UCC28050 Datasheet | Texas Instruments

Features - 1 Transition Mode PFC Controller for Low Implementation Cost - Industry Pin patibility With Improved Feature Set - Improved Transient Response With Slew-Rate parator - 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-m A 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 pliance with IEC 1000-3-2 harmonic reduction standard. The controllers are designed for a boost preregulator 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 mand proportional to the input voltage, a current-sense (PWM) parator, 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 the turnoff being governed by the current-sense parator. Additionally, the controller provides features such as peak current limit, default timer, overvoltage protection (OVP) and enable. 2 Applications - Single-Stage PFC Flyback Converters for Lighting and Motor Drives - Switch-Mode Power Supplies for Desktops, Monitors, TVs, and Set Top Boxes (STBs) - AC Adapter Front-End Power Supplies - Electronic Ballasts Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) UCC28050, UCC28051, UCC38050, UCC38051 SOIC (8) PDIP (8) 3.91 mm × 4.90 mm 6.35 mm × 9.81 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. Simplified Application Diagram UCC38050 1 VO_SNS VCC 8 2 P DRV 7 3 MULTIN GND 6 4 CS ZCD 5 UDG-...