NCP81178 Datasheet | onsemi

Secondary Synchronous Rectifier Driver for Forward Converters The NCP81178 is a secondary- side synchronous rectifier driver designed for isolated power converters, especially actively clamped forward and fly- back, and asymmetric half- bridge converters. The NCP81178 drives two N- channel MOSFETs on the secondary side in a plementary manner. It accepts a PWM input signal derived from the secondary winding or an auxiliary winding on the main power transformer. It can also take a PWM signal from the primary- side controller through a pulse transformer or other isolators. Features - N- Channel Synchronous Rectifier MOSFET Driver - PWM Input Derived from a Winding on the Main Transformer or Directly from a Pulse Transformer - Internally Generated PWM Threshold Voltage that can be Programmed Externally - Pre- bias Startup Capability - Primary Shutdown Detection - Frequency Detection Window - Wide VIN/VCC Range: 4.5 V to 14 V - 6 V/150 m A LDO for VCC Supply - 4.5 A/3.8 A Sink and 3 A Source Drive Capability - 12 ns PWM Propagation Time - 12 ns Rise Time/10 ns Fall Time at CL = 4700 p F @ VCC = 6 V - VCC under- voltage lockout - Will support converter output voltages as high as 28 V - Pb- Free 10- pin DFN 3 mm x 3 mm Package - This is a Pb- Free Device Typical Applications - High- Efficiency Isolated DC/DC Power Supplies - Server Power, 48 V Tele and Data- Applications .onsemi. DFN10 MN SUFFIX CASE 506AA MARKING DIAGRAM 81178 ALYWG A = Assembly Location L = Wafer Lot Y = Year W = Work Week G = Pb- Free Package (Note: Microdot may be in either location) PIN CONNECTIONS SDDET 1 RRAMP...