
Application component information
TS4962M
2
Application component information
Table 3.
Component information
Component
Functional description
Bypass supply capacitor. Install as close as possible to the TS4962M to
minimize high-frequency ripple. A 100nF ceramic capacitor should be
added to enhance the power supply filtering at high frequency.
Cs
Input resistor to program the TS4962M differential gain (gain = 300kΩ/Rin
with Rin in kΩ).
Rin
Due to common mode feedback, these input capacitors are optional.
However, they can be added to form with Rin a 1st order high pass filter with
-3dB cut-off frequency = 1/(2*π*Rin*Cin).
Input
capacitor
Figure 1.
Typical application schematics
Vcc
Cs
1u
B1
B2
Vcc
Vcc
In+
Stdby
C2
Internal
Bias
GND
Out+
150k
GND
C3
A3
Rin
Rin
GND
+
-
C1
A1
Output
H
-
Differential
Input
In-
In+
PWM
+
Bridge
SPEAKER
In-
Input
capacitors
are optional
150k
Oscillator
Out-
GND
A2
TS4962
GND
B3
GND
Vcc
Vcc
Cs
1u
B1
B2
Vcc
In+
Stdby
C2
Internal
Bias
4 Ohms LC Output Filter
15µH
GND
C3
Out+
150k
GND
+
Rin
Rin
GND
C1
A1
Output
H
-
Differential
Input
2µF
GND
In-
In+
PWM
+
Bridge
Load
-
In-
2µF
15µH
A3
Input
capacitors
are optional
150k
Oscillator
Out-
GND
A2
TS4962
GND
30µH
B3
GND
1µF
GND
1µF
30µH
8 Ohms LC Output Filter
4/41
TS4962M
Electrical characteristics
3
Electrical characteristics
Table 4.
Symbol
V
= +5V, GND = 0V, V = 2.5V, t
= 25°C (unless otherwise specified)
CC
IC
amb
Parameter
Conditions
No input signal, no load
No input signal, VSTBY = GND
Min.
Typ.
Max.
Unit
ICC
ISTBY
VOO
Supply current
2.3
10
3
3.3
1000
25
mA
nA
Standby current (1)
Output offset voltage No input signal, RL = 8Ω
mV
G=6dB
THD = 1% max, F = 1kHz, RL = 4Ω
2.3
3
1.4
1.75
Pout
Output power
W
%
THD = 10% max, F = 1kHz, RL = 4Ω
THD = 1% max, F = 1kHz, RL = 8Ω
THD = 10% max, F = 1kHz, RL = 8Ω
Pout = 900mWRMS, G = 6dB, 20Hz < F < 20kHz
Total harmonic
distortion + noise
RL = 8Ω + 15µH, BW < 30kHz
Pout = 1WRMS, G = 6dB, F = 1kHz,
RL = 8Ω + 15µH, BW < 30kHz
1
THD + N
0.4
Pout = 2WRMS, RL = 4Ω + ≥ 15µH
Pout =1.2WRMS, RL = 8Ω+ ≥ 15µH
78
88
Efficiency Efficiency
Power supply
%
F = 217Hz, RL = 8Ω, G=6dB,
Vripple = 200mVpp
PSRR rejection ratio with
63
57
dB
inputs grounded (2)
Common mode
CMRR
F = 217Hz, RL = 8Ω, G = 6dB,
ΔVicm = 200mVpp
dB
V/V
kΩ
rejection ratio
273kΩ
300kΩ
327kΩ
-----------------
-----------------
-----------------
Gain
RSTBY
FPWM
Gain value
Rin in kΩ
R
R
R
in
in
in
Internal resistance
from Standby to GND
273
180
300
250
327
320
Pulse width modulator
base frequency
kHz
SNR
tWU
Signal to noise ratio
Wake-up time
A-weighting, Pout = 1.2W, RL = 8Ω
85
5
dB
ms
ms
10
10
tSTBY
Standby time
5
5/41
Electrical characteristics
TS4962M
Table 4.
Symbol
V
= +5V, GND = 0V, V = 2.5V, t = 25°C (unless otherwise specified) (continued)
amb
CC
IC
Parameter
Conditions
Min.
Typ.
Max.
Unit
F = 20Hz to 20kHz, G = 6dB
Unweighted RL = 4Ω
A-weighted RL = 4Ω
85
60
Unweighted RL = 8Ω
A-weighted RL = 8Ω
86
62
Unweighted RL = 4Ω + 15µH
A-weighted RL = 4Ω + 15µH
83
60
VN
Output voltage noise
μVRMS
Unweighted RL = 4Ω + 30µH
A-weighted RL = 4Ω + 30µH
88
64
Unweighted RL = 8Ω + 30µH
A-weighted RL = 8Ω + 30µH
78
57
Unweighted RL = 4Ω + Filter
A-weighted RL = 4Ω + Filter
87
65
Unweighted RL = 4Ω + Filter
A-weighted RL = 4Ω + Filter
82
59
1. Standby mode is active when VSTBY is tied to GND.
2. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the superimposed sinusoidal signal to VCC @ F = 217Hz.
6/41
TS4962M
Electrical characteristics
(1)
Table 5.
Symbol
V
= +4.2V, GND = 0V, V = 2.5V, T
= 25°C (unless otherwise specified)
CC
IC
amb
Parameter
Conditions
No input signal, no load
No input signal, VSTBY = GND
Min.
Typ.
Max.
Unit
ICC
ISTBY
VOO
Supply current
2.1
10
3
3
mA
nA
Standby current (2)
1000
25
Output offset voltage No input signal, RL = 8Ω
mV
G=6dB
THD = 1% max, F = 1kHz, RL = 4Ω
1.6
2
0.95
1.2
Pout
Output power
W
%
THD = 10% max, F = 1kHz, RL = 4Ω
THD = 1% max, F = 1kHz, RL = 8Ω
THD = 10% max, F = 1kHz, RL = 8Ω
Pout = 600mWRMS, G = 6dB, 20Hz < F < 20kHz
RL = 8Ω + 15µH, BW < 30kHz
Pout = 700mWRMS, G = 6dB, F = 1kHz,
RL = 8Ω + 15µH, BW < 30kHz
Total harmonic
distortion + noise
1
THD + N
0.35
Pout = 1.45WRMS, RL = 4Ω + ≥ 15µH
Pout =0.9WRMS, RL = 8Ω+ ≥ 15µH
78
88
Efficiency Efficiency
Power supply
%
F = 217Hz, RL = 8Ω, G=6dB,
Vripple = 200mVpp
PSRR rejection ratio with
63
57
dB
inputs grounded (3)
Common mode
CMRR
F = 217Hz, RL = 8Ω, G = 6dB,
ΔVicm = 200mVpp
dB
V/V
kΩ
rejection ratio
273kΩ
300kΩ
327kΩ
-----------------
-----------------
-----------------
Gain
RSTBY
FPWM
Gain value
Rin in kΩ
R
R
R
in
in
in
Internal resistance
from Standby to GND
273
180
300
250
327
320
Pulse width modulator
base frequency
kHz
SNR
tWU
Signal to noise ratio
Wake-uptime
A-weighting, Pout = 0.9W, RL = 8Ω
85
5
dB
ms
ms
10
10
tSTBY
Standby time
5
7/41
Electrical characteristics
TS4962M
(1)
Table 5.
