Active Clamp Synchronous Forward Controllers with Internal Housekeeping Controller

The LT3752/LT3752-1 are current mode PWM controllers optimized for an active clamp forward converter topology. A DC/DC housekeeping controller is included for improved efficiency and performance. The LT3752 allows operation up to 100V input and the LT3752-1 is optimized for applications with input voltages greater than 100V.

A programmable volt-second clamp allows primary switch duty cycles above 50% for high switch, transformer and rectifier utilization. Active clamp control reduces switch voltage stress and increases efficiency. A synchronous output is available for controlling secondary side synchronous rectification.

The LT3752/LT3752-1 are available in a 38-lead plastic TSSOP package with missing pins for high voltage spacings.

Applications

* Offline and HV Car Battery Isolated Power Supplies

* 48V Telecommunication Isolated Power Supplies

* Industrial, Automotive and Military Systems

* Input Voltage Range: LT3752: 6.5V to 100V, LT3752-1:Limited Only by External Components

* Internal Housekeeping DC/DC Controller

* Programmable Volt-Second Clamp

* High Efficiency Control: Active Clamp, Synchronous Rectification, Programmable Delays

* Short-Circuit (Hiccup Mode) Overcurrent Protection