The L6565 is a current-mode primary controller IC, specifically designed to build offline Quasi-resonant ZVS (Zero Voltage Switching at switch turn-on) fly- back converters. Quasi-resonant operation is achieved by means of a transformer demagnetization sensing input that triggers MOSFET's turn-on.
The L6565 is a current‑mode primary controller IC designed for offline quasi‑resonant flyback converters. It features line‑voltage feed‑forward, frequency fold‑back for standby efficiency, ultra‑low start‑up and quiescent currents, and a disable function.
The document provides detailed pin descriptions, thermal and electrical characteristics, internal block diagrams, and application information for TV/monitor adapters, printers, fax machines, photocopiers, scanners and other AC‑DC adapters.
| Supply voltage range (VEE) | 10.3 V – 18 V |
|---|---|
| Start‑up current (Istart‑up) | 45 µA – 70 µA |
| Quiescent current (Iq) after turn‑on | 2.3 mA – 3.5 mA |
| Peak gate‑driver output current | 700 mA |
| Maximum power dissipation (Ptot) | 1 W |
| Junction‑to‑ambient thermal resistance (Rth j‑amb) | 100 °C/W – 150 °C/W |
The start‑up current before turn‑on with a 12 V supply is between 45 µA and 70 µA.
The totem‑pole gate driver can source or sink up to 700 mA of peak current.
Pulling the ZCD pin voltage below 150 mV shuts down the device.
The quiescent current after turn‑on is specified as 2.3 mA to 3.5 mA.