- 26 -
IC BLOCK DIAGRAM & DESCRIPTION
IC410,411 PQ1CG21H2RZ(Chopper Regulator)
+
-
+
-
1
2
5
4
3
Overcurrent
detection
circuit
Overheat
detection
circuit
COM
V
IN
V
OUT
ON/OFF
Oadj
OSC
ON/OFF
Circuit
Soft start
Constant-
voltage
circuit
Q
R
S
IC412 KA7805R(Voltage Regulator)
CURRENT
GENERATOR
REFERENCE
VOLTAGE
STARTING
CIRCUIT
ERROR
AMPLIFIER
SOA
PROTECTION
THERMAL
PROTECTION
SERIES
PASS
ELEMENT
1
INPUT
3
OUTPUT
2
GND
IC450,460 NJM4558(Operational Amplifier)
1
A: OUT
A: -IN
A: +IN
V
EE
2
3
4
8
Vcc
B: OUT
B: -IN
B: +IN
7
6
5
B
A
IC161 BA10358(Operational Amplifier)
4
3
2
1
5
6
7
8
+IN2
-IN2
OUT2
V
CC
GND
+IN1
-IN1
OUT1
+
-
+
-
1
2
IC453,455 KTC801U-Y(Switching Transistor)
Q1
Q2
1
6
2
5
3
4