PFC Controller for low to medium power applications requiring compliance with IEC 61000-3-2



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.


  • 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

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Parametrics Compare all products in Power Factor Correction

Device Type
Control Method
UVLO Thresholds On/Off (V)
Operating Supply (Max) (V)
Operating Supply Current (mA)
Operating Temperature Range (C)
UCC28051 UCC28050 UCC28056 UCC38050 UCC38051
Single-phase PFC    Single-phase PFC    Single Phase PFC    Single-phase PFC    Single-phase PFC   
TM    TM    TM/DCM    TM    TM   
12.5/9.7    15.8/9.7    10.65/8.85    15.8/9.7    12.5/9.7   
18    18    34    18    18   
4    4    2.2    4    4   
6SOT-23    8PDIP
-40 to 105    -40 to 85    -40 to 125    0 to 70    0 to 70   
Catalog    Catalog    Catalog    Catalog    Catalog   
Transition Mode Control   
Transition Mode Control   
< 150W Applications
Audible noise minimization circuitry
Low Power
Soft Start
Transition Mode Control   
Transition Mode Control   
Transition Mode Control   

WEBENCH® Designer UCC28051

AC Frequency  60 Hz  50 Hz
  Min   Max Range
VinRMS  V 70.0 to 300.0V
Vout  V 110 to 450V
Iout  A ≤ 1A
Ambient Temp  °C -40 to 105°C