UCC28051 is a PFC Controller for Low- to Medium-Power Applications that Require IEC 1000-3-2 Compliance

This post sponsored by Texas Instruments.

The UCC28051 is a PFC controller for low- to medium-power applications that need compliance with IEC 1000-3-2 harmonic reduction standard; specifically, it is designed for controlling a boost preregulator operating in transition mode. 

The product features a simple multiplier for generating a current command proportional to the input voltage, a transconductance voltage amplifier for feedback error processing, PWM logic, a current-sense (PWM) comparator, and a totem-pole driver for driving an external FET.

In transition mode operation, the PWM circuit is self-oscillating with the turn-on being governed by an inductor zero-current detector (ZCD pin). The turn-off is governed by the current-sense comparator. Additionally, the controller provides features such as enable, peak current limit, overvoltage protection, and default timer.

The UCC38051, while being pin compatible with other industry controllers providing similar functionality, offers many feature enhancements and tighter specifications, leading to an overall reduction in system implementation cost. The system performance is enhanced by incorporation of zero power detect function. It also features innovative slew rate enhancement circuits which improve the large signal transient performance of the voltage error amplifier. The UVLO turn-on threshold for UCC38051 it is 12.5 V.

By: Rachel Kalina

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