Symbol
V
= +4.2V, GND = 0V, V = 2.5V, T
= 25°C (unless otherwise specified)
CC
IC
amb
Parameter
Conditions
Min.
Typ.
Max.
Unit
F = 20Hz to 20kHz, G = 6dB
Unweighted RL = 4Ω
A-weighted RL = 4Ω
85
60
Unweighted RL = 8Ω
A-weighted RL = 8Ω
86
62
Unweighted RL = 4Ω + 15µH
A-weighted RL = 4Ω + 15µH
83
60
VN
Output voltage noise
μVRMS
Unweighted RL = 4Ω + 30µH
A-weighted RL = 4Ω + 30µH
88
64
Unweighted RL = 8Ω + 30µH
A-weighted RL = 8Ω + 30µH
78
57
Unweighted RL = 4Ω + Filter
A-weighted RL = 4Ω + Filter
87
65
Unweighted RL = 4Ω + Filter
A-weighted RL = 4Ω + Filter
82
59
1. All electrical values are guaranteed with correlation measurements at 2.5V and 5V.
2. Standby mode is active when VSTBY is tied to GND.
3. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the superimposed sinusoidal signal to VCC @ F = 217Hz.
8/41
TS4962M
Electrical characteristics
(1)
Table 6.
Symbol
V
= +3.6V, GND = 0V, V = 2.5V, T
= 25°C (unless otherwise specified)
CC
IC
amb
Parameter
Conditions
No input signal, no load
No input signal, VSTBY = GND
Min.
Typ.
Max.
Unit
ICC
ISTBY
VOO
Supply current
2
10
3
2.8
1000
25
mA
nA
Standby current (2)
Output offset voltage No input signal, RL = 8Ω
mV
G=6dB
THD = 1% max, F = 1kHz, RL = 4Ω
1.15
1.51
0.7
Pout
Output power
W
%
THD = 10% max, F = 1kHz, RL = 4Ω
THD = 1% max, F = 1kHz, RL = 8Ω
THD = 10% max, F = 1kHz, RL = 8Ω
0.9
Pout = 500mWRMS, G = 6dB, 20Hz < F< 20kHz
RL = 8Ω + 15µH, BW < 30kHz
Pout = 500mWRMS, G = 6dB, F = 1kHz,
RL = 8Ω + 15µH, BW < 30kHz
Total harmonic
distortion + noise
1
THD + N
0.27
Pout = 1WRMS, RL = 4Ω + ≥ 15µH
Pout =0.65WRMS, RL = 8Ω+ ≥ 15µH
78
88
Efficiency Efficiency
Power supply
%
F = 217Hz, RL = 8Ω, G=6dB,
Vripple = 200mVpp
PSRR rejection ratio with
62
56
dB
inputs grounded (3)
Common mode
CMRR
F = 217Hz, RL = 8Ω, G = 6dB,
ΔVicm = 200mVpp
dB
V/V
kΩ
rejection ratio
273kΩ
300kΩ
327kΩ
-----------------
-----------------
-----------------
Gain
RSTBY
FPWM
Gain value
Rin in kΩ
R
R
R
in
in
in
Internal resistance
from Standby to GND
273
180
300
250
327
320
Pulse width modulator
base frequency
kHz
SNR
tWU
Signal to noise ratio
Wake-uptime
A-weighting, Pout = 0.6W, RL = 8Ω
83
5
dB
ms
ms
10
10
tSTBY
Standby time
5
9/41
Electrical characteristics
TS4962M
(1)
Table 6.
Symbol
V
= +3.6V, GND = 0V, V = 2.5V, T
= 25°C (unless otherwise specified)
CC
IC
amb
Parameter
Conditions
Min.
Typ.
Max.
Unit
F = 20Hz to 20kHz, G = 6dB
Unweighted RL = 4Ω
A-weighted RL = 4Ω
83
57
Unweighted RL = 8Ω
A-weighted RL = 8Ω
83
61
Unweighted RL = 4Ω + 15µH
A-weighted RL = 4Ω + 15µH
81
58
VN
Output voltage noise
μVRMS
Unweighted RL = 4Ω + 30µH
A-weighted RL = 4Ω + 30µH
87
62
Unweighted RL = 8Ω + 30µH
A-weighted RL = 8Ω + 30µH
77
56
Unweighted RL = 4Ω + Filter
A-weighted RL = 4Ω + Filter
85
63
Unweighted RL = 4Ω + Filter
A-weighted RL = 4Ω + Filter
80
57
1. All electrical values are guaranteed with correlation measurements at 2.5V and 5V.
2. Standby mode is active when VSTBY is tied to GND.
3. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the superimposed sinusoidal signal to VCC @ F = 217Hz.
10/41
TS4962M
Electrical characteristics
(1)
Table 7.
Symbol
V
= +3V, GND = 0V, V = 2.5V, T
= 25°C (unless otherwise specified)
CC
IC
amb
Parameter
Conditions
No input signal, no load
No input signal, VSTBY = GND
Min.
Typ.
Max.
Unit
ICC
ISTBY
VOO
Supply current
1.9
10
3
2.7
1000
25
mA
nA
Standby current (2)
Output offset voltage No input signal, RL = 8Ω
mV
G=6dB
THD = 1% max, F = 1kHz, RL = 4Ω
0.75
1
0.5
0.6
Pout
Output power
W
%
THD = 10% max, F = 1kHz, RL = 4Ω
THD = 1% max, F = 1kHz, RL = 8Ω
THD = 10% max, F = 1kHz, RL = 8Ω
Pout = 350mWRMS, G = 6dB, 20Hz < F < 20kHz
RL = 8Ω + 15µH, BW < 30kHz
Pout = 350mWRMS, G = 6dB, F = 1kHz,
RL = 8Ω + 15µH, BW < 30kHz
Total harmonic
distortion + noise
1
THD + N
0.21
Pout = 0.7WRMS, RL = 4Ω + ≥ 15µH
Pout = 0.45WRMS, RL = 8Ω+ ≥ 15µH
78
88
Efficiency Efficiency
Power supply
%
F = 217Hz, RL = 8Ω, G=6dB,
Vripple = 200mVpp
PSRR rejection ratio with
60
54
dB
inputs grounded (3)
Common mode
CMRR
F = 217Hz, RL = 8Ω, G = 6dB,
ΔVicm = 200mVpp
dB
V/V
kΩ
rejection ratio
273kΩ
300kΩ
327kΩ
-----------------
-----------------
-----------------
Gain
RSTBY
FPWM
Gain value
Rin in kΩ
R
R
R
in
in
in
Internal resistance
from Standby to GND
273
180
300
250
327
320
Pulse width modulator
base frequency
kHz
SNR
tWU
Signal to noise ratio
Wake-up time
A-weighting, Pout = 0.4W, RL = 8Ω
82
5
dB
ms
ms
10
10
tSTBY
Standby time
5
11/41
Electrical characteristics
TS4962M
(1)
Table 7.
