Product details

Topology Boost Control mode TM Practical operating frequency (Max) (MHz) 0.2 UVLO thresholds on/off (V) 12.5/9.7 Device type Controllers Operating supply current (mA) 4 Features OVP, Supports Flyback, Peak Current Mode, Transition Control Mode Rating Catalog Operating temperature range (C) -40 to 105
Topology Boost Control mode TM Practical operating frequency (Max) (MHz) 0.2 UVLO thresholds on/off (V) 12.5/9.7 Device type Controllers Operating supply current (mA) 4 Features OVP, Supports Flyback, Peak Current Mode, Transition Control Mode Rating Catalog Operating temperature range (C) -40 to 105
PDIP (P) 8 93 mm² 9.81 x 9.43 SOIC (D) 8 19 mm² 3.91 x 4.9
  • 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
  • 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

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 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 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 the turnoff being governed by the current-sense comparator. Additionally, the controller provides features such as peak current limit, default timer, overvoltage protection (OVP) and enable.

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 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 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 the turnoff being governed by the current-sense comparator. Additionally, the controller provides features such as peak current limit, default timer, overvoltage protection (OVP) and enable.

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Technical documentation

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Type Title Date
* Data sheet UCC2805x, UCC3805x Transition Mode PFC Controller datasheet (Rev. G) 05 May 2015
Technical article Is PFC possible without input voltage sensing? 14 Sep 2016
Technical article PowerTips: Construct a low cost bridgeless PFC with an analog controller – Part I 20 Nov 2014
Analog design journal Analog Applications Journal 4Q 2014 24 Oct 2014
Analog design journal Design a transition-mode, bridgeless PFC with a standard PFC controller 24 Oct 2014
Application note High-Efficiency AC-DC TV Power Solutions: An Intelligent LED Backlight Scheme 15 Jul 2011
User guide UCC28600 120-W Evaluation Module User's Guide (Rev. A) 19 Oct 2006
User guide PR320 UCC28050 100-W PFC Ballast Pre-Regulator 16 Aug 2004
Application note UCC38050 100W Critical Conduction (PFC) Reference Design (Rev. A) 03 May 2004
User guide 100-W Universal Line Input PFC Boost Converter (Rev. A) 03 Feb 2004

Design & development

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Evaluation board

UCC28051EVM — UCC28051 Evaluation Module

UCC28051 Evaluation Module is a 100-W offline AC-DC voltage converter with power factor correction (PFC). The power module was designed to show how the UCC28051 could be configured in an off-line power factor corrected preregulator. The module was designed to operate over a universal input range (...)
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Calculation tool

UCC38050-CALC — MathCAD Calculation Tool for UCC38050 Transition Mode PFC Controller

MathCAD application design tool for use with the UCC38050.
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PDIP (P) 8 View options
SOIC (D) 8 View options

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