Fairchild KA5x03xx Series Data Handbook
Summary
Technical datasheet for Fairchild KA5L0365R/KA5M0365R/KA5L0380R/KA5M0380R Fairchild Power Switch (FPS) family specially designed for offline SMPS (Switched-Mode Power Supplies) with minimal external components. Features internal high-voltage startup circuitry eliminating power loss from bleeding resistors, precision fixed operating frequency (100kHz for KA5x0365R, 67kHz for KA5x0380R), low operating current (4mA typical), linearly decreasing PWM frequency to 18kHz in green-mode for light-load co
Page 1 Text Content
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KA5x03xx-SERIES KA5H0365R, KA5M0365R, KA5L0365R, KA5M0365RN, KA5L0365RN, KA5H0380R, KA5M0380R, KA5L0380R Fairchild Power Switch(FPS) Features Description Precision Fixed Operating Frequency (100/67/50k Hz) The Fairchild Power Switch(FPS) product family is specially Low Start-up Current(Typ. 100u A) designed for an off-line SMPS with minimal external Pulse by Pulse Current Limiting components. The Fairchild Power Switch(FPS) consists of a Over Current Protection high voltage power Sense FET and a current mode PWM IC. Over Voltage Protection (Min. 25V) Included PWM controller integrates the fixed frequency Internal Thermal Shutdown Function oscillator, the under voltage lock-out, the leading edge Under Voltage Lockout blanking, the optimized gate turn-on/turn-off driver, the Internal High Voltage Sense FET thermal shutdown protection, the over voltage protection, Auto-Restart Mode and the temperature compensated precision current sources
for the loop compensation and the fault protection circuitry. Compared to a discrete MOSFET and a PWM controller or
Applications
an RCCsolution, a Fairchild Power Switch(FPS) can reduce
SMPS for VCR, SVR, STB, DVD & DVCD the total component count, design size and weight and at the SMPS for Printer, Facsimile & Scanner same time increase efficiency, productivity, and system Adaptor for Camcorder reliability. It has a basic platform well suited for the cost
effective design in either a flyback converter or a forward converter TO-220F-4L 8-DIP
1.6.7.8 Drain 2. GND 1. GND 2. Drain 3. VCC 4. FB 3. VCC 4. FB 5. NC
Internal Block Diagram
#3 VCC
32V #2 DRAIN
5V Internal
Vref bias SFET
(*#3 VCC)
logic (*#1.6.7.8 DRAIN)
#4 FB
(*#4 FB)
7.5V #1 GND
Thermal S/D
Power on reset (*#2 GND)
OVER VOLTAGE S/D
*Asterisk - KA5M0365RN, KA5L0365RN
Rev.1.0.5
©2002 Fairchild Semiconductor Corporation
Page Summary Contents For Fairchild KA5x03xx Series Data Handbook
Manual Details
| Brand | Fairchild |
|---|---|
| Pages | 20 |
| File Size | 945.93 KB |
| Published | July 07, 2026 |
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Frequently Asked Questions
What is the primary application for the FPS product family?
It is suitable for off-line SMPS applications like VCR, DVD & DVCD, Printer, Facsimile & Scanner adaptor for Camcorder.
Which features are integrated into the PWM controller?
The controller integrates fixed frequency oscillator, over current protection, over voltage protection, internal thermal shutdown, and under voltage lock-out/blanking.
What is the maximum drain voltage for the KA5X0365 series?
The Maximum Drain Voltage (Vd,MAX) for this series can reach 650 V.
Are these products suitable for life support systems?
No, Fairchild’s products are not authorized for use as critical components in life support devices without express written approval.