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KA3501

PC SMPS Supervisory IC
Features
Complete House Keeping Circuit Few External Components Positive Voltage Protection Negative Voltage Protection High Current Drive Output for SCR Precision Voltage Reference for 5V/12V Outputs Power Good Signal Generator with Hysteresis

Description
The KA3501 is complete housekeeping circuits for use in the secondary side of SMPS(Switched Mode Power Supply). This IC(Integrated Circuit) contains a precision voltage reference, protection circuits and a power good signal generator. It also has a high current drive output for use in conjunction with an external "crowbar" SCR. The reference voltage is trimmed to 2% for correct output voltages( 5V/ 12V) and power good signal generator is to monitor the voltage level of power good supply for safe operation in a microprocessor circuit. Using the KA3501 requires few external components to accomplish a complete housekeeping circuit for SMPS(Switched Mode Power Supply). The KA3501 is available in an 14-pin DIP.
14-DIP

1

Internal Block Diagram
4 VCC1( 5V) VCC 7 8 Vin1

Positive Voltage Protection

START UP

5V Detecting COMP

lchg

Vin2 5 GATE 6 Feedback 14 2 Vref

Negative Voltage Protection

11 PG

INTERNAL BIAS

VCC Detecting COMP 2.5V REFERENCE VOLTAGE

12 Ve

VCC2( 12V)

3

1 Vcont

13 GND

9

Td

10 Timing

Rev. 1.0.2
2002 Fairchild Semiconductor Corporation

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KA3501 DATASHEET