DESCRIPTION
The LTC®3725 is a controller for a single-switch forward converter and includes an on-chip gate driver.
For secondary-side control, combine the LTC3725 with the LTC3706 PolyPhase® secondary-side synchronous forward controller to create a complete forward converter using a minimum of discrete parts. A proprietary scheme is used to multiplex gate drive signals across the isolation barrier through a tiny pulse transformer. The on-chip rectifier and the same pulse transformer provide gate drive bias power.

FEATURES
■ High Speed Gate Driver for Forward Converter
■ On-Chip Rectifier and Self-Starting Architecture
   Eliminates Need for Separate Gate Drive Bias
   Supply
■ Wide Input Voltage Supply Range: 9V and Up
■ Linear Regulator Controller for Fast Start-Up
■ Precision UVLO with Adjustable Hysteresis
■ Overcurrent Protection
■ Volt-Second Limit Prevents Transformer Core
   Saturation
■ Voltage Feedforward for Fast Transient Response
■ Available in 10-Lead MSOP Package

APPLICATIONS
■ Isolated 48V Telecommunication Systems
■ Internet Servers and Routers
■ Distributed Power Step-Down Converters
■ Automotive and Heavy Equipment