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IC492 KIA431(Voltage CTL)
Anode
(A)
Cathode
(K)
Reference
(R)
2.5Vref
+
-
1
1 VREF
2 Anode
3 Cathode
2 3
1
5
3
4
2
CONTROL
DC output : Vo
DC input : Vin
ON/OFF control : Vc
GND
Noise reduction : Nr
IC493 PQ1X501M2Z(Regulator)
IC BLOCK DIAGRAM & DESCRIPTION
IC490(STR-A6151 Switching Regulator )
5
4
1
3
OVP
TSD
LATCH
DELAY
Discharge
Drive
S Q
R
UVLO
Startup
Internal
Bias
Buffer
Blanking
+
+
-
+
-
-
+
-
+
-
Burst
+
-
Bias -
+
OCP
OLP
+
-
PWM Latch
OFF Timer
2
Source/OCP
8
D
7
D
GND
FB/OLP
Pin No.
Sym.
Description
Function
Function of Terminal
1
2
3
Source/O.C.P termina
Feedback/O.L.P
terminal
MOS FET source/Over current protect
Input of power supply for control circuit
Input of constant voltage control signal
/overload protection signal
Source/O.C.P
Vcc
GND
FB/O.L.P
D
5
6
7
8
4
Power Supply terminal
Startup
N.C.
Startup terminal
-
Drain terminal
MOSFET drain
Input of Startup current
Not Connected
Overvoltage protection circuit
Thermal shutdown circuit
O.V.P=
T.S.D=
FB
Power
MOS FET
Ground terminal
Ground