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AC/DC & isolated DC/DC switching regulators
Power factor correction (PFC) controllers

UCC28056

ACTIVE

6-pin high performance CRM/DCM PFC controller

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Data sheet

UCC28056

ACTIVE
Data sheet Order now

Product details

Topology Boost Control mode TM Switching frequency (max) (kHz) 600 UVLO thresholds on/off (V) 10.65/8.85 Vin (max) (V) 34 Features < 150W Applications, Audible Noise Minimization, Low Power, OVP, Peak current mode, Soft Start, Transition Control Mode Rating Catalog Operating temperature range (°C) -40 to 125 Duty cycle (max) (%) 1
Topology Boost Control mode TM Switching frequency (max) (kHz) 600 UVLO thresholds on/off (V) 10.65/8.85 Vin (max) (V) 34 Features < 150W Applications, Audible Noise Minimization, Low Power, OVP, Peak current mode, Soft Start, Transition Control Mode Rating Catalog Operating temperature range (°C) -40 to 125 Duty cycle (max) (%) 1
SOT-23 (DBV) 6 8.12 mm² 2.9 x 2.8
  • Ultra-low no-load input power enables < 80-mW standby power at 230 VAC in PFC+LLC system
  • Excellent light load efficiency and high efficiency over wide range of load due to multi-mode TM and DCM control
  • Enables low system cost through FET drain valley synchronized turn-on which eliminates need for second winding on the boost inductor
  • Enables compliance to green power standards without disabling PFC
    • EuP Lot 6 Tier 2, CoC Ver. 5 Tier 2, Energy Star Ver. 6.1, DoE Level VI
  • Burst mode with soft-entry and soft-exit periods enables ultra-low audible noise output
  • Enhanced error amplifier, responds rapidly to load steps without degrading input current distortion
  • User adjustable valley delay ensures valley switching
  • Low start-up current consumption (<46 µA)
  • Wide VCC range 8.5 V to 34 V
  • Cycle-by-cycle current limit
  • Second independent output over-voltage protection
  • Integrated over-temperature protection
  • Create a custom design using the UCC28056 device with the WEBENCH® Power Designer
  • Ultra-low no-load input power enables < 80-mW standby power at 230 VAC in PFC+LLC system
  • Excellent light load efficiency and high efficiency over wide range of load due to multi-mode TM and DCM control
  • Enables low system cost through FET drain valley synchronized turn-on which eliminates need for second winding on the boost inductor
  • Enables compliance to green power standards without disabling PFC
    • EuP Lot 6 Tier 2, CoC Ver. 5 Tier 2, Energy Star Ver. 6.1, DoE Level VI
  • Burst mode with soft-entry and soft-exit periods enables ultra-low audible noise output
  • Enhanced error amplifier, responds rapidly to load steps without degrading input current distortion
  • User adjustable valley delay ensures valley switching
  • Low start-up current consumption (<46 µA)
  • Wide VCC range 8.5 V to 34 V
  • Cycle-by-cycle current limit
  • Second independent output over-voltage protection
  • Integrated over-temperature protection
  • Create a custom design using the UCC28056 device with the WEBENCH® Power Designer

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. When used with the LLC controller UCC256403/4, and dual synchronous rectifier controller UCC24624 less than 80 mW system standby power can be achieved, enabling PFC always on architecture and eliminating the need for an auxiliary converter. This with FET Drain valley turn-on with simple boost inductor allows fewest component count and reduced system cost.

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. When used with the LLC controller UCC256403/4, and dual synchronous rectifier controller UCC24624 less than 80 mW system standby power can be achieved, enabling PFC always on architecture and eliminating the need for an auxiliary converter. This with FET Drain valley turn-on with simple boost inductor allows fewest component count and reduced system cost.
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Technical documentation

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Type Title Date
* Data sheet UCC28056 6-Pin Single-Phase Transition-Mode PFC Controller datasheet (Rev. E) PDF | HTML 28 Aug 2019
More literature PFC Controller Step-by-Step Selection Guide PDF | HTML 28 Feb 2023
Application note UCC28056 System Bring Up Guidelines and Application Debug FAQ PDF | HTML 08 Oct 2021
Technical article How to reduce audible noise and power consumption at standby in your AC/DC design 22 Apr 2020
EVM User's guide UCC28056EVM-296 Evaluation Module User Guide (Rev. C) 31 Oct 2019
Application note Optimizing Efficiency and Standby Power With the UCC28056 in Offline Application (Rev. B) 13 Aug 2019
Application note Exceeding Modern Energy Standards with 'Always On' PFC and LLC Controllers​ (Rev. B) 01 Aug 2019
Application note UCC28056,Using Auxiliary winding voltage for driving ZCD/CS Pin (Rev. B) 01 Aug 2019
EVM User's guide PFCLLCSREVM-034 User Guide 26 Jul 2019
Application note UCC28056 Selection Guide 24 Jun 2019
Technical article Three considerations for achieving high efficiency and reliability in industrial AC/DC power supplies 04 Apr 2019
Technical article Gain ultra-high power density for 100-W USB Power Delivery adapters 05 Mar 2019
Technical article Crank up your power supply with LLC controllers 23 Oct 2017

Design & development

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

Evaluation board

PFCLLCSREVM034 — AC to isolated DC EVM with UCC28056B, UCC256404 and UCC24624

PFCLLCSREVM034 is a 168-W AC/DC supply with a transition-mode power-factor-correction front end and isolated half-bridge LLC resonant converter with synchronous rectification. This EVM accepts AC input from 90 Vrms to 264 Vrms and outputs 12-V DC with 168-W full-load output power.

