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6-Pin High Performance CRM/DCM PFC Controller


Package | PIN: SOT-23 (DBV) | 6
Temp: Q (-40 to 125)
Carrier: Cut Tape
Qty Price
1-9 $1.18
10-24 $1.06
25-99 $0.98
100-249 $0.83
250-499 $0.77
500-749 $0.63
750-999 $0.50
1000+ $0.45


  • 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 forcomputers 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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Texas Instruments  UCC28056DBVT

The UCC28056 device drives PFC boost stages based on an innovative mixed mode method thatoperates in Transition mode (TM ) at full load and transitions seamlessly into DiscontinuousConduction mode (DCM) at reduced load, automatically reducing switching frequency. This deviceincorporates burst mode operation to further improve light load performance, enabling systems tomeet challenging energy standards while eliminating the need to switch off the PFC. UCC28056 candrive 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 controllerUCC256301, this 6-pin device eliminates the need for an auxiliary fly back converter, (typicallyneeded in systems for good standby performance) while achieving less than 80 mW at 230 Vac. Thedevice also enables instant turn on while reducing external component count to a minimum.