AN7199Z [PANASONIC]
Dual 20 W BTL power IC for car audio; 双20瓦BTL电源IC汽车音响
| 型号： | AN7199Z |
| 厂家： | 
PANASONIC |
| 描述： | Dual 20 W BTL power IC for car audio |
| 文件： | 总17页 (文件大小：132K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ICs for Audio Common Use
AN7199Z
Dual 20 W BTL power IC for car audio
■ Overview
Unit : mm
The AN7199Z is an audio power IC developed for the
sound output of car audio (dual 20 W).
18.00±0.30
13.50±0.30
4.00±0.20
1.50±0.10
A capacitor and a resistor to stop oscillation are built
in between the output pin and GND so that a space sav-
ing of set is possible. Also, it is incorporates an industry's
first superior muting circuit which is free from shock
noise, so that a shock noise design under the set transient
condition can be made easily when the muting circuit is
used together with its standby function.
In addition, it is incorporating various protective cir-
cuits to protect the IC from destruction by GND-open
short-circuit to GND and power supply surge which are
the most important subjects of power IC protection, and
the IC will largely contribute to a high reliability design
of equipment.
φ3.60±0.10
1
15
(0.61)
(1.80)
R0.55
(1.95)
0.25+–00..1055
0.50+–00..1200
1.27
(2.54)
19.00±0.30
19.30±0.30
HZIP015-P-0745A
■ Features
• Built-in various protection circuits (realizing high break-
down voltage against destruction)
Power supply surge breakdown voltage of 80 V or more
Ground open breakdown voltage of 16 V or more
• Built-in standby function (free from shock noise when
STB-on/off)
• Built-in muting function
Free from shock noise at mute-on/off
• Adapting attenuator method so that abnormal sound due
to waveform deformation is not generated
Attack time, recovery time of 50 ms or less
• Reduction in external components
No CR for oscillation stop is required
It eliminates the need for NF and BS electrolytic ca-
pacitors
Muting function is unneccesary
Power supply choke coil is unnecessary
• Provided with beep sound input pin
• High sound quality design
■ Applications
• Car audio
1
AN7199Z
ICs for Audio Common Use
■ Block Diagram
3
14
Ref.
Ch.1 GND
Ch.2 GND
4
13
Ch.1 Out (−)
Ch.2 Out (−)
Protection Cct.
Att.
Att.
Att.
2
15
Ch.1 Out (+)
Ch.2 Out (+)
Att.Con.
Att.
■ Pin Descriptions
Pin No.
Description
Pin No.
9
Description
Grounding (input)
Beep sound input
Ch.2 input
1
2
3
4
5
6
7
8
Power supply
Ch.1 output (+)
10
Grounding (output ch.1)
Ch.1 output (−)
Standby
11
12
Ripple filter
13
Ch.2 output (−)
Ch.1 input
14
Grounding (output ch.2)
Ch.2 output (+)
Muting
15
Grounding (sub)
■ Absolute Maximum Ratings
Parameter
Symbol
VCC
Vsurge
ICC
Rating
Unit
V
2
Supply voltage *
25
60
3
Peak supply voltage *
V
Supply current
9.0
A
4
Power dissipation *
PD
59
W
°C
°C
1
Operating ambient temperature *
Topr
−30 to +85
−55 to +150
1
Storage temperature *
Tstg
Note) 1 : All items are at T = 25°C, except for the operating ambient temperature and storage temperature.