Symbol
V
= +3V, GND = 0V, V = 2.5V, T
= 25°C (unless otherwise specified)
CC
IC
amb
Parameter
Conditions
Min.
Typ.
Max.
Unit
f = 20Hz to 20kHz, G = 6dB
Unweighted RL = 4Ω
A-weighted RL = 4Ω
83
57
Unweighted RL = 8Ω
A-weighted RL = 8Ω
83
61
Unweighted RL = 4Ω + 15µH
A-weighted RL = 4Ω + 15µH
81
58
VN
Output Voltage Noise
μVRMS
Unweighted RL = 4Ω + 30µH
A-weighted RL = 4Ω + 30µH
87
62
Unweighted RL = 8Ω + 30µH
A-weighted RL = 8Ω + 30µH
77
56
Unweighted RL = 4Ω + Filter
A-weighted RL = 4Ω + Filter
85
63
Unweighted RL = 4Ω + Filter
A-weighted RL = 4Ω + Filter
80
57
1. All electrical values are guaranteed with correlation measurements at 2.5V and 5V.
2. Standby mode is active when VSTBY is tied to GND.
3. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the superimposed sinusoidal signal to VCC @ F = 217Hz.
12/41
TS4962M
Electrical characteristics
Table 8.
Symbol
V
= +2.5V, GND = 0V, V = 2.5V, T
= 25°C (unless otherwise specified)
CC
IC
amb
Parameter
Conditions
No input signal, no load
No input signal, VSTBY = GND
Min.
Typ.
Max.
Unit
ICC
ISTBY
VOO
Supply current
1.7
10
3
2.4
1000
25
mA
nA
Standby current (1)
Output offset voltage No input signal, RL = 8Ω
mV
G=6dB
THD = 1% max, F = 1kHz, RL = 4Ω
0.52
0.71
0.33
0.42
Pout
Output power
W
%
THD = 10% max, F = 1kHz, RL = 4Ω
THD = 1% max, F = 1kHz, RL = 8Ω
THD = 10% max, F = 1kHz, RL = 8Ω
Pout = 200mWRMS, G = 6dB, 20Hz < F< 20kHz
RL = 8Ω + 15µH, BW < 30kHz
Pout = 200WRMS, G = 6dB, F = 1kHz,
RL = 8Ω + 15µH, BW < 30kHz
Total harmonic
distortion + noise
1
THD + N
0.19
Pout = 0.47WRMS, RL = 4Ω + ≥ 15µH
Pout = 0.3WRMS, RL = 8Ω+ ≥ 15µH
78
88
Efficiency Efficiency
Power supply
%
F = 217Hz, RL = 8Ω, G=6dB,
Vripple = 200mVpp
PSRR rejection ratio with
60
54
dB
inputs grounded (2)
Common mode
CMRR
F = 217Hz, RL = 8Ω, G = 6dB,
ΔVicm = 200mVpp
dB
V/V
kΩ
rejection ratio
273kΩ
300kΩ
327kΩ
-----------------
-----------------
-----------------
Gain
RSTBY
FPWM
Gain value
Rin in kΩ
R
R
R
in
in
in
Internal resistance
from Standby to GND
273
180
300
250
327
320
Pulse width modulator
base frequency
kHz
SNR
tWU
Signal to noise ratio
Wake-up time
A-weighting, Pout = 1.2W, RL = 8Ω
80
5
dB
ms
ms
10
10
tSTBY
Standby time
5
13/41
Electrical characteristics
TS4962M
Table 8.
Symbol
V
= +2.5V, GND = 0V, V = 2.5V, T
= 25°C (unless otherwise specified)
CC
IC
amb
Parameter
Conditions
Min.
Typ.
Max.
Unit
F = 20Hz to 20kHz, G = 6dB
Unweighted RL = 4Ω
A-weighted RL = 4Ω
85
60
Unweighted RL = 8Ω
A-weighted RL = 8Ω
86
62
Unweighted RL = 4Ω + 15µH
A-weighted RL = 4Ω + 15µH
76
56
VN
Output Voltage Noise
μVRMS
Unweighted RL = 4Ω + 30µH
A-weighted RL = 4Ω + 30µH
82
60
Unweighted RL = 8Ω + 30µH
A-weighted RL = 8Ω + 30µH
67
53
Unweighted RL = 4Ω + Filter
A-weighted RL = 4Ω + Filter
78
57
Unweighted RL = 4Ω + Filter
A-weighted RL = 4Ω + Filter
74
54
1. Standby mode is active when VSTBY is tied to GND.
2. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the superimposed sinusoidal signal to VCC @ F = 217Hz.
14/41
TS4962M
Electrical characteristics
Table 9.
Symbol
V
= +2.4V, GND = 0V, V = 2.5V, T
= 25°C (unless otherwise specified)
CC
IC
amb
Parameter
Conditions
No input signal, no load
No input signal, VSTBY = GND
Min.
Typ.
Max.
Unit
ICC
ISTBY
VOO
Supply current
1.7
10
3
mA
nA
Standby current (1)
Output offset voltage No input signal, RL = 8Ω
mV
G=6dB
THD = 1% max, F = 1kHz, RL = 4Ω
0.48
0.65
0.3
Pout
Output power
W
THD = 10% max, F = 1kHz, RL = 4Ω
THD = 1% max, F = 1kHz, RL = 8Ω
THD = 10% max, F = 1kHz, RL = 8Ω
0.38
Total harmonic
distortion + noise
P
out = 200mWRMS, G = 6dB, 20Hz < F< 20kHz
1
THD + N
%
%
RL = 8Ω + 15µH, BW < 30kHz
Pout = 0.38WRMS, RL = 4Ω + ≥ 15µH
Pout = 0.25WRMS, RL = 8Ω+ ≥ 15µH
77
86
Efficiency Efficiency
Common mode
rejection ratio
F = 217Hz, RL = 8Ω, G = 6dB,
ΔVicm = 200mVpp
CMRR
Gain
54
dB
V/V
kΩ
kHz
273kΩ
300kΩ
327kΩ
-----------------
-----------------
-----------------
Gain value
R
in in kΩ
R
R
R
in
in
in
Internal resistance
from Standby to GND
RSTBY
FPWM
273
300
250
327
Pulse width modulator
base frequency
SNR
tWU
Signal to noise ratio
Wake-up time
A Weighting, Pout = 1.2W, RL = 8Ω
80
5
dB
ms
ms
tSTBY
Standby time
5
F = 20Hz to 20kHz, G = 6dB
Unweighted RL = 4Ω
A-weighted RL = 4Ω
85
60
Unweighted RL = 8Ω
A-weighted RL = 8Ω
86
62
Unweighted RL = 4Ω + 15µH
A-weighted RL = 4Ω + 15µH
76
56
VN
Output voltage noise
μVRMS
Unweighted RL = 4Ω + 30µH
A-weighted RL = 4Ω + 30µH
82
60
Unweighted RL = 8Ω + 30µH
A-weighted RL = 8Ω + 30µH
67
53
Unweighted RL = 4Ω + Filter
A-weighted RL = 4Ω + Filter
78
57
Unweighted RL = 4Ω + Filter
A-weighted RL = 4Ω + Filter
74
54
1. Standby mode is active when VSTBY is tied to GND.
15/41
Electrical characteristic curves
TS4962M
4
Electrical characteristic curves
The graphs included in this section use the following abbreviations:
●
●
●
R + 15μH or 30μH = pure resistor + very low series resistance inductor
Filter = LC output filter (1µF+30µH for 4Ω and 0.5µF+60µH for 8Ω)
L
All measurements done with C =1µF and C =100nF except for PSRR where Cs1 is
s1
s2
removed.
