Changhong Electric PF2939, Service Manual, Page: 18 / 47

SERVICE MANUAL
16
TDA8944J (N361)
Audio Power Amplifier
1. General Description
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
·
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
·
Printed-circuit board compatible.
3.Block Diagram
Pinning
5. Refer to Table 6 about Functions and Service Data of TDA8944J’s Pins.
Fig.9 Block Diagram
Fig.10 Pin configuration.