LTC3725 Datasheet | Linear Technology

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 U APPLICATIO S - Isolated 48V Telemunication Systems - Internet Servers and Routers - Distributed Power Step-Down Converters - Automotive and Heavy Equipment Single-Switch Forward Controller and Gate Driver DESCRIPTIO The LTC®3725 is a controller for a single-switch forward converter and includes an on-chip gate driver. For secondary-side control, bine the LTC3725 with the LTC3706 Poly Phase® secondary-side synchronous forward controller to create a plete 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. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Poly Phase is a registered trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Patent Pending TYPICAL APPLICATIO VIN+ 36V TO 72V 1µF 100V ×2 VIN- 36V-72V to 3.3V/30A Isolated Single-Switch Forward Converter T1 - -...