Figure 2.
Test diagram for measurements
Vcc
1uF
Cs1
100nF
Cs2
+
GND GND
In+
Cin
Cin
Rin
Out+
4 or 8 Ohms
RL
15uH or 30uH
5th order
50kHz low pass
filter
150k
TS4962
or
Rin
LC Filter
In-
Out-
150k
GND
Audio Measurement
Bandwidth < 30kHz
Figure 3.
Test diagram for PSRR measurements
100nF
Cs2
20Hz to 20kHz
Vcc
GND
GND
4.7uF
Rin
Out+
In+
4 or 8 Ohms
RL
15uH or 30uH
5th order
50kHz low pass
filter
150k
TS4962
or
4.7uF
Rin
LC Filter
In-
Out-
150k
GND
GND
5th order
50kHz low pass
filter
RMS Selective Measurement
Bandwidth=1% of Fmeas
Reference
16/41
TS4962M
Figure 4.
Electrical characteristic curves
Current consumption vs. power
supply voltage
Figure 5.
Current consumption vs. standby
voltage
2.5
2.0
1.5
1.0
0.5
0.0
2.5
2.0
1.5
1.0
0.5
0.0
No load
Tamb=25
°
C
Vcc = 5V
No load
Tamb=25
°C
0
1
2
3
4
5
0
1
2
3
4
5
Standby Voltage (V)
Power Supply Voltage (V)
Figure 6.
Current consumption vs. standby Figure 7.
voltage
Output offset voltage vs. common
mode input voltage
2.0
1.5
1.0
0.5
0.0
10
8
G = 6dB
Tamb = 25°C
6
Vcc=5V
Vcc=3.6V
4
2
Vcc = 3V
No load
Tamb=25
Vcc=2.5V
°C
0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
0.0
0.5
1.0
1.5
2.0
2.5 3.0
Common Mode Input Voltage (V)
Standby Voltage (V)
Figure 8.
Efficiency vs. output power
Figure 9.
Efficiency vs. output power
100
80
60
40
20
100
80
60
40
20
0
200
150
100
50
600
500
400
300
200
100
0
Efficiency
Efficiency
Power
Dissipation
Power
Dissipation
Vcc=5V
RL=4
F=1kHz
THD+N
Vcc=3V
RL=4Ω + ≥ 15μH
F=1kHz
Ω
+
≥
15
μ
H
THD+N≤1%
≤1%
0
0
0.0
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.5
1.0
1.5
2.0
2.3
Output Power (W)
Output Power (W)
17/41
Electrical characteristic curves
TS4962M
Figure 10. Efficiency vs. output power
Figure 11. Efficiency vs. output power
100
75
50
25
100
150
100
50
80
80
Efficiency
Efficiency
60
40
60
40
Power
Dissipation
Power
Vcc=3V
Vcc=5V
RL=8
F=1kHz
Dissipation
20
20
Ω
+
≥
15μH
RL=8Ω
+
≥
15μH
F=1kHz
THD+N
≤
1%
THD+N
≤1%
0
0.0
0
1.4
0
0.0
0
0.2
0.4
0.6
0.8
1.0
1.2
0.1
0.2
0.3
0.4
0.5
Output Power (W)
Output Power (W)
Figure 12. Output power vs. power supply
voltage
Figure 13. Output power vs. power supply
voltage
2.0
3.5
RL = 4Ω + ≥ 15μH
RL = 8
F = 1kHz
BW < 30kHz
Ω + ≥ 15μH
F = 1kHz
BW < 30kHz
Tamb = 25
THD+N=10%
3.0
2.5
2.0
1.5
1.0
0.5
0.0
°C
1.5
1.0
0.5
0.0
Tamb = 25
°C
THD+N=10%
THD+N=1%
THD+N=1%
4.5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
2.5
3.0
3.5
4.0
5.0
5.5
Vcc (V)
Vcc (V)
Figure 14. PSRR vs. frequency
Figure 15. PSRR vs. frequency
0
0
Vripple = 200mVpp
Inputs = Grounded
Vripple = 200mVpp
Inputs = Grounded
-10
-10
G = 6dB, Cin = 4.7
RL = 4 + 30
R/R 0.1%
Tamb = 25
μF
G = 6dB, Cin = 4.7
RL = 4 + 15
R/R 0.1%
Tamb = 25
μF
-20
-30
-40
-50
-60
-70
-80
-20
-30
-40
-50
-60
-70
-80
Ω
μH
Ω
μH
Δ
≤
Δ
≤
°
C
°
C
Vcc=5V, 3.6V, 2.5V
Vcc=5V, 3.6V, 2.5V
20
100
1000
Frequency (Hz)
10000 20k
20
100
1000
Frequency (Hz)
10000 20k
18/41
TS4962M
Electrical characteristic curves
Figure 16. PSRR vs. frequency
Figure 17. PSRR vs. frequency
0
0
-10
-20
-30
-40
-50
-60
-70
-80
Vripple = 200mVpp
Inputs = Grounded
Vripple = 200mVpp
Inputs = Grounded
-10
G = 6dB, Cin = 4.7
RL = 4 + Filter
R/R 0.1%
Tamb = 25
μF
G = 6dB, Cin = 4.7
RL = 8 + 15
R/R 0.1%
Tamb = 25
μF
-20
-30
-40
-50
-60
-70
-80
Ω
Ω
μH
Δ
≤
Δ
≤
°C
°C
Vcc=5V, 3.6V, 2.5V
Vcc=5V, 3.6V, 2.5V
20
20
100
1000
10000
20k
100
1000
10000 20k
Frequency (Hz)
Frequency (Hz)
Figure 18. PSRR vs. frequency
Figure 19. PSRR vs. frequency
0
0
Vripple = 200mVpp
Inputs = Grounded
Vripple = 200mVpp
Inputs = Grounded
-10
-10
G = 6dB, Cin = 4.7
RL = 8 + 30
R/R 0.1%
Tamb = 25
μF
G = 6dB, Cin = 4.7
R/R 0.1%
RL = 8 + Filter
Tamb = 25
μF
-20
-30
-40
-50
-60
-70
-80
-20
-30
-40
-50
-60
-70
-80
Ω
μH
Δ
≤
Δ
≤
Ω
°
C
°C
Vcc=5V, 3.6V, 2.5V
Vcc=5V, 3.6V, 2.5V
20
100
1000
Frequency (Hz)
10000 20k
20
100
1000
Frequency (Hz)
10000 20k
Figure 20. PSRR vs. common mode input
voltage
Figure 21. CMRR vs. frequency
0
0
Vripple = 200mVpp
F = 217Hz, G = 6dB
RL=4
G=6dB
Ω + 15μH
-10
RL
≥ 4Ω + ≥ 15μH
Δ
Δ
Vicm=200mVpp
R/R 0.1%
Vcc=2.5V
-20
-30
-40
-50
-60
-70
-80
Tamb = 25
°C
≤
-20
-40
-60
Cin=4.7
Tamb = 25
μF
°C
Vcc=3.6V
Vcc=5V, 3.6V, 2.5V
Vcc=5V
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
20
100
1000
