NCP4302

NCP4302 Secondary Side Synchronous Flyback Controller The NCP4302 is a full featured controller and driver that provide all the control and protection functions necessary for implementing a synchronous rectifier operation in a flyback converter. With the use of the NCP4302, the space conscious flyback applications such as Adaptors, chargers, set top boxes can achieve significant efficiency improvements at minimal extra cost. In addition to the synchronous rectifier control, the IC incorporates an accurate TL431 type shunt regulator, current monitoring circuit and optocoupler driver to provide a single IC secondary solution. The NCP4302 works with any type of flyback topology (continuous mode, Quasi−resonant mode or discontinuous mode) – providing a high level of versatility. Features Self−contained Control of Synchronous Rectifier in CCM, DCM, and QR Flyback Applications Interface to External Signal for CCM Mode True Secondary Zero Current Detection High Gate Drive Currents (2.5 A Source/Sink) High Voltage Operation Current Sense Flexibility (MOSFET RDS(on) OR CS Resistor) Accurate Low Voltage Reference − NCP4302A 2.55 V, 1% − NCP4302B 1.275 V, 1% Programmable Independent Secondary Side ton and toff Delays Maximum Frequency of Operation up to 250 kHz These are Pb−Free Devices Typical Applications Notebook Adapters LCD TV Adapters Consumer Appliances such as DVD, VCR Power Over Ethernet Applications (IP phones, Wireless Access Points) Battery Cha...