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UCC38050DG4 Datasheet(PDF) 1 Page - Texas Instruments |
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UCC38050DG4 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 30 page UCC28050, UCC28051 UCC38050, UCC38051 SLUS515F−SEPTEMBER 2002 − REVISED MARCH 2009 TRANSITION MODE PFC CONTROLLER 1 www.ti.com FEATURES D Transition Mode PFC Controller for Low Implementation Cost D Industry Pin Compatibility With Improved Feature Set D Improved Transient Response With Slew-Rate Comparator D Zero Power Detect to Prevent OVP During Light Load Conditions D Accurate Internal VREF for Tight Output Regulation D Two UVLO Options D Overvoltage Protection (OVP), Open-Feedback Protection and Enable Circuits D ± 750-mA Peak Gate Drive Current D Low Start-Up and Operating Currents D Lead (Pb)-Free Packages APPLICATIONS D Switch-Mode Power Supplies for Desktops, Monitors, TVs and Set Top Boxes (STBs) D AC Adapter Front-End Power Supplies D Electronic Ballasts DESCRIPTION The UCC38050 and UCC38051 are PFC controllers for low-to-medium power applications requiring compliance with IEC 1000-3-2 harmonic reduction standard. It is designed for controlling a boost preregulator operating in transition mode (also referred to as boundary conduction mode or critical conduction mode operation). It features 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. SIMPLIFIED APPLICATION DIAGRAM UDG−02125 1 2 3 4 8 7 6 5 VCC DRV GND ZCD VO_SNS COMP MULTIN CS UCC38050 PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright 2009, Texas Instruments Incorporated Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. |
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