akira LCT-20CH01ST, Service Manual

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Model No.:LCT-20CH01ST.doc
Version:1.0 46
5
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TDA8944J brief introduction:
TDA8944J is a dual channel sound power amplifier, with each channel has 7W power output (the resistance
of the loudspeaker is 8
Ω
) to drive the loudspeaker; When music is played, its high efficiency could reduce
external heat dispersion and the requirement of the power supply equipment.
Its main features:
● High integration
● Standby and mute mode
● No switch switching noise
● 12V Power filtering
● Low working current
● Output current short-circuit grounding protection
● Overheat protection
● Linear output to drive external earphone, PC and portable audio equipment
Pin introduction:
Pin Designation Function Description
1 OUT1  Loudspeaker negative pole output terminal 1
2 GND1 Ground
3 VCC1 +12V Power
4 OUT1  Loudspeaker positive output terminal 1
5 N.C. No connection
6 IN1  Positive pole input terminal 1
7 N.C. No connection
8 IN1  Negative pole input 1
9 IN2  Negative pole input 2
10 MODE Operation mode selection (standby, mute, work)
11 SVR Voltage decoupling filtering (grounding)
12 IN2  Positive pole input terminal 2
13 N.C. No connection
14 OUT2  Loudspeaker negative output terminal 2
15 GND2 Ground
16 VCC2 +12V Power
17 OUT2+ Loudspeaker positive output terminal 2