10000 20k
Frequency (Hz)
Common Mode Input Voltage (V)
19/41
Electrical characteristic curves
TS4962M
Figure 22. CMRR vs. frequency
Figure 23. CMRR vs. frequency
0
0
RL=4
G=6dB
Ω + 30μH
RL=4
G=6dB
Ω + Filter
Δ
Δ
Vicm=200mVpp
R/R 0.1%
Δ
Δ
Vicm=200mVpp
R/R 0.1%
-20
-40
-60
≤
-20
-40
-60
≤
Cin=4.7
Tamb = 25
μF
Cin=4.7
Tamb = 25
μF
°C
°C
Vcc=5V, 3.6V, 2.5V
Vcc=5V, 3.6V, 2.5V
20
100
1000
10000 20k
20
100
1000
10000 20k
Frequency (Hz)
Frequency (Hz)
Figure 24. CMRR vs. frequency
Figure 25. CMRR vs. frequency
0
0
RL=8
G=6dB
Ω + 15μH
RL=8
G=6dB
Ω + 30μH
Δ
Δ
Vicm=200mVpp
R/R 0.1%
Δ
Δ
Vicm=200mVpp
R/R 0.1%
-20
-40
-60
≤
-20
-40
-60
≤
Cin=4.7
Tamb = 25
μF
Cin=4.7
Tamb = 25
μF
°C
°C
Vcc=5V, 3.6V, 2.5V
Vcc=5V, 3.6V, 2.5V
20
100
1000
Frequency (Hz)
10000 20k
20
100
1000
Frequency (Hz)
10000 20k
Figure 26. CMRR vs. frequency
Figure 27. CMRR vs. common mode input
voltage
-20
0
Δ
Vicm = 200mVpp
RL=8
G=6dB
Ω + Filter
F = 217Hz
-30
-40
-50
-60
-70
G = 6dB
Δ
Δ
Vicm=200mVpp
R/R 0.1%
Vcc=2.5V
RL
≥ 4Ω + ≥ 15μH
-20
-40
-60
≤
Tamb = 25
°C
Cin=4.7
Tamb = 25
μF
°C
Vcc=3.6V
Vcc=5V, 3.6V, 2.5V
Vcc=5V
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
20
100
1000
10000 20k
Frequency (Hz)
Common Mode Input Voltage (V)
20/41
TS4962M
Electrical characteristic curves
Figure 28. THD+N vs. output power
Figure 29. THD+N vs. output power
10
10
Vcc=5V
RL = 4
F = 100Hz
G = 6dB
BW < 30kHz
Tamb = 25°C
Ω + 15μH
RL = 4
F = 100Hz
G = 6dB
BW < 30kHz
Tamb = 25°C
Ω + 30μH or Filter
Vcc=5V
Vcc=3.6V
Vcc=2.5V
Vcc=3.6V
Vcc=2.5V
1
1
0.1
0.1
1E-3
0.01
0.1
1
3
1E-3
0.01
0.1
1
3
Output Power (W)
Output Power (W)
Figure 30. THD+N vs. output power
Figure 31. THD+N vs. output power
10
10
RL = 8
F = 100Hz
G = 6dB
BW < 30kHz
Ω + 15μH
RL = 8
F = 100Hz
G = 6dB
Ω + 30μH or Filter
Vcc=5V
Vcc=5V
Vcc=3.6V
Vcc=3.6V
BW < 30kHz
Vcc=2.5V
Tamb = 25°C
Tamb = 25°C
Vcc=2.5V
1
1
0.1
0.1
1E-3
0.01
0.1
1
2
1E-3
0.01
0.1
1
2
Output Power (W)
Output Power (W)
Figure 32. THD+N vs. output power
Figure 33. THD+N vs. output power
10
10
RL = 4
F = 1kHz
G = 6dB
BW < 30kHz
Tamb = 25
Ω + 15μH
Vcc=5V
RL = 4
F = 1kHz
G = 6dB
BW < 30kHz
Tamb = 25
Ω + 30μH or Filter
Vcc=5V
Vcc=3.6V
Vcc=2.5V
Vcc=3.6V
Vcc=2.5V
°C
°C
1
1
0.1
1E-3
0.1
1E-3
0.01
0.1
1
3
0.01
0.1
1
3
Output Power (W)
Output Power (W)
21/41
Electrical characteristic curves
TS4962M
Figure 34. THD+N vs. output power
Figure 35. THD+N vs. output power
10
10
RL = 8
F = 1kHz
G = 6dB
Ω + 15μH
RL = 8
F = 1kHz
G = 6dB
Ω + 30μH or Filter
Vcc=5V
Vcc=5V
BW < 30kHz
Tamb = 25
BW < 30kHz
Tamb = 25°C
Vcc=3.6V
Vcc=3.6V
°
C
Vcc=2.5V
Vcc=2.5V
1
1
0.1
1E-3
0.1
1E-3
0.01
0.1
1
2
0.01
0.1
1
2
Output Power (W)
Output Power (W)
Figure 36. THD+N vs. frequency
Figure 37. THD+N vs. frequency
10
10
RL=4
G=6dB
Ω + 30μH or Filter
RL=4
G=6dB
Ω + 15μH
Bw < 30kHz
Vcc=5V
Tamb = 25°C
Bw < 30kHz
Vcc=5V
Tamb = 25°C
Po=1.5W
Po=1.5W
1
1
Po=0.75W
0.1
Po=0.75W
0.1
50 100
1000
Frequency (Hz)
10000 20k
50 100
1000
Frequency (Hz)
10000 20k
Figure 38. THD+N vs. frequency
Figure 39. THD+N vs. frequency
10
10
RL=4
G=6dB
Ω + 15μH
RL=4
G=6dB
Ω + 30μH or Filter
Bw < 30kHz
Vcc=3.6V
Tamb = 25°C
Bw < 30kHz
Vcc=3.6V
Tamb = 25°C
Po=0.9W
Po=0.9W
1
1
Po=0.45W
Po=0.45W
0.1
0.1
50 100
1000
Frequency (Hz)
10000 20k
50 100
1000
Frequency (Hz)
10000 20k
22/41
TS4962M
Electrical characteristic curves
Figure 40. THD+N vs. frequency
Figure 41. THD+N vs. frequency
10
10
RL=4
G=6dB
Ω + 30μH or Filter
RL=4
G=6dB
Ω + 15μH
Bw < 30kHz
Vcc=2.5V
Tamb = 25°C
Bw < 30kHz
Vcc=2.5V
Tamb = 25°C
Po=0.4W
Po=0.4W
1
1
Po=0.2W
Po=0.2W
0.1
0.1
200
1000
Frequency (Hz)
10000
20k
50 100
1000
Frequency (Hz)
10000 20k
10000 20k
10000 20k
Figure 42. THD+N vs. frequency
Figure 43. THD+N vs. frequency
10
10
RL=8
G=6dB
Bw < 30kHz
Vcc=5V
Tamb = 25°C
Ω + 15μH
RL=8Ω + 30μH or Filter
G=6dB
Bw < 30kHz
Vcc=5V
Tamb = 25°C
Po=0.9W
Po=0.9W
1
1
Po=0.45W
0.1
0.1
Po=0.45W
50 100
1000
Frequency (Hz)
50 100
1000
Frequency (Hz)
10000 20k
Figure 44. THD+N vs. frequency
Figure 45. THD+N vs. frequency
10
10
RL=8
G=6dB
Bw < 30kHz
Vcc=3.6V
Tamb = 25°C
Ω + 15μH
RL=8Ω + 30μH or Filter
G=6dB
Bw < 30kHz
Vcc=3.6V
Tamb = 25°C
Po=0.5W
Po=0.5W
1
1
0.1
0.1
Po=0.25W
Po=0.25W
50 100
1000
Frequency (Hz)
50 100
1000
Frequency (Hz)
10000 20k
