LLC Resonant, 250 W, 400 V to 12.5 V Converter, Evaluation Board

Overview

A secondary-side LLC resonant pulse frequency modulation (PFM) controller with dedicated synchronous rectification (SR) gate drive provides best-in-class efficiency for isolated DC/DC converters. The primary resonant current is sensed and integrated to employ a type of peak current mode control called charge control. The integrated resonant current is combined with a triangle wave generated by an internal oscillator to determine the switching frequency. This provides better control of the power stage to the output transfer function, making feedback loop design easy and allowing true input power limiting capability. The FAN7688 also integrates a closed-loop soft-start function that uses an adaptive soft-start current to prevent error amplifier saturation, allowing a monotonic startup output voltage independent of the load current. Dual-edge tracking adaptive SR drive technology minimizes body diode conduction of the SR MOSFET, thereby maximizing overall efficiency.

Design Files

febfan7688_i00250a[1].pdf

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Update:2025-06-19 03:10:33

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