User guide: PDF
Not available on TI.com
Evaluation board

UCC28056EVM-296 — UCC28056 PFC evaluation board

The UCC28056EVM is an EVM of PFC converter with UCC28056, a CrM/DCM Mixed Mode PFC Controller. The EVM accepts an input of 85Vac to 265Vac and provides an output of 390Vdc with full load output power of 165W.

User guide: PDF
Not available on TI.com
Simulation model

UCC28056 SIMPLIS Transient Model

SLUM620.ZIP (157 KB) - SIMPLIS Model
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Simulation model

UCC28056A SIMPLIS MODEL (Rev. A)

SLUM688A.ZIP (241 KB) - SIMPLIS Model
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Simulation model

UCC28056B SIMPLIS MODEL (Rev. A)

SLUM689A.ZIP (241 KB) - SIMPLIS Model
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Simulation model

UCC28056C SIMPLIS MODEL (Rev. A)

SLUM690A.ZIP (231 KB) - SIMPLIS Model
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Calculation tool

UCC28056x Design Calculator (Rev. B)

SLUC641B.ZIP (321 KB)
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Reference designs

PMP40580 — 180-W universal input PFC + LLC TV power supply reference design

This AC to DC power supply design for TV application provides 12-V, 5-A and 150-V, 0.8-A output from universal AC voltage (90 Vac to 264 Vac). The design uses CRM/DCM PFC controller UCC28056, and LLC controller UCC256404 with enhanced burst mode which enabled for low standby power and smaller (...)
Test report: PDF
Schematic: PDF
Reference designs

TIDA-010047 — 22-W/in3, 93.1% peak efficiency, 100-W USB-PD 3.0 AC/DC adapter reference design with Si MOSFET

This fully-tested reference design is a high-efficiency, high-power-density, AC/DC adapter solution with a wide input voltage range (100- to 240-V AC) for laptop adapters and smartphone charger applications. This design consists of a front-end transition-mode (TM) power factor correction (PFC) (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-010038 — 94% Peak efficiency, 150W norm, 240W peak industrial AC/DC power supply with CC/CV reference design

This compact, high efficiency, 24V DC, 150W nominal, 240W peak output at 230VAC reference design is targeted for industrial AC/DC power supplies. The circuit consists of a frontend transition mode (TrM) power factor correction(PFC) circuit based on the UCC28056, followed by a robust LLC stage for (...)
Design guide: PDF
Schematic: PDF
Reference designs

PMP22087 — 336-W Auxless AC/DC power supply reference design with 80 PLUS platinum compatible performance

This reference design is an AC/DC power supply design with critical conduction mode (CRM) PFC and half-bridge LLC series resonant converter that provides 24 V, 240-W continuous, 336-W peak output from a universal input AC voltage (90 VAC to 264 VAC). This design uses UCC28056 CRM/DCM PFC (...)
Test report: PDF
Schematic: PDF
Reference designs

TIDA-01623 — 30-W/in3, 93.4% efficiency, 100-W AC/DC adapter reference design

This fully-tested reference design is a high-efficiency, high-power-density, AC/DC adapter solution with a wide input voltage range (100- to 240-V AC) for laptop adapters and smartphone charger applications. This design consists of a front-end transition-mode (TM) power factor correction (PFC) (...)
Design guide: PDF
Schematic: PDF
Reference designs

PMP21160 — 336-W auxless AC/DC power supply reference design with 80 PLUS platinum compatible performance

This reference design uses UCC28056 CRM/DCM PFC controller and UCC256304 enhanced LLC controller with integrated driver to provide 24-V/10-A output (continuous, 14-A peak) from universal AC input. This design achieves 92.8% peak efficiency at 115-Vac input and 94.9% peak efficiency at 230-Vac (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP21251 — Less than 90mW Ultra-low Standby Power Auxless AC-DC Power Supply Reference Design

The PMP21251 reference design uses UCC28056 CRM/DCM PFC controller and UCC256304 enhanced LLC controller with integrated driver to provide 12V/10.8A output (continuous, 14.4A peak) from universal AC input. This design achieves 92.4% peak efficiency at 115VAC input and 94.0% peak efficiency at (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP21098 — 170W Auxless AC/DC Power Supply Reference Design with 80 PLUS Gold Compatible Performance

The PMP21098 reference design uses UCC28056 transition mode PFC controller and UCC25630 enhanced LLC controller with integrated driver to provide 12V/10.8A output (continuous, 14.2A peak) from universal AC input. This design achieves 91.8% peak efficiency at 115VAC input and 93.4% peak efficiency (...)
Test report: PDF
Schematic: PDF
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SOT-23 (DBV) 6 View options

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