NCP4331

NCP4331 Synchronous Buck Controller for High Efficiency Post Regulation The NCP4331 houses a dual MOSFET driver intended to be used as a companion chip in ac-dc or dc-dc multi-output post regulated power supplies. Directly fed by the secondary ac signal, the device keeps power dissipation to the lowest while reducing external component count. Further, the implementation of N-channel MOSFETs gives NCP4331-based applications a significant advantage in terms of efficiency. Features ăHigh Gate Drive Capability ăBootstrap for N-MOSFET High-Side Drive ăTwo Embedded Error Amplifiers Allowing Constant Current Constant Voltage (CCCV) Operation ă±1.5% Regulation Voltage Reference Over 0°C to 85°C Temperature Range ăProgrammable Soft-Start ăThermal Shutdown for Overtemperature Protection ăPWM Operation Synchronized to the Converter Frequency ăOver-Lap Management for Soft Switching ăInternal Regulator to Ease the Circuit Feeding ăUndervoltage Detection ăThese are Pb-Free Devices Typical Applications ăOff-line Switch Mode Power Supplies ăPower Dc-dc Converters ăEfficient Alternative to Mag-Amp Post-Regulators http://onsemi.com MARKING DIAGRAMS 16 1 SO-16 D SUFFIX CASE 751B 16 NCP4331G ALYYWW 1 16 16 NCP 1 TSSOP-16 DB SUFFIX CASE 948F 4331 ALYWG G 1 A = Assembly Location L = Wafer Lot YY = Year WW = Work Week G or G = Pb-Free Package (Note: Microdot may be in either location) PIN CONNECTIONS CSout 1 CSin- 2 CSin+ 3 UVP/STDWN 4 COMP 5 FB 6 SS/Dmax 7 Cramp 8 16...