This document introduces the Fairchild Power Switch(FPS) product family, which is specially designed for off-line SMPS with minimal external components. The product includes high voltage power SenseFET and current mode PWM IC. Compared to discrete MOSFET and controller or RCC switching converter solution, the included PWM controller features integrated fixed oscillator, under voltage lock out, leading edge blanking, optimized gate turn-on/ turn-off driver, thermal shut down protection, over voltage protection, and temperature compensated precision current sources for loop compensation and fault protection circuitry. The product can reduce total component count, design size, weight and at the same time increase efficiency, productivity, and system reliability. It has a basic platform well suited for cost-effective design in either a flyback converter or a forward converter.
The Fairchild KA5x02xx series Power Switch (FPS) family is designed for off‑line SMPS applications with minimal external components. The devices integrate a high‑voltage sense FET and a current‑mode PWM controller, providing features such as fixed operating frequency, pulse‑by‑pulse current limiting, over‑load and over‑voltage protection, and thermal shutdown.
The datasheet lists absolute maximum ratings, detailed electrical parameters for both the SFET and control sections, typical performance curves, package dimensions, and ordering codes for the various device variants (e.g., KA5H0265RC, KA5M0280R). It also includes a disclaimer and life‑support policy notice.
| Gate‑Source Voltage (VGS) | 30 V |
|---|---|
| Continuous Drain Current (Tc=25 °C) | 2.0 A |
| Maximum Duty Cycle | up to 82 % (KA5M0280R) |
| Operating Junction Temperature (TJ) | 160 °C |
The KA5M0280R variant is rated for a drain‑gate voltage of 800 V.
The ordering code for KA5H0265RC is KASHORESRCTU, with a TO‑220‑5L (Forming) package.