23/41
Electrical characteristic curves
TS4962M
Figure 46. THD+N vs. frequency
Figure 47. THD+N vs. frequency
10
10
RL=8Ω + 30μH or Filter
RL=8Ω + 15μH
G=6dB
G=6dB
Bw < 30kHz
Vcc=2.5V
Tamb = 25°C
Bw < 30kHz
Vcc=2.5V
Po=0.2W
Po=0.2W
1
0.1
1
0.1
Tamb = 25
°C
Po=0.1W
Po=0.1W
0.01
0.01
50 100
1000
Frequency (Hz)
10000 20k
50 100
1000
Frequency (Hz)
10000 20k
Figure 48. Gain vs. frequency
Figure 49. Gain vs. frequency
8
8
6
6
Vcc=5V, 3.6V, 2.5V
4
Vcc=5V, 3.6V, 2.5V
4
RL=4
G=6dB
Vin=500mVpp
Cin=1
Tamb = 25
Ω + 30μH
RL=4
G=6dB
Vin=500mVpp
Cin=1
Tamb = 25
Ω + 15μH
2
0
2
0
μF
μF
°C
°C
20
100
1000
10000 20k
20
100
1000
10000 20k
Frequency (Hz)
Frequency (Hz)
Figure 50. Gain vs. frequency
Figure 51. Gain vs. frequency
8
8
6
6
Vcc=5V, 3.6V, 2.5V
4
Vcc=5V, 3.6V, 2.5V
4
RL=8
G=6dB
Vin=500mVpp
Cin=1
Tamb = 25
Ω + 15μH
RL=4
G=6dB
Vin=500mVpp
Cin=1
Tamb = 25
Ω + Filter
2
0
2
0
μF
μF
°C
°C
20
100
1000
10000 20k
20
100
1000
10000 20k
Frequency (Hz)
Frequency (Hz)
24/41
TS4962M
Electrical characteristic curves
Figure 52. Gain vs. frequency
Figure 53. Gain vs. frequency
8
8
6
4
2
0
6
Vcc=5V, 3.6V, 2.5V
4
Vcc=5V, 3.6V, 2.5V
RL=8
G=6dB
Vin=500mVpp
Cin=1
Tamb = 25
Ω + Filter
RL=8
G=6dB
Vin=500mVpp
Cin=1
Tamb = 25
Ω + 30μH
2
0
μF
μF
°C
°C
20
100
1000
10000 20k
20
100
1000
10000 20k
Frequency (Hz)
Frequency (Hz)
Figure 54. Gain vs. frequency
Figure 55. Startup & shutdown time
= 5V, G = 6dB, C = 1µF
V
CC
in
(5ms/div)
8
Vo1
Vo2
6
Vcc=5V, 3.6V, 2.5V
4
Standby
RL=No Load
G=6dB
Vo1-Vo2
2
Vin=500mVpp
Cin=1μF
Tamb = 25
°C
0
20
100
1000
10000 20k
Frequency (Hz)
25/41
Electrical characteristic curves
TS4962M
Figure 56. Startup & shutdown time
Figure 57. Startup & shutdown time
= 5V, G = 6dB, C = 100nF
V
= 3V, G = 6dB, C = 1µF
V
CC
CC
in
in
(5ms/div)
(5ms/div)
Vo1
Vo2
Vo1
Vo2
Standby
Standby
Vo1-Vo2
Vo1-Vo2
Figure 58. Startup & shutdown time
= 3V, G = 6dB, C = 100nF
Figure 59. Startup & shutdown time
V
V
= 5V, G = 6dB, No C (5ms/div)
CC
in
CC
in
(5ms/div)
Vo1
Vo2
Vo1
Vo2
Standby
Standby
Vo1-Vo2
Vo1-Vo2
26/41
TS4962M
Electrical characteristic curves
Figure 60. Startup & shutdown time
V
= 3V, G = 6dB, No C (5ms/div)
CC
in
Vo1
Vo2
Standby
Vo1-Vo2
27/41
Application information
TS4962M
5
Application information
5.1
Differential configuration principle
The TS4962M is a monolithic fully-differential input/output class D power amplifier. The
TS4962M also includes a common-mode feedback loop that controls the output bias value
to average it at V /2 for any DC common mode input voltage. This allows the device to
CC
always have a maximum output voltage swing, and by consequence, maximizes the output
power. Moreover, as the load is connected differentially compared to a single-ended
topology, the output is four times higher for the same power supply voltage.
The advantages of a full-differential amplifier are:
●
●
●
High PSRR (power supply rejection ratio).
High common mode noise rejection.
Virtually zero pop without additional circuitry, giving a faster start-up time compared to
conventional single-ended input amplifiers.
●
●
Easier interfacing with differential output audio DAC.
No input coupling capacitors required due to common mode feedback loop.
The main disadvantage is:
●
As the differential function is directly linked to external resistor mismatching, paying
particular attention to this mismatching is mandatory in order to obtain the best
performance from the amplifier.
5.2
Gain in typical application schematic
Typical differential applications are shown in Figure 1 on page 4.
In the flat region of the frequency-response curve (no input coupling capacitor effect), the
differential gain is expressed by the relation:
Out+ – Out-
In+ – In-
300
Rin
AV = ------------------------------ = ---------
diff
with R expressed in kΩ.
in
Due to the tolerance of the internal 150kΩ feedback resistor, the differential gain will be in
the range (no tolerance on R ):
in
273
Rin
327
Rin
---------
---------
≤
≤ AV
diff
28/41
TS4962M
Application information
5.3
Common mode feedback loop limitations
As explained previously, the common mode feedback loop allows the output DC bias voltage
to be averaged at V /2 for any DC common mode bias input voltage.
