KA3501 Datasheet | Fairchild Semiconductor

.fairchildsemi. PC SMPS Supervisory IC Features - - - - - - - plete House Keeping Circuit Few External ponents 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 plete 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 ponents to acplish a plete housekeeping circuit for SMPS(Switched Mode Power Supply). The KA3501 is available in an 14-pin DIP. 14-DIP Internal Block Diagram 4 VCC1(+5V) VCC 7 8 Vin1 Positive Voltage Protection START UP +5V Detecting P lchg Vin2 5 GATE 6 Feedback 14 2 Vref Negative Voltage Protection 11 PG INTERNAL BIAS VCC Detecting P +2.5V REFERENCE VOLTAGE 12 Ve VCC2(+12V) 1 Vcont 13 GND Td 10 Timing Rev. 1.0.2 ©2002 Fairchild Semiconductor Corporation Pin Assignments #1 Vcont Vref Vcc2 Vcc1 Vin2 Gate Vcc #7 #14 Feedback...