Power factor correction controller improves energy efficiency

December 06, 2013 // By Graham Prophet
TI's 8-pin, continuous conduction mode PFC controller reduces power dissipation in shunt resistor by 50% while delivering power factor greater than 0.95

Texas Instruments' latest power factor correction (PFC) controller claims the widest-available programmable frequency range operating in continuous conduction mode. The UCC28180 8-pin PFC controller cuts power consumption in half and delivers power factor correction greater than 0.95. Its adjustable switching frequency helps you optimise designs for size, cost and efficiency. The controller also achieves AC-input current total harmonic distortion (THD) as low as 5% with a 50% smaller shunt resistor, in comparison to previous-generation solutions.

Features of the UCC28180 include:

- Wide-range, programmable frequency range operates from 18 kHz to 250 kHz and allows usage of IGBTs, GaN, SiC or Si MOSFETs.

- Lowest power dissipation: By employing reduced current sense thresholds, the PFC controller uses a smaller shunt resistor, while maintaining low THD.

- Protection functions, such as soft over current, cycle-by-cycle peak current limit, output open-loop, overvoltage and open-pin detection, guard the power supply system components.

- Audible noise minimisation: UCC28180 allows faster loop response when output voltage exceeds regulation level, thus minimising audible noise in magnetic components caused by abrupt PWM output shut-off during overvoltage protection.

The UCC28180 operates seamlessly with any TI DC/DC controller, such as the UCC28950, UCC28250 or UCC25600, as well as motor control and lighting solutions. It is available in an 8-pin SOIC package at $0.85 (1,000). The UCC28180EVM-573 360-W PFC evaluation module is priced at $99.

Texas Instruments; www.ti.com/ucc28180-pr