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