CC
However, due to V
limitation in the input stage (see Table 2: Operating conditions on
icm
page 3), the common mode feedback loop can ensure its role only within a defined range.
This range depends upon the values of V and R (A ). To have a good estimation of
CC
in
Vdiff
the V
value, we can apply this formula (no tolerance on R ):
icm
in
VCC × Rin + 2 × VIC × 150kΩ
-----------------------------------------------------------------------------
Vicm
=
(V)
2 × (Rin + 150kΩ)
with
In+ + In-
---------------------
VIC
=
(V)
2
and the result of the calculation must be in the range:
0.5V ≤ Vicm ≤ VCC – 0.8V
Due to the +/-9% tolerance on the 150kΩ resistor, it’s also important to check V
conditions:
in these
icm
VCC × Rin + 2 × VIC × 136.5kΩ
----------------------------------------------------------------------------------
2 × (Rin + 136.5kΩ)
VCC × Rin + 2 × VIC × 163.5kΩ
----------------------------------------------------------------------------------
2 × (Rin + 163.5kΩ)
≤ Vicm
≤
If the result of V
calculation is not in the previous range, input coupling capacitors must
icm
be used (with V from 2.4V to 2.5V, input coupling capacitors are mandatory).
CC
For example:
With V = 3V, R = 150k and V = 2.5V, we typically find V = 2V and this is lower than
CC
in
IC
icm
3V - 0.8V = 2.2V. With 136.5kΩwe find 1.97V, and with 163.5kΩwe have 2.02V. So, no input
coupling capacitors are required.
5.4
Low frequency response
If a low frequency bandwidth limitation is requested, it is possible to use input coupling
capacitors.
In the low frequency region, C (input coupling capacitor) starts to have an effect. C forms,
in
in
with R , a first order high-pass filter with a -3dB cut-off frequency:
in
1
-------------------------------------
FCL
=
(Hz)
(F)
2π × Rin × Cin
So, for a desired cut-off frequency we can calculate C ,
in
1
---------------------------------------
Cin
=
2π × Rin × FCL
with R in Ω and F in Hz.
in
CL
29/41
Application information
TS4962M
5.5
Decoupling of the circuit
A power supply capacitor, referred to as C is needed to correctly bypass the TS4962M.
S,
The TS4962M has a typical switching frequency at 250kHz and output fall and rise time
about 5ns. Due to these very fast transients, careful decoupling is mandatory.
A 1µF ceramic capacitor is enough, but it must be located very close to the TS4962M in
order to avoid any extra parasitic inductance created an overly long track wire. In relation
with dI/dt, this parasitic inductance introduces an overvoltage that decreases the global
efficiency and, if it is too high, may cause a breakdown of the device.
In addition, even if a ceramic capacitor has an adequate high frequency ESR value, its
current capability is also important. A 0603 size is a good compromise, particularly when a
4Ω load is used.
Another important parameter is the rated voltage of the capacitor. A 1µF/6.3V capacitor
used at 5V, loses about 50% of its value. In fact, with a 5V power supply voltage, the
decoupling value is about 0.5µF instead of 1µF. As C has particular influence on the
S
THD+N in the medium-high frequency region, this capacitor variation becomes decisive. In
addition, less decoupling means higher overshoots, which can be problematic if they reach
the power supply AMR value (6V).
5.6
5.7
5.8
Wake-up time (tWU)
When the standby is released to set the device ON, there is a wait of about 5ms. The
TS4962M has an internal digital delay that mutes the outputs and releases them after this
time in order to avoid any pop noise.
Shutdown time (tSTBY
)
When the standby command is set, the time required to put the two output stages into high
impedance and to put the internal circuitry in shutdown mode, is about 5ms. This time is
used to decrease the gain and avoid any pop noise during shutdown.
Consumption in shutdown mode
Between the shutdown pin and GND there is an internal 300kΩresistor. This resistor forces
the TS4962M to be in standby mode when the standby input pin is left floating.
However, this resistor also introduces additional power consumption if the shutdown pin
voltage is not 0V.
For example, with a 0.4V standby voltage pin, Table 2: Operating conditions on page 3,
shows that you must add 0.4V/300kΩ= 1.3µA in typical (0.4V/273kΩ= 1.46µA in maximum)
to the shutdown current specified in Table 4 on page 5.
5.9
Single-ended input configuration
It is possible to use the TS4962M in a single-ended input configuration. However, input
coupling capacitors are needed in this configuration. The schematic in Figure 61 shows a
single-ended input typical application.
30/41
TS4962M
Application information
Figure 61. Single-ended input typical application
Vcc
Cs
1u
B1
B2
Vcc
Ve
Stdby
C2
Internal
Bias
Standby
Rin
GND
Out+
150k
C3
A3
Cin
GND
C1
A1
Output
-
In-
In+
H
PWM
+
Bridge
SPEAKER
Rin
Cin
150k
Oscillator
Out-
GND
GND
A2
TS4962
B3
GND
All formulas are identical except for the gain (with R in kΩ) :
in
Ve
300
Rin
AV
= ------------------------------ = ---------
single
Out+ – Out-
And, due to the internal resistor tolerance we have:
273
Rin
327
---------
≤
---------
≤ AV
single
Rin
In the event that multiple single-ended inputs are summed, it is important that the
-
+
impedance on both TS4962M inputs (In and In ) are equal.
Figure 62. Typical application schematic with multiple single-ended inputs
Vcc
Vek
Standby
Cs
1u
B1
B2
Vcc
Cink
Stdby
Rink
C2
Internal
Bias
GND
Ve1
Out+
GND
150k
C3
A3
Cin1
Rin1
C1
A1
Output
H
-
In-
In+
PWM
+
Bridge
SPEAKER
Req
GND
Ceq
150k
Oscillator
Out-
GND
GND
A2
TS4962
B3
GND
31/41
Application information
TS4962M
We have the following equations:
+
-
300
300
------------
------------
Out – Out = V
×
+ …+ V
×
ek
(V)
e1
k
R
R
in1
ink
C
=
C
Σ
eq
inj
j=1
1
C
= ------------------------------------------------------
(F)
inj
2 × π× R × F
inj
CLj
1
Req = -------------------
k
1
---------
∑
R
inj
j =1
In general, for mixed situations (single-ended and differential inputs), it is best to use the
same rule, that is, to equalize impedance on both TS4962M inputs.
5.10
Output filter considerations
The TS4962M is designed to operate without an output filter. However, due to very sharp
transients on the TS4962M output, EMI radiated emissions may cause some standard
compliance issues.
These EMI standard compliance issues can appear if the distance between the TS4962M
outputs and loudspeaker terminal is long (typically more than 50mm, or 100mm in both
directions, to the speaker terminals). As the PCB layout and internal equipment device are
different for each configuration, it is difficult to provide a one-size-fits-all solution.
