Service manual

CP-850/F Service Manual
-37-
4.6 TDA894XJ STEREO AUDIO AMPLIFIER
The TDA 8944J ( TDA 8946J ) is a dual-channel audio power amplifier with an output power of 2 x 7 W ( 2 x 15 W ) at
an 8
load and a 12 V supply. The circuit contains two Bridges Tied Load (BTL) amplifiers with an all-NPN output
stage and standby/mute logic. The TDA8944J comes in a 17-pin DIL power package.
4.6.1 FEATURES
Few external components
Fixed gain
Standby and mute mode
No on/off switching plops
low standby current
High supply voltage ripple rejection
Outputs short-circuit protected to ground, supply and across the load
Thermally protected
Pin description
Pin Symbol Description
1 OUT1- negative loudspeaker terminal 1
2 GND1 ground channel 1
3 Vcc1 supply voltage channel 1
4 OUT1+ positive loudspeaker terminal 1
5 n.c. not connected
6 IN1+ positive input1
7 n.c. not connected
8 IN1- negative input1
9 IN2- negative input2
10 MODE mode selection input
11 SVR half supply voltage decoupling (ripple rejection)
12 IN2+ positive input2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
OUT1-
GND1
Vcc1
OUT1+
n.c.
IN1+
n.c.
IN1-
IN2-
MODE
SVR
IN2+
n.c
OUT2+
GND2
Vcc2
OUT2-
TDA8946J