This document is about L6566B multi-mode controller. It features selectable multi-mode operation, on-board high-voltage start-up, advanced light load management, low quiescent current, adaptive undervoltage lockout, line feedforward for constant power capability vs mains voltage, pulse-by-pulse overcurrent protection, transformer saturation detection, programmable frequency modulation for EMI reduction, overvoltage protection, brownout protection, and -600/+800 mA totem pole gate driver.
The L6566B is an extremely versatile current-mode primary controller IC specifically designed for high-performance offline flyback converters. It supports both fixed-frequency (FF) and quasi-resonant (QR) operation modes, allowing users to select the mode depending on application needs. The device features an externally programmable oscillator that defines the switching frequency in FF mode and the maximum allowed switching frequency in QR mode.
| Maximum Vcc voltage | 700 V |
|---|---|
| Maximum duty cycle | 70 % |
| Quiescent current | < 3 mA |
| Gate driver peak current | 800 mA |
The device supports both fixed-frequency (FF) and quasi-resonant (QR) operation modes.
Yes, the device features an externally programmable oscillator.
The maximum duty cycle is limited at 70% minimum.