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TDA7851A
4 x 45 W MOSFET quad bridge power amplifier
Features

Multipower BCD technology High output power capability: - 4 x 45 W/4 Max. - 4 x 28 W/4 @ 14.4 V, 1 kHz, 10 % - 4 x 72 W/2 Max. MOSFET output power stage Excellent 2 driving capability Hi-Fi class distortion Low output noise Standby function Mute function Automute at min. supply voltage detection Low external component count: - Internally fixed gain (26 dB) - No external compensation - No bootstrap capacitors

Flexiwatt 27
Fortuitous open GND Reversed battery ESD
Description
The TDA7851A is a breakthrough MOSFET technology class AB audio power amplifier, designed for high-power car radio. The fully complementary P-Channel/N-Channel output structure allows a rail-to-rail output voltage swing. This, combined with high output current and minimized saturation losses, sets new power references in the car-radio field, with unparalleled distortion performance.
Protections

Output short circuit to Gnd, to Vs, across the load Very inductive loads Overrating chip temperature with soft thermal limiter Output DC offset detection Load dump voltage Device summary
Order code TDA7851A
Table 1.
Package Flexiwatt 27
Packing Tube
July 2010
Doc ID 17715 Rev 1
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Contents
TDA7851A
Contents
1 Block diagram and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 1.2 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 2.2 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1 3.2 3.3 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Electrical characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4
Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1 4.2 4.3 4.4 4.5 DC offset detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 SVR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Input stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Standby and muting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Heatsink definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5 6
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
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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
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List of figures
TDA7851A
List of figures
Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. Figure 9. Figure 10. Figure 11. Figure 12. Figure 13. Figure 14. Figure 15. Figure 16. Figure 17. Figure 18. Figure 19. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Quiescent current vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Output power vs. supply voltage (RL = 4 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Output power vs. supply voltage (RL = 2 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Distortion vs. output power (RL = 4 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Distortion vs. output power (RL = 2 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Distortion vs. frequency (RL = 4 ). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Distortion vs. frequency (RL = 2 ). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Crosstalk vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Supply voltage rejection vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Output attenuation vs. supply voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Power dissipation and efficiency vs. output power (RL = 4 , SINE) . . . . . . . . . . . . . . . . . 10 Power dissipation and efficiency vs. output power (RL = 2 , SINE) . . . . . . . . . . . . . . . . . 10 Power dissipation vs. output power (RL = 4 , audio program simulation) . . . . . . . . . . . . 11 Power dissipation vs. output power (RL = 2 , audio program simulation) . . . . . . . . . . . . 11 ITU R-ARM frequency response, weighting filter for transient pop. . . . . . . . . . . . . . . . . . . 11 Flexiwatt27 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
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Block diagram and application circuit
1
1.1
Block diagram and application circuit
Block diagram
Figure 1. Block diagram
Vcc1 Vcc2
ST-BY CD OUT1+ IN1 OUT1PW-GND OUT2+ IN2 OUT2PW-GND OUT3+ IN3 OUT3PW-GND OUT4+ IN4 OUT4PW-GND AC-GND SVR TAB S-GND OFFSET DETECTOR
D05AU1613
MUTE
1.2
Application circuit
Figure 2. Application circuit
OFFSET DETECTOR OUT C8 0.1F C7 2200F Vcc1-2 R1 ST-BY 10K R2 MUTE 47K C1 IN1 0.1F IN2 C2 0.1F IN3 C3 0.1F IN4 C4 0.1F S-GND 15 14 17 C5 0.47F C6 47F 11 SVR 26 CD 27 TAB
D05AU1614
R4 V Vcc3-4 7 21 2 10 9 OUT1 47K
5 C9 1F 23 C10 1F 12
8
6 3 4 OUT2
13
18 19 OUT3
16
20
22 25 24 OUT4
R3 V 47K CD OUT
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Pin description
TDA7851A
2
2.1
Pin description
Pin connection
Figure 3. Pin connection (top view)
1
27
TAB
OUT2-
PW-GND
OFF DET
OUT2+
ST-BY
OUT1-
OUT1+
S-GND
AC-GND
OUT3+
PW-GND
PW-GND
OUT3-
IN1
IN2
IN4
SVR
IN3
OUT4+
OUT4-
MUTE
PW-GND
D03AU1468A
2.2
Thermal data
Table 2.