*
a
2 : Without signal
3 : Time = 0.2 s
*
*
*
4 : T = 85°C
a
2
ICs for Audio Common Use
AN7199Z
■ Recommended Operating Range
Parameter
Supply voltage
Symbol
VCC
Range
Unit
8.0 to 18.0
V
■ Electrical Characteristics at VCC = 13.2 V, f = 1 kHz, Ta = 25°C
Parameter
Quiescent current
Symbol
ICQ
Conditions
VIN = 0 mV, RL = 4 Ω
VIN = 0 mV, RL = 4 Ω
Rg = 10 kΩ, RL = 4 Ω
VIN = 20 mV, RL = 4 Ω
Min
Typ Max Unit
120
1
250
10
mA
Standby current
ISTB
µA
1
Output noise voltage *
Voltage gain 1
VNO
0.18
40
0.5 mV[rms]
GV1
38
16
55
42
dB
%
Total harmonic distortion 1
Maximum output power 1
THD1 VIN = 20 mV, RL = 4 Ω
0.07
18.5
22.0
60
0.4
PO1
THD = 10%, RL = 4 Ω
VCC = 14.4 V, RL = 4 Ω
W
W
dB
1
Ripple rejection ratio *
RR
RL = 4 Ω, Rg = 10 kΩ,
Vr = 1 V[rms], fr = 1 kHz
Channel balance
CB
CT
VIN = 20 mV, RL = 4 Ω
0
1
dB
dB
1
*
Cross-talk
VIN = 20 mV, RL = 4 Ω,
Rg = 10 kΩ
60
79
Output offset voltage
VOff
MT
Zi
Rg = 10 kΩ, RL = 4 Ω
VO = 1 W, RL = 4 Ω
VIN = ± 0.3 VDC
−300
70
0
86
30
40
0.12
25
0
300
mV
dB
kΩ
dB
%
1
Muting effect *
Input impedance
24
36
42
Voltage gain 2
GV2
VIN = 20 mV, RL = 2 Ω
38
Total harmonic distortion 2
Maximum output power 2
THD2 VIN = 20 mV, RL = 2 Ω
0.5
PO2
VS
THD = 10%, RL = 2 Ω
16
W
2
*
Shock noise
RL = 4 Ω, Rg = 10 kΩ
−100
100 mV[p-0]
VSTB = on/off, 50 Hz HPF-on
Total harmonic distortion 3
THD3 VIN = 10 mV, fIN = 20 kHz
Rg = 10 kΩ, RL = ∞
0.10
0.5
%
Note) 1 : Measurement using a bandwidth 15 Hz to 30 kHz (12 dB/OCT) filter.
*
2 : For VSTB = on/off, change over the standby terminal by the voltages of 0 V and 5 V at the time shown below.
*
Standby terminal voltage
5 V
0 V
500 ms
500 ms
3
AN7199Z
ICs for Audio Common Use
■ Terminal Equivalent Circuits
Pin No.
Equivalent circuit
Description
Supply voltage pin
DC Voltage
1
13.2 V
Supply connection pin
2
Ch.1 output pin (+)
6.6 V
1
Pre-amp.
Drive circuit
Ch.1 positive-phase output pin
2
3
VREF = 6.3 V
Drive circuit
15 kΩ
AN7198Z : 600 Ω
AN7199Z : 300 Ω
3
4
GND (output)
0 V
Grounding pin for ch.1 output
Ch.1 output pin (−)
6.6 V
1
Pre-amp.
Drive circuit
Ch.1 inverted-phase output pin
4
3
VREF = 6.3 V
Drive circuit
15 kΩ
AN7198Z : 600 Ω
AN7199Z : 300 Ω
ꢀ
5
Standby control pin
5
10 kΩ
Standby changeover pin
Threshold voltage approx. 2.1 V
2 kΩ
6
Ch.1 input pin
0 mV to10 mV
6
Approx. Approx.
15 µA 15 µA
Ch.1 input signal applied pin
Input impedance 30 kΩ
200 Ω
30 kΩ
600 Ω
4
ICs for Audio Common Use
AN7199Z
■ Terminal Equivalent Circuits (continued)
Pin No.
Equivalent circuit
Description
Mute control pin
DC Voltage
7
7
Mute changeover pin
200 Ω
Threshold voltage approx. 2.1 V
8
9
GND (substrate)
0 V
0 V
Being connected with substrate only
GND (input)
Ground pin for input
Beep sound input pin
10
2.1 V
Rnf
Rnf
15 kΩ
VREF = 6.3 V
Beep sound signal input pin
2
Input impedance 15.3 kΩ
15 kΩ
15 kΩ
Rnf
7.8 kΩ
10
15
Rnf
15 kΩ
VREF = 6.3 V
Rnf AN7198Z : 600Ω
AN7199Z : 300Ω
11
Ch.2 input pin
0 mV to10 mV
11
Approx. Approx.
