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UCC28050, UC...
Product Folder
Sample & Buy
Technical Documents
Tools & Software
Support & Community
Reference Design
UCC28050, UCC28051, UCC38050, UCC38051
SLUS515G – SEPTEMBER 2002 – REVISED DECEMBER 2015
UCC2805x, UCC3805x Transition Mode PFC Controller
1 Features
1 Transition Mode PFC Controller for Low Implementation Cost
Industry Pin Compatibility With Improved Feature Set
Improved Transient Response With Slew-Rate Comparator
Zero Power Detect to Prevent Overvoltage Protection (OVP) During Light Load Conditions
Accurate Internal VREF for Tight Output Regulation
Two UVLO Options OVP, Open-Feedback Protection, and Enable
Circuits ±750-mA Peak Gate Drive Current Low Start-Up and Operating Currents Lead (Pb)-Free Packages
3 Description
The UCC38050 and UCC38051 are PFC controllers for low-to-medium power applications requiring compliance with IEC 1000-3-2 harmonic reduction standard. The controllers are designed for a boost pre
regulator operating in transition mode (also referred to as boundary-conduction mode or critical conduction-mode operation). They feature a transconductance voltage amplifier for feedback error processing, a simple multiplier for generating a current command proportional to the input voltage, a current-sense (PWM) comparator, PWM logic, and a totem-pole driver for driving an external FET.
In the transition mode operation, the PWM circuit is self-oscillating, with the turnon being governed by an inductor zero-current detector (ZCD pin), and ...