Symbol Rth j-case
Thermal data
Parameter Thermal resistance junction-to-case Max Value 1 Unit C/W
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VCC
VCC
CD
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TDA7851A
Electrical specifications
3
3.1
Electrical specifications
Absolute maximum ratings
Table 3.
Symbol VS VS (DC) VS (pk) IO Ptot Tj Tstg
Absolute maximum ratings
Parameter Operating supply voltage DC supply voltage Peak supply voltage (for t = 50 ms) Output peak current Non repetitive (t = 100 s) Repetitive (duty cycle 10 % at f = 10 Hz) Power dissipation Tcase = 70 C Junction temperature Storage temperature Value 18 28 50 10 9 85 150 -55 to 150 Unit V V V A A W C C
3.2
Electrical characteristics
Refer to the test and application diagram, VS = 14.4 V; RL = 4 ; Rg = 600 ; f = 1 kHz; Tamb = 25 C; unless otherwise specified.
Table 4.
Symbol VS Iq1 VOS
Electrical characteristics
Parameter Supply voltage range Quiescent current Output offset voltage RL = Play mode / Mute mode Test condition Min. 8 100 -60 -10 -10 25 25 Typ. 150 26 28 22 48 38 45 75 0.01 Max. 18 300 +60 +10 +10 27 1 0.05 Unit V mA mV mV mV dB dB W W W W W W %
dVOS
During mute ON/OFF output offset voltage ITU R-ARM weighted see Figure 18 During standby ON/OFF output offset voltage Voltage gain Channel gain unbalance VS = 14.4 V; THD = 10 % VS = 14.4 V; THD = 1 % VS = 14.4 V; THD = 10 %, 2 VS = 14.4 V; THD = 1 %, 2 VS = 14.4 V; RL = 4 VS = 14.4 V; RL = 2 Po = 4 W
Gv dGv
Po
Output power
-
Po max. THD
Max. output power(1) Distortion
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Electrical specifications Table 4.
Symbol eNo SVR fch Ri CT ISB Ipin5 VSB out VSB in AM VM out VM in
TDA7851A
Electrical characteristics (continued)
Parameter Output noise Supply voltage rejection High cut-off frequency Input impedance Cross talk Test condition "A" Weighted Bw = 20 Hz to 20 kHz f = 100 Hz; Vr = 1 Vrms PO = 0.5 W f = 1 kHz, PO = 4 W f = 10 kHz, PO = 4 W VSt-by = 1.2 V VSt-by = 0 Standby pin current Standby out threshold voltage Standby in threshold voltage Mute attenuation Mute out threshold voltage Mute in threshold voltage VSt-by = 1.2 V to 2.6 V (Amp: ON) (Amp: OFF) POref = 4 W (Amp: Play) (Amp: Mute) (Amp: Mute) Att 80 dB; POref = 4 W Min. 50 100 70 60 2.6 80 2.6 6.7 Typ. 35 50 70 300 100 70 60 90 7 Max. Unit V V dB kHz k dB dB A A A V V dB V V V
100 130 20 10 1 1.2 1.2
Standby current consumption
VAM in
VS automute threshold (Amp: Play) Att < 0.1 dB; PO = 0.5 W 7 -5 7.5 12 8 18 18 V A A
Ipin23
Muting pin current
VMUTE = 1.2 V (Sourced current) VMUTE = 2.6 V
Offset detector VOFF Detected differential output offset VSt-by = 5 V Vo > 3 V, Ioff Det = 1 mA 0 V < Voff Det < 18 V Vo < 1 V 1 2 0.2 0 3 0.4 15 V V A
VOFF_SAT Off detector saturation voltage VOFF_LK Off detector leakage current
Clipping detector CDLK CDSAT CDTHD Clip detector high leakage current Clip detector saturation voltage Clip detector THD level Cd off DC On; ICD = 1 mA 0 0.2 2 1 0.4 A V %
1. Saturated square wave output
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TDA7851A
Electrical specifications
3.3
Figure 4.
