L6566B multi-mode controller for SMPS
The L6566B is an extremely versatile current‑mode primary controller designed for high‑performance offline flyback converters and single‑stage PFC applications. It supports both fixed‑frequency (FF) and quasi‑resonant (QR) operation, includes an externally programmable oscillator, and provides features such as adaptive UVLO, pulse‑by‑pulse OCP, and latched or auto‑restart OVP.
The device offers a 700 V on‑board high‑voltage start‑up generator, low quiescent current (< 3 mA), a 600/ +800 mA totem‑pole gate driver, and is supplied in an SO16N package. Pin settings, protection functions, and application examples are detailed for designers of AC‑DC adapters, LCD TV/monitor power supplies, and other SMPS solutions.
| High‑voltage start‑up | 700 V |
|---|---|
| Quiescent current | < 3 mA |
| Adaptive UVLO | Enabled |
| Over‑current protection (OCP) | Pulse‑by‑pulse, shutdown on overload |
| Over‑voltage protection (OVP) | Latched or auto‑restart |
| Gate driver current | 600/ +800 mA |
| Package | SO16N |
| Maximum duty cycle (FF mode) | 70 % |
It supports both fixed‑frequency (FF) and quasi‑resonant (QR) operation.
The quiescent current is less than 3 mA.
The totem‑pole gate driver can source and sink up to 800 mA (600 mA sinking, 800 mA sourcing).
It includes an on‑board 700 V high‑voltage start‑up generator.