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IC BLOCK DIAGRAM & DESCRIPTION
IC490(STR-A6151 Switching Regulator )
Startup
5
OFF Timer
O.V.P=
Overvoltage protection circuit
T.S.D=
Thermal shutdown circuit
Function of Terminal
Pin No.
Sym.
1
Source/O.C.P
2
Vcc
3
GND
FB/O.L.P
4
5
Startup
6
N.C.
7
D
8
IC492 KIA431(Voltage CTL)
Reference
(R)
2.5Vref
1
VREF
2
Anode
3
Cathode
1
2 3
UVLO
+
Internal
-
Bias
PWM Latch
+
S Q
-
R
Bias -
+
+
-
Burst
FB
-
+
Description
Source/O.C.P termina
Power Supply terminal
Ground terminal
Feedback/O.L.P
terminal
Startup terminal
-
Drain terminal
Cathode
+
(K)
-
Anode
(A)
LATCH
DELAY
OLP
+
-
Discharge
4
FB/OLP
Function
MOS FET source/Over current protect
Input of power supply for control circuit
Ground
Input of constant voltage control signal
/overload protection signal
Input of Startup current
Not Connected
MOSFET drain
IC493 PQ1X501M2Z(Regulator)
DC input : Vin
1
GND
2
3
ON/OFF control : Vc
- 28 -
2
OVP
+
-
TSD
8
D
Power
MOS FET
D
7
Drive
Blanking
OCP
+
Source/OCP
1
-
Buffer
3
GND
DC output : Vo
5
CONTROL
Noise reduction : Nr
4
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