KA3501

KA3501 Datasheet

KA3501

Part	Datasheet
KA3501	KA3501 (pdf)

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KA3501 PC SMPS Supervisory IC • 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 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 Internal Block Diagram Vcc1 +5V Vin1 Vin2 GATE POSITIVE VOLTAGE PROTECTION NEGATIVE VOLTAGE PROTECTION Feedback Vref +2.5V REFERENCE VOLTAGE Vcc2 +12V Vcont START UP INTERNAL BIAS 2000 Fairchild Semiconductor International +5V DETECTING Ichg COMP DETECTING COMP Timing KA3501 Pin Assignments #1 Vcont #14 Feedback Vref Vcc2 Vcc1 Vin2 Tim ing Gate Vcc #7 Vin1 #8 Pin Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Pin Name Vcont Vref Vcc2 Vcc1 Vin2 Gate Vcc Vin1 Td Timing PG Ve GND Feedback Pin Function Descrition Reference Voltage Control Precision Reference Voltage +12V Output Voltage +5V Output Voltage UVP Input Negative Gate Drive Input for SCR Supply Voltage PG Input Reference Voltage Delay for PG Delay PG Output PG Ground Open Emitter Ground Feedback for Precision Reference Ordering Information Product Number KA3501 Package 14-DIP Operating Temperature 0°C ~ +70°C KA3501 KA3501 DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR INTERNATIONAL. As used herein: Life support devices or systems are devices or systems which, a are intended for surgical implant into the body, or b support or sustain life, and c whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. 9/25/00 0.0m 001 2000 Fairchild Semiconductor International

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KA3501

PC SMPS Supervisory IC
• 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

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

Internal Block Diagram

Vcc1 +5V

Vin1

Vin2 GATE

POSITIVE VOLTAGE PROTECTION

NEGATIVE VOLTAGE PROTECTION

Feedback Vref
+2.5V REFERENCE

VOLTAGE

Vcc2 +12V

Vcont

START UP INTERNAL

BIAS
2000 Fairchild Semiconductor International
+5V DETECTING

Ichg

COMP

DETECTING

COMP

Timing

KA3501

Pin Assignments
#1 Vcont
#14 Feedback

Vref

Vcc2

Vcc1

Vin2

Tim ing

Gate

Vcc #7

Vin1 #8

Pin Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14

Pin Name Vcont Vref Vcc2 Vcc1 Vin2 Gate Vcc Vin1 Td Timing PG Ve GND

Feedback

Pin Function Descrition Reference Voltage Control Precision Reference Voltage +12V Output Voltage +5V Output Voltage UVP Input Negative Gate Drive Input for SCR Supply Voltage PG Input Reference Voltage Delay for PG Delay PG Output PG Ground Open Emitter Ground Feedback for Precision Reference
Ordering Information

Product Number KA3501

Package 14-DIP

Operating Temperature 0°C ~ +70°C

KA3501

KA3501

DISCLAIMER

FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.

LIFE SUPPORT POLICY

FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR INTERNATIONAL. As used herein:

Life support devices or systems are devices or systems which, a are intended for surgical implant into the body, or b support or sustain life, and c whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user.

A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
9/25/00 0.0m 001 2000 Fairchild Semiconductor International

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Datasheet ID: KA3501 634109