15 µA 15 µA
Ch. 2 input signal applied pin
Input impedance 30 kΩ
200 Ω
30 kΩ
600 Ω
12
Ripple filter pin
13.0 V
VCC
Output current 3 mA to 10 mA
15 kΩ
12
350 µA
1.7 mA
20 kΩ
5
AN7199Z
ICs for Audio Common Use
■ Terminal Equivalent Circuits (continued)
Pin No.
Equivalent circuit
Description
Ch.2 output pin (−)
DC Voltage
13
6.3 V
1
Pre-amp.
Drive circuit
Ch.2 inverted-phase output pin
13
15
VREF = 6.3 V
Drive circuit
15 kΩ
AN7198Z : 600 Ω
AN7199Z : 300 Ω
14
15
GND(output)
0 V
Grounding pin for ch.2 output
Ch.2 output pin (+)
6.3 V
1
Pre-amp.
Drive circuit
Ch.2 positive-phase output pin
14
15
VREF = 6.3 V
Drive circuit
15 kΩ
AN7198Z : 600 Ω
AN7199Z : 300 Ω
■ Usage Notes
1. Always attach an outside heat sink to use the chip. In addition, the outside heat sink must be fastened onto a
chassis for use.
2. Connect the cooling fin to GND potential.
3. Avoid short-circuit to VCC and short-circuit to GND, and load short-circuit. There is a danger of destruction under
a special condition.
4. The temperature protection circuit will be actuated at Tj = approx. 150°C, but it is automatically reset when the
chip temperature drops below the above set level.
5. The overvoltage protection circuit starts its operation at VCC = approx. 20 V.
6. Take into consideration the heat radiation design particularly when VCC is set high or when the load is 2 Ω.
7. When the beep sound function is not used, open the beep sound input pin (pin 10) or connect it to pin 9 with
around 0.01 µF capacitor.
8. Connect only pin 9 (ground, signal source) to the signal GND of the amplifier in the previous stage. The
characteristics such as distortion, etc. will be improved.
6
ICs for Audio Common Use
AN7199Z
■ Technical Information
[1] PD
Ta curves of HZIP015-P-0745A
PD
Ta
120
Infinity heat sink
Rth (j−c) = 1.1°C/W
Rth (j−a) = 68.3°C/W
113.6
100
80
1°C/W heat sink
2°C/W heat sink
60
59.5
40.3
40
3°C/W heat sink
5°C/W heat sink
30.5
20.5
20
10°C/W heat sink
11.3
Without heat sink
1.8
0
0
25
50
75
100
125
150
Ambient temperature Ta (°C)
[2] Main characteristics
PO
VCC
PC , ICC
PO
35
30
25
20
15
10
5
45
6
5
4
3
PC (RL = 2 Ω)
40
35
30
ICC (RL = 2 Ω)
ICC (RL = 4 Ω)
RL = 2 Ω
25
20
15
10
5
RL = 4 Ω
PC (RL = 4 Ω)
f = 1 kHz
2
1
0
VCC = 13.2 V
f = 1 kHz
400 Hz HPF
30 kHz LPF
Both ch. input
Rg = 10 kΩ
THD = 10%
RL = 2 Ω, 4 Ω
400 Hz HPF
30 kHz LPF
