The L6566A is a multi-mode controller for SMPS with PFC front-end. It offers multiple selectable operation modes including fixed frequency and quasi-resonant mode. It also features 700 V high-voltage startup, advanced light load management, low quiescent current (< 3 mA), adaptive UVLO, line feedforward for constant power capability vs. mains voltage, pulse-by-pulse OCP, shutdown on overload (latched or autorestart), transformer saturation detection, switched supply rail for PFC controller, latched or autorestart OVP, brownout protection and a -600/+800 mA totem pole gate driver with active pull-down during UVLO.
The L6566A is a versatile current‑mode primary controller designed for high‑performance offline flyback converters with a front‑end Power Factor Correction stage. It supports both fixed‑frequency and quasi‑resonant operation, offers a 700 V high‑voltage start‑up generator, low quiescent current and adaptive UVLO, and includes multiple protection functions such as brownout, OVP and OCP.
The document contains sections on description, pin settings, electrical data, electrical characteristics, application information, package mechanical data, order codes and revision history, providing the necessary details for designers to implement the device in their power‑supply designs.
| High‑voltage start‑up pin rating | 700 V |
|---|---|
| Quiescent current | < 3 mA |
| Maximum duty cycle (FF mode) | 70 % |
| Gate driver peak current | 800 mA source/sink |
Both Fixed‑frequency (FF) and Quasi‑resonant (QR) operation are supported.
The device includes a non‑latched input undervoltage (brownout) protection.
It can withstand 700 V and is tied directly to the rectified mains voltage to start up the converter.