PFC controllers minimise system impact

ON Semiconductor has introduced two PFC controllers that operate in fixedfrequency, continuous-conduction mode to minimise interference, with extra features to reduce footprint and power consumption.

The NCP1653 and NCP1654 are designed for use with boost converters. Fixed-frequency operation eases compliance with EMC standards, while continuous-conduction mode also reduces interference by ensuring low dI/dt.

All the features required to build a compact and rugged PFC stage are provided, including internal soft-start, over-voltage protection, coil-current limitation, thermal shutdown, brown-out detection, and a ±1.5A gate driver for efficient switching of TO-220 or TO-247 power MOSFETs.

Both devices are optimised for minimum power consumption in all operating modes, including reduced power at start-up and shutdown to meet stringent specifications for equipment stand-by power.

Compact DIP-8 or SO-8 packages, minimum external components, and integrated protection features enable a space-efficient solution.

The NCP1653 is also able to operate in followerboost mode, allowing a smaller external inductor and power switch. Other on-chip safety features, including input-power-runaway clamping, inrush current detection and true over-power protection, enable additional savings in cost and footprint.

 

FEATURES Duty cycle modulation Internally-trimmed voltage reference Under-Voltage Lockout (UVLO) with hysteresis Soft-start capability Integrated oscillator: 65kHz (NCP1654) 67kHz or 100kHz (NCP1653 variants)

APPLICATIONS AC-mains adapters White goods General-purpose off-line power supplies

 

 

 

Development board NCP1653EVB is available to members of the Future Board Club. To apply for the development board, and membership of the Board Club, go to www.my-boardclub.com/manf-offers.htm This offer is free and subject to qualification.

 

www.onsemi.com/PowerSolutions/product.do?id=NCP1653