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PFC controller halves power dissipation in shunt resistor

Posted: 05 Dec 2013 ?? ?Print Version ?Bookmark and Share

Keywords:Texas Instruments? shunt resistor? PFC controller? power factor correction?

Texas Instruments Inc. (TI) has rolled out a power factor correction (PFC) controller offering what the company says is industry's widest range programmable frequency operating in continuous conduction mode. The UCC28180 8-pin PFC controller reduces power consumption by 50 percent and delivers power factor correction greater than 0.95, compared to existing solutions to support many universal-input AC/DC applications such as industrial, server power supplies, air-conditioners, lighting, consumer appliances and home office electronics, stated the firm.

The UCC28180's adjustable switching frequency helps the designer optimize their design for size, cost and efficiency. The controller also achieves AC-input current total harmonic distortion (THD) as low as five percent with a 50 percent smaller shunt resistor, in comparison to previous-generation solutions.


The device's wide-range, programmable frequency range operates from 18-250kHz and allows usage of IGBTs, GaN, SiC or Si MOSFETs that minimize component count and improves efficiency. By employing reduced current sense thresholds, the PFC controller uses a smaller shunt resistor, which cuts power dissipation in half compared to previous-generation devices, while maintaining low THD. Rich 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, added TI. Moreover, the UCC28180 allows faster loop response when output voltage exceeds regulation level, thus minimizing incidence of 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, providing reliable, efficient, low-cost power designs.

The UCC28180 PFC controller is available in an 8-pin SOIC package and is priced at $0.85 in quantities of 1,000. The UCC28180EVM-573 360-W PFC evaluation module is priced at $99 and available for ordering through TI's eStore.

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