DC2175A: 12V @ 13A, 9 ~ 36V in, Buck/Boost

Demonstration circuit 2175A is an active clamp forward converter with synchronous rectification featuring the LT®3752/LT8311 chipset.

This circuit was designed to demonstrate the high levels of performance, efficiency and high power. It operates at 200kHz and produces a regulated 12V at 13A output from a wide input voltage range of 9V to 36V, making it well suited for automotive, industrial, and military applications. Synchronous rectification helps to attain an efficiency exceeding 93%.

The DC2175 circuit features soft-start which prevents output voltage overshoot on startup or when recovering from overload condition.

The DC2175 also has a precise overcurrent protection circuit that allows for continuous operation under short circuit conditions. The low power dissipation under a short circuit ensures high reliability even during prolonged short circuit conditions.

The LT3752 includes an internal constant frequency flyback controller for creating a housekeeping voltage supply. The housekeeping supply is able to efficiently provide bias for both primary and secondary ICs, and eliminates the need to generate bias supplies from auxiliary windings in the main forward transformer. The housekeeping supply also allows bias to any secondary side IC before the main forward converter starts switching.

Please refer to the LT3752 data sheet for design details and applications information.