However, to decrease the probability of EMI issues, there are several simple rules to follow:
●
Reduce, as much as possible, the distance between the TS4962M output pins and the
speaker terminals.
●
●
Use ground planes for “shielding” sensitive wires.
Place, as close as possible to the TS4962M and in series with each output, a ferrite
bead with a rated current at minimum 2A and impedance greater than 50Ω at
frequencies above 30MHz. If, after testing, these ferrite beads are not necessary,
replace them by a short-circuit. Murata BLM18EG221SN1 or BLM18EG121SN1 are
possible examples of devices you can use.
●
Allow enough footprint to place, if necessary, a capacitor to short perturbations to
ground (see the schematics in Figure 63).
Figure 63. Method for shorting pertubations to ground
Ferrite chip bead
To speaker
about 100pF
From TS4962 output
Gnd
32/41
TS4962M
Application information
In the case where the distance between the TS4962M outputs and speaker terminals is
high, it is possible to have low frequency EMI issues due to the fact that the typical operating
frequency is 250kHz. In this configuration, we recommend using an output filter (as shown
in Figure 1: Typical application schematics on page 4). It should be placed as close as
possible to the device.
5.11
Different examples with summed inputs
Example 1: Dual differential inputs
Figure 64. Typical application schematic with dual differential inputs
Vcc
Standby
Cs
1u
B1
B2
Vcc
Stdby
C2
Internal
Bias
R2
R1
E2+
Out+
GND
150k
C3
A3
C1
A1
Output
H
-
E1+
E1-
In-
In+
PWM
+
Bridge
SPEAKER
R1
R2
150k
Oscillator
E2-
Out-
GND
A2
TS4962
B3
GND
With (R in kΩ):
i
Out+ – Out-
E1+ – E1
300
R1
AV = ------------------------------ = ---------
1
-
Out+ – Out-
E2+ – E2
300
R2
AV = ------------------------------ = ---------
2
-
VCC × R1 × R2 + 300 × (VIC1 × R2 + VIC2 × R1)
-------------------------------------------------------------------------------------------------------------------------------
300 × (R1 + R2) + 2 × R1 × R2
0.5V ≤
≤ VCC – 0.8V
-
-
E1+ + E1
E2+ + E2
VIC = ------------------------ and VIC = ------------------------
1
2
2
2
33/41
Application information
TS4962M
Example 2: One differential input plus one single-ended input
Figure 65. Typical application schematic with one differential input plus one single-
ended input
Vcc
Standby
Cs
1u
B1
B2
Vcc
Stdby
C2
Internal
Bias
R2
R1
E2+
C1
Out+
GND
150k
C3
A3
C1
A1
Output
H
-
E1+
In-
In+
PWM
+
E2-
Bridge
SPEAKER
R2
150k
Oscillator
Out-
R1
GND C1
GND
A2
TS4962
B3
GND
With (R in kΩ):
i
Out+ – Out-
300
R1
AV = ------------------------------ = ---------
1
+
E1
Out+ – Out-
E2+ – E2
300
R2
AV = ------------------------------ = ---------
2
-
1
--------------------------------------
C1
=
(F)
2π × R1 × FCL
34/41
TS4962M
Demoboard
6
Demoboard
A demoboard for the TS4962M is available with a flip-chip to DIP adapter. For more
information about this demoboard, refer to Application Note AN2134.
Figure 66. Schematic diagram of mono class D demoboard for TS4962M
Vcc
Vcc
Cn1 + J1
+
1
2
3
Cn2
C1
2.2uF/10V
GND
GND
GND
Vcc
Cn4 + J2
3
8
U1
6
Vcc
Stdby
4
Internal
Bias
C2
Out+
R1
150k
Cn3
Cn6
5
1
Output
H
150k
-
Positive Input
Negative input
100nF
100nF
Positive Output
Negative Output
In-
In+
PWM
+
Bridge
R2
10
150k
Oscillator
150k
C3
Out-
GND
TS4962 Flip-Chip to DIP Adapter
2
3
Cn5 + J3
GND
Figure 67. Diagram for flip-chip-to-DIP adapter
R1
+
C2
1uF
OR
C1
100nF
B1
B2
Vcc
Stdby
C2
Internal
Bias
Pin4
Out+
150k
C3
A3
Pin6
C1
A1
Output
-
Pin5
Pin1
In-
In+
H
PWM
+
Bridge
Pin10
150k
Oscillator
Out-
GND
TS4962
A2
B3
R2
OR
35/41
Demoboard
TS4962M
Figure 68. Top view
Figure 69. Bottom layer
Figure 70. Top layer
36/41
TS4962M
Footprint recommendations
7
Footprint recommendations
Figure 71. Footprint recommendations
75µm min.
100μm max.
500μm
500μm
Φ=250μm
Track
Φ=400μm typ.
Φ=340μm min.
150μm min.
Non Solder mask opening
Pad in Cu 18μm with Flash NiAu (2-6μm, 0.2μm max.)
37/41
Package information
TS4962M
8
Package information
In order to meet environmental requirements, STMicroelectronics offers these devices in
®
ECOPACK packages. These packages have a lead-free second level interconnect. The
category of second level interconnect is marked on the package and on the inner box label,
in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an STMicroelectronics
trademark. ECOPACK specifications are available at: www.st.com.
Figure 72. Pin-out for 9-bump flip-chip (top view)
GND
2/A2
IN+
OUT-
3/A3
1/A1
■ Bumps are underneath
■ Bump diameter = 300μm
VDD
GND
6/B3
VDD
5/B2
4/B1
STBY
8/C2
OUT+
9/C3
IN-
7/C1
Figure 73. Marking for 9-bump flip-chip (top view)
■ ST Logo
■ Symbol for lead-free: E
E
■ Two first XX product code: 62
■ third X: Assembly code
■ Three digits date code: Y for year - WW for week
■ The dot is for marking pin A1
XXX
YWW
Figure 74. Mechanical data for 9-bump flip-chip
■
■
■
■
■
■
■
■
Die size: 1.6mm x 1.6mm ±±0μm
1.60 mm
Die height (including bumps): 600μm
Bump diameter: 315μm ±50μm
Bump diameter before reflow: 300μm ±10μm
Bump height: 250μm ±ꢀ0μm
Die height: 350μm ±ꢁ0μm
1.60 mm
0.5mm
0.5mm
Pitch: 500μm ±50μm
∅ 0.25mm
Coplanarity: 50μm max
600µm
38/41
TS4962M
Ordering information
9
Ordering information
Table 10. Order codes
Temperature
Part number
range
Package
Packing
Tape & reel
Marking
TS4962MEIJT
-40°C to +85°C
Lead-free flip-chip
62
39/41
Revision history
TS4962M
10
Revision history
Date
Revision
Changes
Oct. 2005
1
First release corresponding to the product preview version.
Electrical data updated for output voltage noise, see Table 4, Table 5,
Table 6, Table 7, Table 8 andTable 9
Nov. 2005
2
Formatting changes throughout.
Dec. 2005
3
4
Product in full production.
10-Jan-2007
Template update, no technical changes.
40/41
TS4962M
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