Synchronous Rectification Controller 12.5 W (5 V / 2.5 A) Power Supply

A controller that improves the efficiency of the secondary-side synchronous rectifier (SR) MOSFET. An internal shunt regulator with low bias current and an internal charge pump circuit reduce external component count, total cost, and system power consumption. The adoption of an internal charge pump circuit enables the FAN6230A to work very well under low bias voltage conditions with good constant current (CC) regulation without the need for a rectifier diode. The FEBFAN6230AMPX-CH04U12A-GEVB also features adjustable cable compensation for accurate constant voltage regulation at the end of the cable. Unlike the traditional method of measuring the SR MOSFET drain-source voltage to sense the current, the FEBFAN6230AMPX-CH04U12A-GEVB uses an innovative linear predictive timing control (LPC) to estimate the current, which is sensitive to noise caused by poor PCB layout and the SR MOSFET turn-on time, without the need for additional current sensing circuitry. In Green Mode, the FEBFAN6230AMPX-CH04U12A-GEVB turns off the SR MOSFET, which reduces the bias current to 500 μA, further reducing the total power consumption of the system. Features and Application Characteristics 16-pin MLP33 package Ultra-low Green Mode operating current (0.5 mA typical) Ultra-low VDD operating voltage for 5 V output applications PWM frequency tracking using secondary winding voltage Output cable compensation circuit Green Mode improves light-load efficiency and no-load power consumption Integrated charge pump circuit in CC region Smooth operation in DCM and CCM Secondary-side SR controller for flyback converter Integrated shunt regulator Advanced protection RES brownout protection (disable gate drive) Over-temperature protection (auto-restart)