The LT3825 is an isolated switching regulator controller designed for medium power flyback topologies. It features sensing output voltage directly from the primary side winding without an optoisolator, improving dynamic response and reliability. It also has synchronous rectification to increase converter efficiency and improve output cross regulation in multiple output converters. The LT3825 operates in forced continuous conduction mode, improving cross regulation.
The LT3825 is an isolated switching regulator controller designed for medium‑power flyback topologies (10 W to 60 W). It features direct primary‑side voltage sensing, programmable undervoltage lockout, and synchronous rectification for high efficiency.
The document provides absolute maximum ratings, electrical characteristics, pin functions, typical performance curves, package details, and a list of related parts. It is intended for designers who need detailed specifications and layout guidance for implementing the LT3825 in isolated power supplies.
| Operating Junction Temperature Range | -40 °C to 125 °C |
|---|---|
| Package | 16‑Lead Plastic TSSOP (4.4 mm) |
| Supply‑Pin Clamp Voltage | 19.5 V |
Pin 1 provides a synchronous gate‑drive output for the secondary‑side switch.
The device is rated for operation from –40 °C up to 125 °C.
It is supplied in a 16‑lead plastic TSSOP package.