Product Overview NCP1252: PWM Controller, Current Mode, for Forward and Flyback Applications For complete documentation, see the data sheet Product Description The NCP1252 controller offers everything needed to build cost effective and reliable ac-dc switching supplies dedicated to ATX power supplies or any forward application. Thanks to the use of an internally fixed timer, NCP1252 detects an output overload without relying on the auxiliary Vcc. A Brown-Out input offers protection against low input voltages and improves the converter safety. Finally, the SOIC-8 package saves PCB space and represents a solution of choice in cost sensitive project. Features Benefits • • • • • Peak current mode control Adjustable switching frequency Latched primary overcurrent protection with 10 ms fixed delay Adjustable soft start timer Auto recovery brown out detection • • • • • • • • • • Internal 160 ns leading edge blanking Frequency jittering Adjustable internal ramp compensation +500 mA / -800 mA Source/Sink current driver capability Skip cycle operation in light/no load operation For more features, see the data sheet • • • • • Applications • • • • Power supplies for PC silver boxes Ac-dc adapter converter Game Adapter Flyback and Forward Application Help to build rugged power supplies High flexibility on the switching frequency Allow temporary over load/current and latch permanent fault Flexibility on the soft start duration Resume the power supply operation after a brown out detection Noise immunity improved Improve the EMI signature by spreading the noise Save external components No need of external power MOSFET driver Save dummy load End Products • Desktops Part Electrical Specifications Product Compliance Status Topolog y Control Mode fsw Typ (kHz) StandUVLO by Mode (V) Short Circuit Protecti on Latch Soft Start VCC Max Drive (V) Cap. (mA) Packag e Type NCP1252ADR2G Pb-free Active Flybac k Current Mode Up to 500 Yes 9 to 10 Yes Yes Yes 28 500 / 800 SOIC-8 Current Mode Up to 500 Yes 9 to 10 Yes Yes Yes 28 500 / 800 PDIP-8 Current Mode Up to 500 Yes 9 to 10 Yes Yes Yes 28 500 / 800 SOIC-8 Current Mode Up to 500 Yes 9 to 10 Yes Yes Yes 28 500 / 800 SOIC-8 Current Mode Up to 500 Yes 9 to 10 Yes Yes Yes 28 500 / 800 SOIC-8 Current Mode Up to 500 Yes 9 to 10 Yes Yes Yes 28 500 / 800 SOIC-8 Halide free Forwar d NCP1252APG Pb-free Active Halide free Flybac k Forwar d NCP1252BDR2G Pb-free Active Halide free Flybac k Forwar d NCP1252CDR2G Pb-free Active Halide free Forwar d Flybac k NCP1252DDR2G Pb-free Active Halide free Forwar d Flybac k NCP1252EDR2G Pb-free Halide free NEW Flybac k Forwar d Application Diagram For more information please contact your local sales support at www.onsemi.com Created on: 6/30/2016