TDA7851L [ETC]
; - 12号的铝制车身绘（ RAL 7032 ）
ETC 
TDA7851L
4 x 45 W MOSFET quad bridge power amplifier
Features
■ Multipower BCD technology
■ High output power capability:
– 4 x 45 W/4 Ω Max.
– 4 x 28 W/4 Ω @ 14.4 V, 1 kHz, 10 %
– 4 x 72 W/2 Ω Max.
■ MOSFET output power stage
■ Excellent 2 Ω driving capability
■ Hi-Fi class distortion
Flexiwatt 25
■ Low output noise
■ Standby function
■ Mute function
■ Fortuitous open GND
■ Automute at min. supply voltage detection
■ Reversed battery
■ ESD
■ Low external component count:
– Internally fixed gain (26 dB)
– No external compensation
– No bootstrap capacitors
Description
The TDA7851L is a breakthrough MOSFET
technology class AB audio power amplifier in
Flexiwatt25 package designed for high power car
radio. The fully complementary P-Channel/N-
Channel output structure allows a rail to rail
output voltage swing which, combined with high
output current and minimized saturation losses
sets new power references in the car-radio field,
with unparalleled distortion performances.
Protections
■ Output short circuit to Gnd, to Vs, across the
load
■ Very inductive loads
■ Overrating chip temperature with soft thermal
limiter
■ Load dump voltage
Table 1.
Device summary
Order code
Package
Flexiwatt 25
Packing
TDA7851L
Tube
May 2009
Rev 1
1/15
www.st.com
1
Contents
TDA7851L
Contents
1
2
3
Block diagram and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1
1.2
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1
2.2
Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1
3.2
3.3
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electrical characteristic curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4
Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1
4.2
4.3
4.4
SVR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Input stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Standby and muting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Heatsink definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5
6
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2/15
Rev 1
TDA7851L
List of tables
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Device summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Rev 1
3/15
List of figures
TDA7851L
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Quiescent current vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Output power vs. supply voltage (R = 4 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
L
Output power vs. supply voltage (R = 2 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
L
Distortion vs. output power (R = 4 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
L
Distortion vs. output power (R = 2 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
L
Distortion vs. frequency (R = 4 Ω). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
L
Figure 10. Distortion vs. frequency (R = 2 Ω). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
L
Figure 11. Crosstalk vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 12. Supply voltage rejection vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 13. Output attenuation vs. supply voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 14. Power dissipation and efficiency vs. output power (R = 4 Ω, SINE) . . . . . . . . . . . . . . . . . 10
L
Figure 15. Power dissipation and efficiency vs. output power (R = 2 Ω, SINE) . . . . . . . . . . . . . . . . . 10
L
Figure 16. Power dissipation vs. output power (R = 4 Ω, audio program simulation) . . . . . . . . . . . . 11
L
Figure 17. Power dissipation vs. output power (R = 2 Ω, audio program simulation) . . . . . . . . . . . . 11
L
Figure 18. ITU R-ARM frequency response, weighting filter for transient pop. . . . . . . . . . . . . . . . . . . 11
Figure 19. Flexiwatt25 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4/15
Rev 1
TDA7851L
Block diagram and application circuit
1
Block diagram and application circuit
1.1
Block diagram
Figure 1.
Block diagram
Vcc1
Vcc2
ST-BY
MUTE
CD
OUT1+
OUT1-
IN1
IN2
IN3
IN4
PW-GND
OUT2+
OUT2-
PW-GND
OUT3+
OUT3-
PW-GND
OUT4+
OUT4-
PW-GND
AC-GND
SVR
TAB
S-GND
D06AU1646
1.2
Application circuit
Figure 2.
Application circuit
C8
C7
0.1μF
2200μF
Vcc1-2
Vcc3-4
6
20
R1
10K
R2
ST-BY
MUTE
4
9
8
7
C9
1μF
OUT1
OUT2
OUT3
OUT4
22
47K
C1
C10
1μF
5
2
3
IN1
IN2
IN3
IN4
11
12
15
0.1μF
17
18
19
C2 0.1μF
C3 0.1μF
C4 0.1μF
21
24
23
14
13
S-GND
16
10
25
1
SVR
TAB
CD
C5
0.47μF
C6
47μF
D06AU1647A
R3
V
47K
CD OUT
Rev 1
5/15
Pin description
TDA7851L
2
Pin description
2.1
Pin connection
Figure 3.
