UCC28056 6-Pin High Performance CRM/DCM PFC Controller | TI.com


6-Pin High Performance CRM/DCM PFC Controller



The UCC28056 device drives PFC boost stages based on an innovative mixed mode method that operates in Transition mode (TM ) at full load and transitions seamlessly into Discontinuous Conduction mode (DCM) at reduced load, automatically reducing switching frequency. This device incorporates burst mode operation to further improve light load performance, enabling systems to meet challenging energy standards while eliminating the need to switch off the PFC. UCC28056 can drive a PFC power stage up to 300 W, ensuring sinusoidal line input current with low distortion, close to unity power factor while keeping the PFC ‘always on’. When used with the LLC controller UCC256301, this 6-pin device eliminates the need for an auxiliary fly back converter, (typically needed in systems for good standby performance) while achieving less than 80 mW at 230 Vac. The device also enables instant turn on while reducing external component count to a minimum.


  • Low Input Current Distortion and Near Unity Power Factor Down to 10% Load
    • Enables Compliance to IEC1000-3-2
  • Ultra-low No-load Input Power (25 mW at 115 Vac, 40 mW at 230 Vac)
  • Excellent Efficiency Over Range Of Load
  • Enables <60mW Standby Power at 115Vac and <80mW Standby Power at 230 Vac in PFC+LLC System
  • Enables Compliance To Green Power Standards Without Disabling PFC
    • EuP Lot 6 Tier 2, CoC Ver. 5 Tier 2, Energy Star for computers Ver. 6.1, DOE Level VI
  • Ultra-low Audible Noise Output
  • Burst Mode With Soft-entry and Soft-exit Periods
  • Enhanced EA, Responds Rapidly to Load Steps Without Degrading Input Current Distortion
  • Valley Synchronized Turn-on Requires No Second Winding On The Boost Inductor
  • User Adjustable Valley Delay
  • Low Start-up Current Consumption (<46 µA)
  • Wide VCC Range 8.5 V to 34 V
  • Cycle-by-cycle Current Limit
  • Second Independent Output Voltage Protection
  • Integrated Over-temperature Protection
  • Create a Custom Design Using the UCC28056 Device With the WEBENCH® Power Designer

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Parametrics Compare all products in Power factor correction (PFC) controllers

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

Design tool

WEBENCH® Designer UCC28056

AC Frequency  60 Hz  50 Hz
  Min   Max Range
VinRMS  V 70.0 to 270.0V
Vout  V 110 to 450V
Iout  A ≤ 1A
Ambient Temp  °C -40 to 125°C