Electrical characteristics curves
Quiescent current vs. supply voltage Figure 5. Output power vs. supply voltage (RL = 4 )
180
Id (mA)
80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5
Po (W)
170 160
Vi = 0 RL =
RL= 4 f =1 KHz
Po-max
150
THD=10%
140 130
THD=1%
120 8 10 12 Vs (V) 14 16 18
AC00024
8
9
10
11
12
13 Vs (V)
14
15
16
17
18
AC00025
Figure 6.
Output power vs. supply voltage (RL = 2 )
Figure 7.
Distortion vs. output power (RL = 4 )
Po (W) 130 120 110 100 90 80 70 60 50 40 30 20 10 0 8 9 10 11 12 13 Vs (V) 14 15 16 17 18
AC00026
THD (% ) 10 Po-max 1 f = 10 KHz 0.1
RL=2 f=1 KHz
Vs = 14.4 V RL = 4
THD=10%
THD=1% 0.01
f = 1 KHz
0.001 0.1
1 Po (W)
10
100
AC00027
Figure 8.
Distortion vs. output power (RL = 2 )
Figure 9.
Distortion vs. frequency (RL = 4 )
THD (% ) 10 Vs = 14.4 V RL = 2 1 f = 10 KHz 0.1 f = 1 KHz 0.01
10
THD (% )
1
Vs = 14.4 V RL = 4 Po = 4 W
0.1
0.01
0.001 0.1
1 Po (W)
10
100
AC00028
0.001 10
100
1000 f (Hz)
10000
100000
AC00029
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Electrical specifications
TDA7851A
Figure 10. Distortion vs. frequency (RL = 2 )
THD (% )
Figure 11. Crosstalk vs. frequency
10
-20 -30 -40 -50
CROSSTALK (dB) RL = 4 Po = 4W Rg = 600
1
Vs = 14.4 V RL = 2 Po = 8 W
0.1
-60 -70
0.01
-80 -90
0.001 10
100
1000 f (Hz)
10000
100000
AC00030
-100 10
100
1000 f (Hz)
10000
100000
AC00031
Figure 12. Supply voltage rejection vs. frequency
Figure 13. Output attenuation vs. supply voltage
-20 -30 -40 -50 -60 -70 -80
SVR (dB) Rg = 600 Vripple = 1Vrms 0
OUTPUT ATTN (dB) RL = 4 Po = 4 W ref
-20
-40
-60
-80 -90 -100 10 -100 100 1000 f (Hz) 10000 100000
AC00032
5
6
7 Vs (V)
8
9
10
AC00033
Figure 14. Power dissipation and efficiency vs. output power (RL = 4 , SINE)
Ptot (W) 90 80 70 60 50 40 30 20 10 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 Po (W) Ptot Vs = 14.4 V RL = 4 x 4 f = 1 KHz SINE (% ) 90 80 70 60 50 40 30 20 10 0
Figure 15. Power dissipation and efficiency vs. output power (RL = 2 , SINE)
Ptot (W) Vs = 14.4 V RL = 4 x 2 f = 1 KHz SINE (%)
180 160 140 120 100 80 60 40 20 0
90 80
70 60 50 40
Ptot
30 20 10
0
5
10
15
20
25 Po (W)
30
35
40
45
0 50
AC00035
AC00034
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Electrical specifications
Figure 16. Power dissipation vs. output power Figure 17. Power dissipation vs. output power (RL = 4 , audio program simulation) (RL = 2 , audio program simulation)
30 Ptot (W) Vs = 14.4 V RL = 4 x 4 GAUSSIAN NOISE CLIP START 20 60 55 50 45 40 35 30 15 25 20 10 15 10 5 0 1 2 3 Po (W) 4 5 6
AC00036
Ptot (W) Vs = 14.4 V RL = 4 x 2 GAUSSIAN NOISE CLIP START
25
5 0 2 4 Po (W) 6 8 10
AC00037
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
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Application hints
TDA7851A
4
4.1
Application hints
DC offset detector
The TDA7851A integrates a DC offset detector to avoid that an anomalous DC offset on the inputs of the amplifier may be multiplied by the gain and result in a dangerous large offset on the outputs which may lead to speakers damage for overheating. The feature works with the amplifier unmuted and no signal at the inputs.