Pin connection (top view)
1
25
D94AU159mod
2.2
Thermal data
Table 2.
Symbol
Thermal data
Parameter
Value
Unit
Rth j-case Thermal resistance junction-to-case
Max
1
°C/W
6/15
Rev 1
TDA7851L
Electrical specifications
3
Electrical specifications
3.1
Absolute maximum ratings
Table 3.
Symbol
Absolute maximum ratings
Parameter
Value
Unit
VS
Operating supply voltage
18
28
50
V
V
V
VS (DC) DC supply voltage
VS (pk) Peak supply voltage (for t = 50 ms)
Output peak current
IO
Non repetitive (t = 100 µs)
Repetitive (duty cycle 10 % at f = 10 Hz)
10
9
A
A
Ptot
Tj
Power dissipation Tcase = 70 °C
Junction temperature
85
W
°C
°C
°C
150
Tamb
Tstg
Operating temperature range
Storage temperature
-40 to 105
-55 to 150
3.2
Electrical characteristics
Table 4.
Electrical characteristics
(Refer to the test and application diagram, VS = 14.4 V; RL = 4 Ω; Rg = 600 Ω; f = 1 kHz;
amb = 25 °C; unless otherwise specified).
T
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
VS
Iq1
Supply voltage range
Quiescent current
-
8
-
150
-
18
V
RL = ∞
100
-60
300
+60
mA
mV
VOS
Output offset voltage
Play mode / Mute mode
During mute on/off output offset
voltage
-10
-
+10
+10
mV
mV
ITU R-ARM weighted
dVOS
see Figure 18
During standby on/off output offset
voltage
-10
25
-
Gv
Voltage gain
-
-
26
27
1
dB
dB
dGv
Channel gain unbalance
VS = 14.4 V; THD = 10 %
VS = 14.4 V; THD = 1 %
25
-
28
22
W
W
-
-
Po
Output power
VS = 14.4 V; THD = 10 %, 2 Ω
VS = 14.4 V; THD = 1 %, 2 Ω
48
38
W
W
-
VS = 14.4 V; RL = 4 Ω
VS = 14.4 V; RL = 2 Ω
45
75
W
W
Po max. Max. output power(1)
THD Distortion
-
-
-
Po = 4 W
0.01
0.05
%
Rev 1
7/15
Electrical specifications
TDA7851L
Table 4.
Electrical characteristics (continued)
(Refer to the test and application diagram, VS = 14.4 V; RL = 4 Ω; Rg = 600 Ω; f = 1 kHz;
amb = 25 °C; unless otherwise specified).
Parameter Test condition
T
Symbol
Min.
Typ.
Max.
Unit
"A" Weighted
35
50
-
µV
µV
eNo
Output noise
-
Bw = 20 Hz to 20 kHz
f = 100 Hz; Vr = 1 Vrms
PO = 0.5 W
100
SVR
fch
Supply voltage rejection
High cut-off frequency
Input impedance
50
100
70
70
-
-
dB
KHz
KΩ
300
100
Ri
130
f = 1 kHz PO = 4 W
f = 10 kHz PO = 4 W
60
-
70
60
-
-
dB
dB
CT
Cross talk
VSt-by = 1.2 V
VSt-by = 0
-
-
-
-
20
10
1
µA
µA
µA
V
ISB
Standby current consumption
Standby pin current
Ipin5
VSt-by = 1.2 V to 2.6 V
(Amp: ON)
-
-
VSB out Standby out threshold voltage
2.6
-
-
-
VSB in
AM
Standby in threshold voltage
Mute attenuation
(Amp: OFF)
POref = 4 W
-
1.2
-
V
80
2.6
-
90
-
dB
V
VM out
VM in
Mute out threshold voltage
Mute in threshold voltage
(Amp: Play)
(Amp: Mute)
-
-
1.2
V
(Amp: Mute)
Att ≥ 80 dB; POref = 4 W
6.7
7
-
V
VAM in
VS automute threshold
Muting pin current
(Amp: Play)
Att < 0.1 dB; PO = 0.5 W
-
7.5
12
-
8
V
VMUTE = 1.2 V
7
18
18
µA
µA
(Sourced current)
Ipin23
VMUTE = 2.6 V
-5
Clipping detector
CDLK
Clip detector high leakage current Cd off
-
-
-
0
0.2
2
1
0.4
-
µA
V
CDSAT Clip detector saturation voltage
CDTHD Clip detector THD level
1. Saturated square wave output
DC On; ICD = 1 mA
-
%
8/15
Rev 1
TDA7851L
Electrical specifications
3.3
Electrical characteristic curves
Figure 4.
