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 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 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) PDF | HTML 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

For additional terms or required resources, click any title below to view the detail page where available.

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 (...)
User guide: PDF
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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.
Reference designs

PMP30446 — Peak efficiency at 99%, 585-W high-voltage buck reference design with standard Si-MOSFETs

This reference design converts a DC-input source in the range of 450 V to 780 V into non-isolated 390 V at 1.5 A. This is an alternative solution to SiC-FET and SiC-Diode buck converter, since the actual power stage uses only standard silicon components. In order to employ 600 V rated devices, the (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP9531 — 350W PSU with Universal AC Input and 28V Output - Reference Design

High efficiency, high power factor and reliable power supply are the main focus of the PMP9531 design for motor driver applications.  Transition mode (TM) power factor correction (PFC) with UCC28051 and LLC series resonant converter (SRC) with UCC25600 are applied in PMP9531.  In (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP20694 — High Efficiency 180W AC/DC Power Supply Reference Design

PMP20694 is high-efficiency AC/DC power supply reference design with 85VAC-300VAC input and 36V/5A output. Transition mode PFC is applied with UCC28051 to prove high power factor and boost input voltage to 450VDC.  LLC resonant converter with UCC25600 is applied to step down the 450V to 36V (...)
Test report: PDF
Schematic: PDF
Reference designs

TIDA-00701 — 100W, 24V High Efficiency High PF Industrial Power Supply with Precision Current & Power Limit

TIDA-00701 is a 100W, 24V, Industrial AC-DC power supply designed for use in Industrial & Instrumentation systems such as process controls, factory automation and machinery control. This reference design has front end Power Factor Correction (PFC) circuit designed using UCC28051 PFC controller, (...)
Design guide: PDF
Schematic: PDF
Reference designs

PMP8920 — High-Eff 2Stage Univ Input Pwr Supply Using Trans Mode PFC/LLC Resonant Conv Reference Design

Low EMI, high efficiency, high power factor and reliable power supply are main focus of the PMP8920 design for telecom applications. Transient mode (TM) power factor correction (PFC) with UCC28051 and LLC series resonant converter (SRC) with UCC25600 are applied in PMP8911. In addition, (...)
Test report: PDF
Reference designs

PMP9730 — Universal AC Input, 12V/3A Single stage PFC-Flyback Reference Design with Synchronous Rectification

The PMP9730 reference design employs the UCC28051 power factor correction controller to implement a single stage PFC-Flyback AC/DC converter that generates an isolated 12V output at 3A from a universal AC input. The design features UCC28910 primary side regulation Flyback switcher for (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP9640 — 310W PSU Using Transition Mode Bridgeless PFC and LLC-SRC - Reference Design

High efficiency, high power factor and reliable power supply are the main focus of the PMP9640 design for motor driver applications.  Low cost analog transition mode (TM) PFC controller UCC28051 has been used for bridgeless PFC as the first conversion stage of the PMP9640.  LLC series (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP8911 — High Eff 2Stage Univ Input Power Supply-Transition Mode PFC LLC Resonant Conv Reference Design

Low EMI, high efficiency, high power factor and reliable power supply are main focus of the PMP8911 design for telecom applications. Transient mode (TM) power factor correction (PFC) with UCC28051 and LLC series resonant converter (SRC) with UCC25600 are applied in PMP8911. Low EMI is expected (...)
Test report: PDF
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