Power chip

The NCP4308 is a synchronous rectifier controller for switch mode power supplies. The controller enables energy-efficient designs for flyback, quasi-resonant flyback, and LLC topologies. An externally adjustable minimum switching interval period provides the flexibility to drive various MOSFET encapsulation types and PCB layouts. Reliable low-noise operation of the SR system is guaranteed due to the self-synchronization function. The NCP4308 also utilizes the Kelvin connection of the driver to the MOSFET for high efficiency operation at full load. The driver's precise turn-off threshold, very low turn-off delay time, and high sink current capability enable the longest synchronous rectification MOSFET turn-on time. This high accuracy driver and 5V gate clamp make it ideal for directly driving GaN devices. To provide greater flexibility in PCB layout, this product is available in two versions. NCP4308 has no LLD function, NCP43080 has LLD function

UC3572 Inverting Flyback Pulse Width Modulator with Undervoltage Lockout Circuit