Quiescent current vs. supply
voltage
Figure 5.
Output power vs. supply voltage
(R = 4 Ω)
L
Po (W)
Id (mA)
180
80
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
170
160
150
140
130
120
Vi = 0
RL
Po-max
RL= 4Ω
f =1 KHz
=
∞
THD=10%
THD=1%
8
10
12
14
16
18
8
9
10
11
12
13
14
15
16
17
18
AC00024
V
(V)
Vs (V)
s
AC00025
Figure 6.
Output power vs. supply voltage
(R = 2 Ω)
Figure 7.
Distortion vs. output power
(R = 4 Ω)
L
L
Po (W)
THD (%)
130
120
110
100
90
10
1
Po-max
Vs = 14.4 V
L = 4Ω
RL=2Ω
f=1 KHz
R
80
f = 10 KHz
f = 1 KHz
THD=10%
THD=1%
70
0.1
60
50
40
0.01
0.001
30
20
10
0
8
9
10
11
12
13
14
15
16
17
18
0.1
1
10
100
AC00027
Po (W)
Vs (V)
AC00026
Figure 8.
Distortion vs. output power
Figure 9.
Distortion vs. frequency (R = 4 Ω)
L
(R = 2 Ω)
L
THD (%)
10
THD (%)
10
Vs = 14.4 V
L = 2 Ω
Vs = 14.4 V
L = 4 Ω
o = 4 W
R
R
P
1
0.1
1
0.1
f = 10 KHz
f = 1 KHz
0.01
0.001
0.01
0.001
10
100
1000
f (Hz)
10000
100000
0.1
1
10
100
AC00029
Po (W)
AC00028
Rev 1
9/15
Electrical specifications
TDA7851L
Figure 10. Distortion vs. frequency (R = 2 Ω) Figure 11. Crosstalk vs. frequency
L
CROSSTALK (dB)
THD (%)
-20
-30
-40
-50
-60
-70
-80
-90
-100
10
1
RL = 4 Ω
Vs = 14.4 V
L = 2Ω
Po = 8 W
Po = 4W
R
Rg = 600Ω
0.1
0.01
0.001
10
100
1000
f (Hz)
10000
100000
10
100
1000
f (Hz)
10000
100000
AC00030
AC00031
Figure 12. Supply voltage rejection vs.
frequency
Figure 13. Output attenuation vs. supply
voltage
SVR (dB)
-20
OUTPUT ATTN (dB)
0
Rg = 600Ω
ripple = 1Vrms
-30
-40
-50
-60
-70
-80
-90
-100
RL = 4Ω
Po = 4 W ref
V
-20
-40
-60
-80
-100
10
100
1000
f (Hz)
10000
100000
5
6
7
8
9
10
Vs (V)
AC00033
AC00032
Figure 14. Power dissipation and efficiency
Figure 15. Power dissipation and efficiency
vs. output power (R = 4 Ω, SINE)
vs. output power (R = 2 Ω, SINE)
L
L
Ptot (W)
η (%)
η (%)
Ptot (W)
180
160
140
120
100
80
90
90
90
80
70
60
50
40
30
20
10
0
η
80
70
60
50
40
30
20
10
0
Vs = 14.4 V
RL = 4 x 2Ω
f = 1 KHz SINE
80
70
Vs = 14.4 V
L = 4 x 4Ω
f = 1 KHz SINE
η
R
60
50
40
Ptot
Ptot
30
20
60
40
10
0
20
0
0
2
4
6
8
10 12 14 16 18 20 22 24 26 28
0
5
10
15
20
25
Po (W)
30
35
40
45
50
Po (W)
AC00034
AC00035
10/15
Rev 1
TDA7851L
Electrical specifications
Figure 16. Power dissipation vs. output power Figure 17. Power dissipation vs. output power
(R = 4 , audio program simulation) (R = 2 , audio program simulation)
Ω
Ω
L
L
Ptot (W)
Ptot (W)
30
25
20
15
10
5
60
55
50
45
40
35
30
25
20
15
10
5
Vs = 14.4 V
L = 4 x 4 Ω
GAUSSIAN NOISE
Vs = 14.4 V
L = 4 x 2 Ω
GAUSSIAN NOISE
R
R
CLIP START
CLIP START
0
1
2
3
4
5
6
0
2
4
6
8
10
Po (W)
Po (W)
AC00037
AC00036
Figure 18. ITU R-ARM frequency response,
weighting filter for transient pop
Output attenuation (dB)
10
0
-10
-20
-30
-40
-50
10
100
1000
Hz
10000
100000
AC00343
Rev 1
11/15
Application hints
TDA7851L
4
Application hints
4.1
SVR
Besides its contribution to the ripple rejection, the SVR capacitor governs the turn ON/OFF
time sequence and, consequently, plays an essential role in the pop optimization during
ON/OFF transients. To conveniently serve both needs, its minimum recommended value
is 10µF.
