Mitsubishi SL2U Service Manual page 81

PCB-AUDIO
PCB-POWER
FEEDBACK
IC390 LA4525
6
CH2 in
CH2
INPUT
5
AMP
BTL IN
R12
RNF2
8
SMALL SIGNAL
GND
RNF1
R11
CH1
INPUT
7
AMP
CH1 in
IC901 MC33232D
Zero-current
detection
2.5V
Reference
Timer
one-shot
Overvoltage
detection
1.067Vref
3
Mult
6
GND
IC907 LM2594M-5.0
CURRENT
1.235V
SOURCE
REFERENCE REGULATOR
BIAS
4
GM
R2
AMP
R1 = 2.5k
ACTIVE
CAPACITOR
OP AMP
3.3V,R2 = 4.2k
5V,R2 = 7.6k
12V,R2 = 21.8k
ADJ,R2 = 0Ω
R1 = OPEN
Vcc
2
PRE
OUTPUT
DRIVE
AMP
AMP
PRE
OUTPUT
DRIVE
AMP
AMP
8
Vcc
1.4V
28V
5
ZCD
5.3V
1.6V
/1.4V
POR
UVLO
7
Output
16V
TSD
Current
detection 5K
4
CS
2p
1.5V
Vref
Multiplier
1
VFB
Err Amp
Quickstart
2
COMP
ON/OFF
5
2.5V START
UP
COMP.
2.5V
CURRENT
LIMIT
COMP.
COMP.
LATCH
RESET
FREQ. SHIFT
150kHz TERMINAL
OSC.
B-6
3
CH2 out
4
LARGE SIGNAL
GND
1
CH1 out
220mV 200mV
7
V
IN
0.5A
SWITCH
DRIVER
8
OUTPUT
6
GND
LIMIT