4.2
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 10 F.
4.3
Input stage
The TDA7851A's inputs are ground-compatible and can stand very high input signals ( 8 Vpk) without any performance degradation. If the standard value for the input capacitors (0.1F) is adopted, the low frequency cut-off amounts to 16 Hz. The input capacitors should be 1/4 of the capacitor connected to AC-GND pin for optimum pop performance.
4.4
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 k equivalent resistance should present between the power supply and the muting and standby 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.
4.5
Heatsink definition
Under normal usage (4 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) causes Pdiss = 26 W. Assuming Tamb = 70 C and TCHIP = 150 C as boundary conditions, the 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.
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TDA7851A
Package information
5
Package information
In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK(R) packages, depending on their level of environmental compliance. ECOPACK(R) specifications, grade definitions and product status are available at: www.st.com. ECOPACK(R) is an ST trademark. Figure 19. Flexiwatt27 mechanical data and package dimensions
DIM. A B C D E F (1) G G1 H (2) H1 H2 H3 L (2) L1 L2 (2) L3 L4 L5 M M1 N O R R1 R2 R3 R4 V V1 V2 V3 MIN. 4.45 1.80 0.75 0.37 0.80 25.75 28.90 mm TYP. 4.50 1.90 1.40 0.90 0.39 1.00 26.00 29.23 17.00 12.80 0.80 22.47 18.97 15.70 7.85 5 3.5 4.00 4.00 2.20 2 1.70 0.5 0.3 1.25 0.50 MAX. 4.65 2.00 1.05 0.42 0.57 1.20 26.25 29.30 MIN. 0.175 0.070 0.029 0.014 0.031 1.014 1.139 inch TYP. 0.177 0.074 0.055 0.035 0.015 0.040 1.023 1.150 0.669 0.503 0.031 0.884 0.747 0.618 0.309 0.197 0.138 0.157 0.157 0.086 0.079 0.067 0.02 0.12 0.049 0.019 MAX. 0.183 0.079 0.041 0.016 0.022 0.047 1.033 1.153
OUTLINE AND MECHANICAL DATA
22.07 18.57 15.50 7.70
22.87 19.37 15.90 7.95
0.869 0.731 0.610 0.303
0.904 0.762 0.626 0.313
3.70 3.60
4.30 4.40
0.145 0.142
0.169 0.173
5 (Typ.) 3 (Typ.) 20 (Typ.) 45 (Typ.)
Flexiwatt27 (vertical)
(1): dam-bar protusion not included (2): molding protusion included
V C B V H H1 H3
O
V3
H2 R3 R4
A
L4
V1
N
R2 R L L1
L2
L3
V1
V2
R2 L5 G G1 F
R1 R1 R1 E
FLEX27ME
D
Pin 1
M
M1
7139011
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Revision history
TDA7851A
6
Revision history
Table 5.
Date 09-Jul-2010
Document revision history
Revision 1 Initial release. Changes
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TDA7851A
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