4.2
4.3
Input stage
The TDA7851L's inputs are ground-compatible and can stand very high input signals
( 8 Vpk) without any performances degradation.
If the standard value for the input capacitors (0.1µF) is adopted, the low frequency cut-off
will amount to 16 Hz.
The input capacitors should be 1/4 of the capacitor connected to AC-GND pin for optimum
pop performances.
Standby and muting
Standby and muting facilities are both CMOS-compatible. In absence of true CMOS ports or
microprocessors, a direct connection to Vs of these two pins is admissible but a 470 kΩ
equivalent resistance should present between the power supply and the muting and stand-
by pins.
R-C cells have always to be used in order to smooth down the transitions for preventing any
audible transient noises.
About the standby, the time constant to be assigned in order to obtain a virtually pop-free
transition has to be slower than 2.5 V/ms.
4.4
Heatsink definition
Under normal usage (4 Ω speakers) the heatsink's thermal requirements have to be
deduced from Figure 16, which reports the simulated power dissipation when real
music/speech programmes are played out. Noise with gaussian-distributed amplitude was
employed for this simulation. Based on that, frequent clipping occurrence (worst-case) will
cause P
= 26 W. Assuming Tamb = 70° C and TCHIP = 150 °C as boundary conditions, the
diss
heatsink's thermal resistance should be approximately 2 °C/W. This would avoid any
thermal shutdown occurrence even after long-term and full-volume operation.
12/15
Rev 1
TDA7851L
Package information
5
Package information
In order to meet environmental requirements, ST offers these devices in different grades of
®
®
ECOPACK packages, depending on their level of environmental compliance. ECOPACK
specifications, grade definitions and product status are available at: www.st.com.
®
ECOPACK is an ST trademark.
Figure 19. Flexiwatt25 mechanical data and package dimensions
mm
inch
TYP. MAX.
4.65 0.175 0.177 0.183
2.00 0.070 0.074 0.079
0.055
DIM.
MIN. TYP. MAX. MIN.
OUTLINE AND
MECHANICAL DATA
A
B
C
D
E
4.45
1.80
4.50
1.90
1.40
0.90
0.39
0.75
0.37
1.05 0.029 0.035 0.041
0.42 0.014 0.015 0.016
F (1)
G
0.57
0.022
0.80
1.00
1.20 0.031 0.040 0.047
G1
23.75 24.00 24.25 0.935 0.945 0.955
H (2) 28.90 29.23 29.30 1.139 1.150 1.153
H1
H2
H3
17.00
12.80
0.80
0.669
0.503
0.031
L (2) 22.07 22.47 22.87 0.869 0.884 0.904
L1 18.57 18.97 19.37 0.731 0.747 0.762
L2 (2) 15.50 15.70 15.90 0.610 0.618 0.626
L3
L4
L5
M
M1
N
O
R
R1
R2
R3
R4
7.70
7.85
5
3.5
4.00
4.00
2.20
2
1.70
0.5
7.95 0.303 0.309 0.313
0.197
0.138
3.70
3.60
4.30 0.145 0.157 0.169
4.40 0.142 0.157 0.173
0.086
0.079
0.067
0.02
0.12
0.049
0.019
0.3
1.25
0.50
V
5˚ (T p.)
3˚ (Typ.)
20˚ (Typ.)
45˚ (Typ.)
Flexiwatt25 (vertical)
V1
V2
V3
(1): dam-bar protusion not included
(2): molding protusion included
V
C
B
V
H
H1
V3
A
H2
R3
H3
R4
V1
R2
R
L
L1
V1
V2
D
R2
R1
R1
M
R1
E
L5
Pin 1
G
F
G1
M1
7034862
FLEX25ME
Rev 1
13/15
Revision history
TDA7851L
6
Revision history
Table 5.
Date
26-May-2009
Document revision history
Revision
Changes
1
Initial release.
14/15
Rev 1
TDA7851L
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