Casio CTK-650 manual Power AMPLIFIERLA4598

POWER AMPLIFIER(LA4598)

LA4598 is 2-channel power amplifier with standby switch.

Pin No.	Terminal	In/Out	Function
1	Power GND	In	Ground(0V) source.
2	Ch1 B.S.	-	Terminal for bootstrap capacitor.
3	Ch1 OUT	Out	Channel 1 output.
4	VCC	In	+9V source.
5	Ch1 N.F.	In	Negative feedback input.
6	Ch1 IN	In	Channel 1 input.
7	D.C.	-	Terminal for decoupling capacitor.
8	Pre GND	In	Ground(0V) source.
9	Standby	In	Control signal input. 0V:OFF / +9V:ON
10	Ch2 IN	In	Channel 2 input.
11	Ch2 N.F.	In	Negative feedback input.
12	Ch2 OUT	Out	Channel 2 output.
13	Ch2 B.S.	-	Terminal for bootstrap capacitor.
14	NC	-	Not used.

INTERNAL BLOCK DIAGRAM

Ch1 IN 6

Ch1 NF 5

Pre GND 8

Input AMP.

Pre-drivePower

AMP.AMP.

TSD protector

2CH2 BS

3CH1 OUT

1POWER GND

4VCC

D.C. 7 Bias circuit

Ch2 IN 10Input

AMP.

CH2 NF 11

Stand by 9 STAND BY

Pre-drive	Power	12	CH2 OUT
	AMP.
AMP.

13 CH2 BS

— 6 —