STMicroelectronics tda7850 Datasheet
4 x 50 W MOSFET quad bridge power amplifier
Flexiwatt25
(Vertical)
Flexiwatt25
(Horizontal)
Features
■ High output power capability:
–4 x 50 W/4 max.
–4 x 30 W/4 @ 14.4 V, 1 kHz, 10 %
–4 x 80 W/2 max.
–4 x 55 W/2 @ 14.4V, 1 kHz, 10 %
■ MOSFET output power stage
■ Excellent 2 driving capability
■ Hi-Fi class distortion
■ Low output noise
■ ST-BY function
■ Mute function
■ Automute at min. supply voltage detection
■ Low external component count:
– Internally fixed gain (26 dB)
– No external compensation
– No bootstrap capacitors
■ On board 0.35 A high side driver
Protections:
■ Output short circuit to gnd, to V
load
■ Very inductive loads
■ Overrating chip temperature with soft thermal
limiter
■ Output DC offset detection
■ Load dump voltage
■ Fortuitous open gnd
■ Reversed battery
Table 1. Device summary
Order code Package Packing
, across the
s
TDA7850
■ ESD
Description
The TDA7850 is a breakthrough MOSFET
technology class AB audio power amplifier in
Flexiwatt 25 package designed for high power car
radio. The fully complementary P-Channel/NChannel 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.
The TDA7850 integrates a DC offset detector.
TDA7850 Flexiwatt25 (Vertical) Tube
TDA7850H Flexiwatt25 (Horizontal Tube
September 2013 Rev 6 1/18
www.st.com
1
Contents TDA7850
Contents
1 Block diagram and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 Standard test and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.4 Electrical characteristic curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4 Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1 SVR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.2 Input stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.3 Standby and muting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.4 DC offset detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.5 Heatsink definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2/18
TDA7850 List of tables
List of tables
Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 2. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 3. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 4. Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 5. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3/18
List of figures TDA7850
List of figures
Figure 1. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2. Standard test and application circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 3. Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 4. Components and top copper layer of the Figure 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 5. Bottom copper layer Figure 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 6. Quiescent current vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 7. Output power vs. supply voltage (R
Figure 8. Output power vs. supply voltage (R
Figure 9. Distortion vs. output power (R
Figure 10. Distortion vs. output power (R
Figure 11. Distortion vs. frequency (R
Figure 12. Distortion vs. frequency (R
= 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
L
= 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
L
Figure 13. Crosstalk vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 14. Supply voltage rejection vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 15. Output attenuation vs. supply voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 16. Power dissipation and efficiency vs. output power (R
Figure 17. Power dissipation and efficiency vs. output power (R
Figure 18. Power dissipation vs. output power (R
Figure 19. Power dissipation vs. output power (R
Figure 20. ITU R-ARM frequency response, weighting filter for transient pop. . . . . . . . . . . . . . . . . . . 13
Figure 21. Flexiwatt25 (vertical) mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . 15
Figure 22. Flexiwatt25 (horizontal) mechanical data and package dimensions. . . . . . . . . . . . . . . . . . 16
= 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
L
= 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
L
= 4). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
L
= 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
L
= 4, SINE) . . . . . . . . . . . . . . . . . 12
L
= 2, SINE) . . . . . . . . . . . . . . . . . 12
= 4, audio program simulation) . . . . . . . . . . . . . 13
L
= 2, audio program simulation) . . . . . . . . . . . . . 13
L
L
4/18
TDA7850 Block diagram and application circuit
IN1
0.1μF
MUTE
ST-BY
IN2
0.1μF
OUT1+
OUT1-
OUT2+
OUT2-
PW-GND
IN3
0.1μF
IN4
0.1μF
OUT3+
OUT3-
OUT4+
OUT4-
PW-GND
PW-GND
PW-GND
D94AU158D
AC-GND
0.47μF47μF
SVR TAB S-GND
Vcc1 Vcc2
100nF470μF
HSD/V
OFF_DET
HSD
IN1
0.1μF
C9
1μF
IN2
C2 0.1μF
OUT1
OUT2
IN3
C3 0.1μF
IN4
C4 0.1μF
OUT3
OUT4
D95AU335C
C5
0.47μF
C6
47μF
SVR TAB
Vcc1-2
Vcc3-4
C8
0.1μF
C7
2200μF
C10
1μF
ST-BY
R1
10K
R3
*)
R2
47K
MUTE
C1
14
15
12
11
22
4
13
S-GND
16 10 25 1
HSD/OD
620
9
8
7
5
2
3
17
18
19
21
24
23
*) R3 = 10kΩ to be placed when pin 25 is used as offset detector.
1 Block diagram and application circuit
1.1 Block diagram
Figure 1. Block diagram
1.2 Standard test and application circuit
Figure 2. Standard test and application circuit
5/18
Pin description TDA7850
D94AU159A
TAB
P-GND2
OUT2-
ST-BY
OUT2+
V
CC
OUT1-
P-GND1
OUT1+
SVR
IN1
IN2
S-GND
IN4
IN3
AC-GND
OUT3+
P-GND3
OUT3-
V
CC
OUT4+
MUTE
OUT4-
P-GND4
HSD
1
25
D06AU1655
TAB
P-GND2
OUT2-
ST-BY
OUT2+
V
CC
OUT1-
P-GND1
OUT1+
SVR
IN1
IN2
S-GND
IN4
IN3
AC-GND
OUT3+
P-GND3
OUT3-
V
CC
OUT4+
MUTE
OUT4-
P-GND4
HSD
1
25
Vertical
Horizontal
2 Pin description
Figure 3. Pin connection (top view)
6/18
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