This application note introduces Fairchild Power Switch™ (FPS™) FSL-1x7 series of high-integration current-mode PWM controller, which features high voltage 700V sense FET, can provide high performance, high reliability and low cost solutions for various small power switch power supply applications. This application note details the FSL-1x7's various functional modules, including start-up circuit, soft start circuit, over current protection circuit, over voltage protection circuit, over temperature protection circuit and harmonic suppression circuit.
The document describes the Fairchild FSL series, a high-integration PWM controller designed for offline switch-mode power supplies (SMPS). Key features include a current-mode control with avalanche-rated 700V sense FBT, a Green Mode function that linearly reduces switching frequency under light loads to minimize standby power, and a proprietary line correction circuit for wide AC input ranges. This manual is written in Japanese.
| Standby current (Green Mode) | 2mA |
|---|---|
| Over-voltage protection trigger | 28V |
| Thermal shutdown threshold | 142°C |
| Over-load protection delay | 56ms |
The standby current is 2mA in Green Mode.
The over-voltage protection triggers when Vpp reaches 28V.
Thermal shutdown occurs when the junction temperature exceeds approximately 142°C.