Product Overview NCP1562: PWM Controller, High Performance, Active Clamp / Reset For complete documentation, see the data sheet Product Description The NCP1562x is a family of voltage mode controllers designed for dc-dc converters requiring high efficiency and low parts count. These controllers incorporate two in phase outputs with an overlap delay to prevent simultaneous conduction and facilitates soft switching. The main output is designed for driving a forward converter primary MOSFET. The secondary output is designed for driving an active clamp circuit MOSFET, a synchronous rectifier on the secondary side, or an asymmetric half bridge circuit. The NCP1562 family reduces component count and system size by incorporating high accuracy on critical specifications such as maximum duty cycle limit, undervoltage detector and overcurrent threshold. Two distinctive features of the NCP1562 are soft-stop and a cycle skip current limit with a time threshold. Softstop circuitry powers down the converter in a controlled manner if a severe fault is detected. The cycle skip detector enables a softstop sequence if a continuous overcurrent condition is present. Additional features found in the NCP1562 include line feedforward, frequency synchronization up to 1.0 MHz, cycle by cycle current limit with leading edge blanking (LEB), independent under and overvoltage detectors, adjustable output overlap delay, programmable maximum duty cycle, internal startup circuit and soft-start. Features Benefits • Soft-Stop Powers Down Converter in a Controlled Manner • • • • • • • • Independent Line Undervoltage and Overvoltage Detectors Programmable Maximum Volt-Second Product Programmable Soft-Start Internal 100 V Startup Circuit Dual Outputs with Adjustable Overlap Delay >2 A Output Drive Capability Cycle-by-Cycle Current Limit Cycle Skip Initiated if Continuous Current Limit Condition Exists • Voltage Mode Operation with Input Voltage Feedforward For more features, see the data sheet Applications • Eliminates Resonance Between Active Clamp Capacitor and Primary Inductance • Reduces External components • Prevents Transformer Saturation • Reduces Stress During Power Up • Eliminates the Need for External Components End Products • High power isolated DC/DC converters • Power supplies • Desktop / Server PSU • Telecom base station PSU • Flat TV PSU 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 NCP1562ADBR2G Pb-free Active Flyback Voltage Mode Up to 500 No Yes Yes Yes Yes 20 2500 / 2500 TSSOP16 Active Flyback Voltage Mode Up to 500 No Yes Yes Yes Yes 20 2500 / 2500 SOIC16 Active Flyback Voltage Mode Up to 500 No Yes Yes Yes Yes 20 2500 / 2500 TSSOP16 Active Flyback Voltage Mode Up to 500 No Yes Yes Yes Yes 20 2500 / 2500 SOIC16 Halide free NCP1562ADR2G Pb-free Halide free NCP1562BDBR2G Pb-free Halide free NCP1562BDR2G Pb-free Halide free Application Diagram For more information please contact your local sales support at www.onsemi.com Created on: 6/30/2016