The L6566B is a versatile current‑mode primary controller designed for high‑performance offline flyback converters and single‑stage PFC applications. It supports both fixed‑frequency and quasi‑resonant operation, offers an on‑board 700 V high‑voltage start‑up generator, low quiescent current, adaptive UVLO, and a range of protection functions.
The manual includes a description of the device, pin settings and functions, electrical ratings and characteristics, application information with example schematics, mechanical package data, ordering codes, and revision history. It is intended for designers and engineers who need detailed implementation guidance for the L6566B controller.
| High‑voltage start‑up voltage rating | 700 V |
|---|---|
| Quiescent current | < 3 mA |
| Gate driver peak current | 800 mA source/sink |
| Maximum duty cycle (FF mode) | 70 % min |
| Adaptive UVLO | Enabled |
The start‑up pin can withstand up to 700 V.
The device draws less than 3 mA in quiescent mode.
It can source or sink up to 800 mA.
The duty cycle is limited to a minimum of 70 %.