Both ch. input
Rg = 10 kΩ
0
0
0
10
15
20
25
0
20
5
5
10
15
Supply voltage VCC (V)
Output power (1-ch.) PO (W)
7
AN7199Z
ICs for Audio Common Use
■ Technical Information (continued)
[2] Main characteristics (continued)
PO, THD
VIN (RL = 4 Ω)
PO, THD
VIN (RL = 2 Ω)
100.00
10.00
1.00
10.00
1.00
0.10
0.01
100.00
10.00
1.00
10.00
1.00
0.10
0.01
THD 10 kHz
PO
THD 10 kHz
PO
THD 100 Hz
1 kHz
THD 100 Hz
1 kHz
VCC = 13.2 V
f = 1 kHz
RL = 4 Ω
400 Hz HPF
30 kHz LPF
Both ch. input
Rg = 10 kΩ
VCC = 13.2 V
f = 1 kHz
RL = 2 Ω
400 Hz HPF
30 kHz LPF
Both ch. input
Rg = 10 kΩ
0.10
0.10
1
10
100
1 000
1
10
100
1 000
Input voltage VIN (mV[rms])
Input power VIN (mV[rms])
GV, PO
f
THD
f
10.00
1.00
0.10
0.01
40
38
36
34
32
30
28
26
24
22
20
30
28
26
24
22
20
18
16
14
G
V (2, 4 Ω)
PO (2 Ω)
R
L = 2 Ω
PO (4 Ω)
V
CC = 13.2 V
PO = 1 W
R
L = 4 Ω
RL = 2 Ω, 4 Ω
400 Hz HPF
30 kHz LPF
Both ch. Input
Rg = 10 kΩ
V
CC = 13.2 V 400 Hz HPF
PO = 1 W
THD = 10% Both ch. input
RL = 2 Ω, 4 Ω Rg = 10 kΩ
30 kHz LPF
12
10
10
100
1 000
10 000
100 000
10
100
1 000
Frequency f (Hz)
10 000
100 000
Frequency f (Hz)
GV, THD
VCC
ICQ, ISTB
VCC
45
5
4.5
200
10
9
8
7
6
5
4
3
2
1
0
43
41
39
37
35
33
31
29
27
25
180
160
140
120
100
80
4
GV (RL = 4 Ω, 2 Ω)
3.5
3
ICQ
VIN = 40 mV[rms]
f = 1 kHz
2.5
2
RL = 2 Ω, 4 Ω
400 Hz HPF
30 kHz LPF
Both ch. input
Rg = 10 kΩ
1.5
1
60
RL = 4 Ω
Both ch. input
Rg = 10 kΩ
40
0.5
20
THD (RL = 4 Ω, 2 Ω)
10 15
ISTB
0
25
0
0
20
0
10
15
20
25
5
5
Supply voltage VCC (V)
Supply voltage VCC (V)
8
ICs for Audio Common Use
AN7199Z
■ Technical Information (continued)
[2] Main characteristics (continued)
VNO
VCC
VNO
Rg
1.0
0.5
0.0
1.0
0.5
0.0
VCC = 13.2 V
RL = 4 Ω
Rg = 10 kΩ
RL = 4 Ω
Rg = 10 kΩ
Flat
Flat
DIN Audio Filter
DIN Audio Filter
10
100
1 000
10 000
100 000
0
10
15
20
5
Supply voltage VCC (V)
Input impedance Rg (Ω)
RR
VCC
RR
Vr
90
80
70
60
50
40
30
20
70
60
50
40
30
20
10
0
ch.2
ch.1
ch.2
ch.1
RL = 4 Ω
VCC = 13.2 V
RL = 4 Ω
400 Hz HPF
30 kHz LPF
Rg = 10 kΩ
fr = 1 kHz
400 Hz HPF
30 kHz LPF
Rg = 10 kΩ
fr = 1 kHz
Vr = 1 V[rms]
1
10
100
1 000
10 000
0
10
15
20
25
5
Supply voltage VCC (V)
Power supply ripple voltage Vr (mV[rms])
RR fr
CT VCC
70
60
50
40
30
20
10
0
80
79
78
77
76
75
74
73
72
71
70
PO = 1 W
f = 1 kHz
RL = 4 Ω
400 Hz HPF
30 kHz LPF
Rg = 10 kΩ
ch.1
ch.2
ch.2
ch.1
VCC = 13.2 V
RL = 4 Ω
Rg = 10 kΩ
fr = 1 kHz
Vr = 1 V[rms]
