SERVICE MANUAL
3. TDA8944J
2 X 7 W STEREO BRIDGE TIED LOAD (BTL) AUDIO AMPLIFIER
1). General descriptio
n
The TDA8944J is a dual-channel audio power amplifier with an output power of
2
×
7 W at an 8
Ω
load and a 12 V supply. The circuit contains two Bridge Tied Load
(BTL) amplifiers with an all-NPN output stage and standby/mute logic. The TDA8944J
comes in a 17-pin DIL-bent-SIL (DBS) power package. The TDA8944J is
printed-circuit board (PCB) compatible with all other types in the TDA894x family.
One PCB footprint accommodates both the mono and the stereo products.
2). Features
❷
Few external components
❷
Fixed gain
❷
Standby and mute mode
❷
No on/off switching plops
❷
Low standby current
❷
High supply voltage ripple rejection
❷
Outputs short-circuit protected to ground, supply and across the load
❷
Thermally protected
❷
Printed-circuit board compatible.
3). Block diagram
Fig 13. Block diagram.
32