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LTC3725 - Single-Switch Forward Controller and Gate Driver

The LTC3725 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.

Alternatively, the LTC3725 can be used as a standalone voltage mode controller in a primary-side control architecture with optoisolator feedback. Voltage feedforward provides excellent line regulation and transient response.

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 Typical Application

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

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