0
10
15
20
25
5
10
100
1 000
10 000
Power supply ripple frequency fr (Hz)
Supply voltage VCC (V)
9
AN7199Z
ICs for Audio Common Use
■ Technical Information (continued)
[2] Main characteristics (continued)
CT
VIN
CT
f
80
70
60
50
40
30
20
90
ch.2
80
70
60
50
40
30
20
10
0
ch.1
ch.2
ch.1
V
CC = 13.2 V
f = 1 kHz
RL = 4 Ω
400 Hz HPF
30 kHz LPF
Rg = 10 kΩ
VCC = 13.2 V
VIN = 40 mV[rms]
RL = 4 Ω
10
0
Rg = 10 kΩ
1
10
100
1 000
10
100
1 000
10 000
100 000
Input voltage VIN (mV[rms])
Frequency f (Hz)
MT
VCC
MT
VIN
110
100
90
80
70
60
50
40
30
20
10
100
90
80
70
60
50
40
30
20
10
0
PO = 1 W
f = 1 kHz
RL = 4 Ω
400 Hz HPF
30 kHz LPF
Rg = 10 kΩ
VCC = 13.2 V
f = 1 kHz
RL = 4 Ω
400 Hz HPF
30 kHz LPF
Rg = 10 kΩ
0
25
0
10
100
1 000
10 000
5
10
15
20
Supply voltage VCC (V)
Input voltage VIN (mV[rms])
MT
f
MT
VMUTE
90
110
100
90
80
70
60
50
40
30
20
10
80
70
60
50
40
30
20
10
0
ch.2
ch.1
VCC = 13.2 V
PO = 1 W
f = 1 kHz
RL = 4 Ω
400 Hz HPF
30 kHz LPF
Rg = 10 kΩ
VCC = 13.2 V
VIN = 40 mV[rms]
RL = 4 Ω
Rg = 10 kΩ
10
100
1 000
10 000
100 000
0.0
1.0
2.0
3.0
4.0
5.0
Mute voltage VMUTE (V)
Frequency f (Hz)
10
ICs for Audio Common Use
AN7199Z
■ Technical Information (continued)
[2] Main characteristics (continued)
ICQ
VSTB
Voffset
VCC
200
180
160
140
120
100
80
250
200
150
100
50
ch.2
ch.1
ch.2 mute on
ch.1 mute on
0
−50
−100
−150
−200
−250
60
40
VCC = 13.2 V
RL = 4 Ω
Rg = 10 kΩ
RL = 4 Ω
Rg = 10 kΩ
20
0
0.0
2.0
3.0
4.0
5.0
0
20
1.0
5
10
15
Standby voltage VSTB (V)
Supply voltage VCC (V)
[3] Application note
1. Standby function
1) The power can be turned on or off by
making pin 5 (standby terminal) high
or low.
Table 1
Terminal voltage
0 V
Terminal state
Open
Power
2) The standby terminal has threshold
voltage of approx. 2.1 V, however, it
has temperature dependency of
approx. − 6 mV/°C. The recommended
range of use is shown in table 1.
Standby state
Standby state
Operating state
Low
0 V to 1.0 V
Higher than 3 V
High
3) The internal circuit of standby terminal is as shown in figure 1. When the standby terminal is high, the current
approximately expressed by the following equation will flow into the circuit.
VSTB−2.7 V
ISTB
=
[mA]
10 kΩ
10 kΩ
5 V
0 V
Protection
circuit
Constant
current source
5
VSTB
RF
Sub
2 kΩ
Figure 1
4) A power supply with no ripple component should be used for the control voltage of standby terminal .
