L6566A is a multi-mode controller from STMicroelectronics, suitable for SMPS power supplies with PFC front-end.
The L6566A is an extremely 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 (FF) and quasi‑resonant (QR) operation, offers an externally programmable oscillator, and includes adaptive UVLO, burst‑mode at light load, and a range of protection functions.
Key features include a 700 V on‑board high‑voltage start‑up circuit, low quiescent current (< 3 mA), a 600/800 mA totem‑pole gate driver, and a SOI16N package. The device provides line feed‑forward for constant power capability, brownout protection, and programmable soft‑start, making it suitable for notebooks, TV adapters, high‑power chargers, and other consumer appliances.
| On‑board high‑voltage start‑up voltage | 700 V |
|---|---|
| Quiescent current | < 3 mA |
| Gate driver peak current | 800 mA source/sink |
| Package | SOI16N |
| Maximum duty cycle (FF mode) | 70 % |
| Adaptive UVLO | Enabled |
The maximum duty cycle is limited to 70 %.
The gate driver can source and sink up to 800 mA.
The on‑board start‑up circuit is rated for 700 V.
The quiescent current is less than 3 mA.