STMicroelectronics TDA7850, TDA7850H Service Manual
www.DataSheet4U.com
Quad bridge power amplifier plus HSD
Features
■ Superior output power capability:
4 x 50W/4Ω Max.
4 x 30W/4Ω @ 14.4V, 1KHz, 10%
4 x 80W/2Ω Max.
4 x 55W/2Ω @ 14.4V, 1KHz, 10%
■ MOSFET Output power stage
■ Excellent 2Ω 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 (26dB)
– No external compensation
– No bootstrap capacitors
■ On board 0.35A 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
■ ESD
, across the
s
TDA7850
4 x 50W MOSFET
Flexiwatt25
(Vertical)
Flexiwatt25
(Horizontal)
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 minimised saturation losses,
sets new power references in the car-radio field,
with unparalleled distortion performances.
The TDA7850 integrates a DC offset detector.
Order codes
Part number Package Packing
TDA7850 Flexiwatt25 (Vertical) Tube
TDA7850H Flexiwatt25 (Horizontal) Tube
November 2006 Rev 1 1/14
www.st.com
1
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Contents TDA7850
Contents
1 Block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Application hints (ref. to the circuit of Figure 3) . . . . . . . . . . . . . . . . . 10
3.1 SVR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2 Input stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.3 Stand-by and muting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.4 DC offset detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.5 Heatsink definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4 Package Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
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TDA7850 List of tables
List of tables
Table 1. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 2. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 3. Electrical characteristcs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 4. Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
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List of figures TDA7850
List of figures
Figure 1. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2. Pin connection (Top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 3. Standard test and application circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 4. P.C.B. and component layout of the Figure 3... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 5. Flexiwatt25 (vertical) mechanical data & package dimensions. . . . . . . . . . . . . . . . . . . . . . 11
Figure 6. Flexiwatt25 (horizontal) mechanical data & package dimensions . . . . . . . . . . . . . . . . . . . 12
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TDA7850 Block diagram and pin description
1 Block diagram and pin description
Figure 1. Block diagram
Vcc1 Vcc2
ST-BY
MUTE
IN1
0.1μF
IN2
0.1μF
IN3
0.1μF
IN4
0.1μF
AC-GND
0.47μF47μF
SVR TAB S-GND
Figure 2. Pin connection (Top view)
TAB
P-GND2
OUT2-
ST-BY
OUT2+
V
OUT1-
P-GND1
OUT1+
SVR
IN1
IN2
S-GND
IN4
IN3
AC-GND
OUT3+
P-GND3
OUT3-
V
OUT4+
MUTE
OUT4-
P-GND4
HSD
CC
CC
1
25
D94AU159A
Ver tic al
TAB
P-GND2
OUT2-
ST-BY
OUT2+
V
OUT1-
P-GND1
OUT1+
SVR
IN1
IN2
S-GND
IN4
IN3
AC-GND
OUT3+
P-GND3
OUT3-
V
OUT4+
MUTE
OUT4-
P-GND4
HSD
100nF470μF
HSD
CC
CC
HSD/V
OUT1+
OUT1-
PW-GND
OUT2+
OUT2-
PW-GND
OUT3+
OUT3-
PW-GND
OUT4+
OUT4-
PW-GND
D94AU158D
1
25
OFF_DET
D06AU1655
Horizontal
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