4 kΩ
11
AN7199Z
ICs for Audio Common Use
■ Technical Information (continued)
[2] Application note (continued)
2. Oscillation countermeasures
1
1) In order to increase the oscillation allowance, it is unnecessary to use a
capacitor and a resistor between each output terminal and GND. How-
ever, when inserting the capacitor for counter-measures against output
line noise between the output terminal and GND, insert a resistor of
approx. 2.2 Ω in series as shown in figure 2. The oscillation may occur
if only capacitor is used. Use it after giving a sufficient evaluation
2) The use of polyester film capacitor having a little fluctuation with tem-
perature and frequency is recommended as the capacitor for counter-
measures against output line noise.
To speaker
2,4
13,15
0.01 µF to 0.1 µF
2.2 Ω
3,14
Figure 2
3. Input terminal
1) The reference voltage of input terminal is 0 V. When the input signal has a reference voltage other than 0 V
potential, connect a coupling capacitor (of about several µF) for DC component cut in series with the input
terminal. Check the low-pass frequency characteristics to determine the capacitor value.
2) 10 kΩ or less of signal source impedance Rg can reduce the output end noise voltage.
3) The output offset voltage fluctuates when the signal source impedance Rg is changed. A care must be taken
when using the circuit by directly connecting the volume to the input terminal. In such a case, the use of
coupling capacitor is recommended.
4) If a high frequency signal from tuners enters the input terminal as noise, insert a capacitor of approx. 0.01 µF
between the input terminal and input GND.
When a high frequency signal is inputted, malfunction in protective circuits may occur.
15 µA
15 µA
To power
1 µF
200 Ω
30 kΩ
600 Ω
6
11
Input signal
Attenuator
10 kΩ
0.01 µF
Figure 3
4. Ripple filter
1) In order to suppress the fluctuation of supply voltage, connect
a capacitor of approx. 33 µF between RF terminal (pin12) and
GND.
1 000
100
10
60
50
40
2) Relation between RR (Ripple Rejection Ratio) and a capacitor
The larger the capacitance of the ripple filter is, the better the
ripple rejection becomes.
3) Relation between the rise time of circuit and a capacitor
The larger the capacitance of the ripple filter is, the longer the
time from the power on (standby high) to the sound release
becomes.
4) The DC voltage of output terminal is approximately the middle
point of the ripple filter terminal voltage.
1.0
10
100
RF capacitor value (µF)
5) The internal circuit of ripple filter terminal is as shown in fig-
ure 5 and the charge current is approx. 3 mA to 10 mA.
Figure 4
12
ICs for Audio Common Use
AN7199Z
■ Technical Information (continued)
[2] Application note (continued)
4. Ripple filter (continued)
6) After the power supply is
turned off (STB-low), it takes
less than 10 seconds for the
total circuit current to become
the standby current (under 10
µA). If approx. 47 ohms resis-
tor is inserted between the
ripple filter terminal and GND
for the purpose of reducing
the inspection time with set, a
time until the current becomes
the standby current can be
shortened.
VCC
15 kΩ
Constant
current source circuit
Protection
12
33 µF
350 µA
1.7 mA
VREF
10 kΩ
10 kΩ
4 kΩ
Figure 5
5. GND terminal
1) Be sure to short-circuit each GND terminal of
pin 3, 8, 9 and 14 at the outside of the IC in use.
2) For each GND terminal, the one-point earth,
referenced to the GND connection point of
electrolytic capacitor between the supply ter-
minal and GND, is most effective for reduc-
ing the distortion. Even in the worst case,
ground pin 8, 9 of input GND separately from
all the other GND terminals.
AN7198Z, AN7199Z
1
3
8
9
14
To GND of input
Figure 6
3) Each GND terminal is not electrically short-circuited inside. Only pin 8 is connected with substrate.
4) Pin 9 is input signal GND. Connect only pin 9 with Pre-GND.
6. Cooling fin
1) The cooling fin is not connected with GND terminal by using Au wire. Only pin 8 is electrically connected
through substrate.
2) Always attach an outside heat sink to the cooling fin. The cooling fin must be fastened onto a chassis for use.
Otherwise, IC lead failure may occur.
3) Do not give the cooling fin any potential other than the GND potential. Otherwise, it may cause breakdown.
