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Active Clamp Forward Controller and Gate Driver
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LTC3765
Active Clamp Forward
Controller and Gate Driver
FEATURES n n n n n n n n DESCRIPTION Supports Self-Starting Secondary-Side Control
Direct Flux Limit™ Guarantees No Saturation
Active Clamp Drive with Delay Adjustment
On-Chip Bridge Rectifier Eliminates Need for
Separate Gate Drive Bias Supply
Wide Input Supply Range: 8V and Up (Limited Only
by External Components)
Linear Regulator Controller for Fast Start-Up
High Speed Gate Drivers
Precision UVLO with Adjustable Hysteresis
Overcurrent Protection
Overtemperature Protection
Adjustable Start-Up Frequency and Soft-Start
Tiny 16-Lead MSOP Package The LTC®3765 is a start-up controller and gate driver for
use in a self-starting secondary-side control forward converter. When combined with the LTC3766 secondary-side
synchronous forward controller, a complete isolated power
supply is created using a minimum of discrete parts. A
proprietary scheme is used to multiplex gate drive signals
and bias power across the isolation barrier through a
small pulse transformer. The LTC3765 contains an onchip bridge rectifier that extracts gate drive bias power …
