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UCC28050

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Transition mode PFC controller with 15.6V/9.7V UVLO and IEC61000-3-2 compliance, -40°C to 105°C

Product details

Topology Boost Control mode TM Switching frequency (max) (kHz) 200 UVLO thresholds on/off (V) 15.8/9.7 Vin (max) (V) 18 Features Enable, Overvoltage protection, Peak current mode, Supports Flyback, Transition Control Mode Rating Catalog Operating temperature range (°C) -40 to 105 Duty cycle (max) (%) 99
Topology Boost Control mode TM Switching frequency (max) (kHz) 200 UVLO thresholds on/off (V) 15.8/9.7 Vin (max) (V) 18 Features Enable, Overvoltage protection, Peak current mode, Supports Flyback, Transition Control Mode Rating Catalog Operating temperature range (°C) -40 to 105 Duty cycle (max) (%) 99
PDIP (P) 8 92.5083 mm² 9.81 x 9.43 SOIC (D) 8 29.4 mm² 4.9 x 6
  • 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
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

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
Not available on TI.com
Calculation tool

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

MathCAD application design tool for use with the UCC38050.
Reference designs

PMP11155 — Universal AC Input, 24V/1A PFC-Flyback Reference Design

This UCC28050-based reference design provides both isolation and power factor correction in a single stage.  The circuit is built on a 76mm by 50mm, two layer board.  The test report documents performance with regards to efficiency, power factor, thermal, EMI, and more.
Test report: PDF
Schematic: PDF
Package Pins Download
PDIP (P) 8 View options
SOIC (D) 8 View options

Ordering & quality

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