4) Connection of the cooling fin with GND can reduce the incoming noise hum. (It is unnecessary to connect
with GND in use, but connect with the power GND when the cooling fin is connected with GND)
7. Shock noise
1) STB on/off
No shock noise is released. However, the changeover switch of the standby terminal may make a slight
shock noise. In such a case, insert a capacitor of approx. 0.01 µF between the standby terminal and GND.
2) Mute on/off
No shock noise is released. Refer to the section on the mute function.
13
AN7199Z
ICs for Audio Common Use
■ Technical Information (continued)
[2] Application note (continued)
8. Mute Function
1) The mute-on/off is possible by making pin 7 (the muting terminal) high or low.
2) The muting circuit is as shown in figure 7. The amplifier gain including attenuator block is given in the
following equation :
I1
GV =
× 50
I2
Original gain
From the above equation, the amplifier gain can be made as 0 time by setting I1 at 0 mA at muting.
3) The threshold voltage of VMUTE is as follows :
Mute-off : approx. 1 V or less
Mute-on : approx. 3 V or more
I1
I2
Input
Output stage
Output stage
Mute/on
Mute/off
5 V
0 V
I1
I2
22 kΩ
1 µF
7
VMUTE
200 Ω
Attenuator block
I1 = approx.120 µA
I2 = approx.120 µA
Figure 7
4) Attack time and recovery time can be changed by the external CR of pin 7. For recommended circuits (In
figure 7 22 kΩ, 1 µF), the above mentioned times are as follows :
Attack time
: Approx. 30 ms
Recovery time : Approx. 40 ms
However, the control voltage of VMUTE is assumed to be 5 V. When it is not directly controlled by
microcomputer (5 V), (that is, 13.2 V separate power supply), it is necessary to change CR values because the
above times change.
5) When the attack time and recovery time are set at 20 ms or less, pay attention to the IC with larger output
offset because it may release the shock noise.
9. Voltage gain
The voltage gain is fixed at 34 dB for the AN7198Z, and 40 dB for the AN7199Z. It is not possible to change
those values by the addition of an external resistor.
14
ICs for Audio Common Use
AN7199Z
■ Technical Information (continued)
[2] Application note (continued)
10. Beep sound input function
1) The application circuit using the beep sound input is shown in figure 8. Connect the beep signals from the
microcomputer to pin 10 via the capacitor C1 for DC cut and the resistor R1 for voltage gain adjustment.
2) The voltage gain of beep sound terminal is approx. −6.2 dB. In the setting value of figure 8, it becomes approx.
−19.7 dB (f = 1 kHz).
3) The beep sound is outputted to the output, terminals pin 2 and pin 15.
Rnf
GVA
Rnf
AN7198Z
AN7199Z
600 Ω
300 Ω
28 dB
34 dB
VREF = 6.3 V
7.8 kΩ
GVA
2
47 kΩ
C1
0.022 µF
× GVA
15 kΩ
15 kΩ
10
Beep input
R1
15
Rnf
2
GVBEEP
=
GVA
VREF = 6.3 V
15 k+Rnf
Rnf
1/jωC1+R1+7.8 Κ+
2
Figure 8
11. Two IC use
Figure 9 shows the application circuit example when two ICs are used :
Out(RR)
10 kΩ
Power supply
2 200 µF
Standby
10 kΩ
Mute
Out(FR)
Out(RL)
2.2 µF
22 µF to 47 µF
10 kΩ
In(RR)
In(FR)
In(RL)
10 kΩ
In(FL)
S-GND
0.022 µF
47 kΩ
Out(FL)
Beep
10 kΩ
Figure 9
15
AN7199Z
ICs for Audio Common Use
■ Technical Information (continued)
[2] Application note (continued)
11. Two IC use (continued)
1) Supply terminal
Short-circuiting each other, insert an electrolytic capacitor of approx. 2 200 µF into the supply terminals.
However, if sufficient characteristics of the ripple rejection can not be obtained, use an even larger capacitor
or insert a 2 200 µF capacitor into each IC.
The best sound quality can be obtained by inserting a 2 200 µF capacitor near the terminal of each IC.
2) Standby terminal (pin 5)
Even if the standby terminals are connected with each other, that does not result in an abnormal operation.
Connect with the microcomputer after connecting the standby pins with each other. At that time, the current
flowing into the standby terminal is twice as large as the current which is described in 1. Standby function.
3) Muting terminal (pin 7)
An abnormal operation does not occur even if the muting terminals are short-circuited with each other.
The muting time constant changes when two ICs connection is made. If the CR constants are set at twice
and 1/2 time respectively, the time constant value becomes as same as the value when one IC is used.
In terms of safety design, taking advantage of the fact that a large current is difficult to flow when the mute
is being applied so that it is difficult to cause the destruction, it is designed so that the mute terminal will
become High when an abnormality such as the short-circuit to VCC or short-circuit to GND takes place. (To
avoid the influence of IC in an abnormal state when using two ICs).
Do not connect a microcomputer directly to the mute terminal because the mute terminal voltage rises to
approx. 12 V at that time.
4) Beep sound input terminal (pin 10)
Even if the the beep sound input terminals are short-circuited each other, that does not result in an abnormal
operation.
However, if there is a temperature difference between ICs, there may be a fluctuation of the output offset.
In order to avoid such a phenomenon, connect the ICs with each other through a resistor (47 kΩ).
5) Ripple filter terminal (pin 12)
Even if the ripple filter terminals are short-circuited each other, that does not result in an abnormal
operation.
However, if the standby of each IC is individually controlled, the short-circuiting is not allowed. Use the
circuit after connecting a capacitor (33 µF) to each IC.
12. Precautions on misuse
1) Erroneous connection in the case of short-circuit to VCC and short-circuit to GND or load short-circuit
The AN7198Z, AN7199Z have the breakdown voltage of 20 V or higher when an short-circuit to VCC and
short-circuit to GND or load short-circuit occur. However, there is a possibility of destruction, then smoke
emission and ignition under a special condition. Avoid misuse and erroneous connection of the circuit.
2) Power supply surge
The power supply surge breakdown voltage is evaluated by the test circuit shown in figure 10 and the surge
waveform as shown in figure 11 is evaluated.
The withstanding capability against power supply surge is 80 V for the AN7198Z, AN7199Z.
VP
1 Ω (allowance: ±1%) 20 W
0.63 VP
0.37 VP
Surge voltage
0 V
D.U.T
1 ms
6 ms
100 ms
Figure 10. Power supply surge test circuit
Figure 11. Surge waveform
16
ICs for Audio Common Use
AN7199Z
■ Technical Information (continued)
[2] Application note (continued)
12. Precautions on misuse (continued)
3) Destruction mode for the AN7198Z, AN7199Z
The AN7198Z, AN7199Z are the power ICs with high breakdown withstanding voltage but it has been
found that the destruction occurs under special conditions.
(1) GND-open short-circuit to GND
Short-circuit of the output terminal to the GND terminal of power supply when GND terminal of the
IC is open, or short-circuit to GND when the GND terminal of the IC is over 0.7 V higher than the short-
circuited output terminal.
At that time, if VCC = more than 16 V and a voltage is also applied to STB terminal, then the destruction
occurs.
(2) Short-circuit to VCC of the plus and minus side output terminals at the same time
If short-circuit to VCC fault occurs on both the plus and minus side output terminals at the same time
with a short-circuit resistor which does not actuate the protection circuit. The power GND terminal
current may exceed 10 A and the wire melts down since the current capacity of Au wire is exceeded.
(3) VCC − GND reverse connection
Parasitic device is created everywhere and the circuit destruction takes place.
■ Application Circuit Example
3
14
13
Ch.1 GND
Ch.2 GND
Ch.1 Out (−)
Ch.2 Out (−)
4
2
Ch.1 Out (+)
Ch.2 Out (+)
15
17
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