Product details


Control method Current Output power 85-265 Vac (Max) (W) 4.5 Output power 175-265 Vac (Max) (W) 6 Vin (Min) (V) 30 Topology Buck Duty cycle (Max) (%) 55 Frequency (Max) (kHz) 62 UVLO thresholds on/off (V) 3.9/3.6 Operating temperature range (C) -40 to 125 open-in-new Find other Offline converters

Package | Pins | Size

SOIC (D) 7 29 mm² 4.9 x 6 open-in-new Find other Offline converters


  • Integrated 14-Ω, 700-V Power MOSFET
  • Integrated High-Voltage Current Source for Internal Device Bias Power
  • Integrated Current Sense
  • Internal Soft Start
  • Self-Biased Switcher (Start Up and Operation Directly from Rectified Mains Voltage)
  • Supports Buck, Buck-Boost and Flyback Topologies
  • <100-μA Device Quiescent Current
  • Robust Current Protection During Load Short Circuit
  • Protection
    • Current Limit
    • Overload and Output Short Circuit
    • Over Temperature
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The UCC28881 integrates the controller and a 14-Ω, 700-V power MOSFET into one monolithic device. The device also integrates a high-voltage current source, enabling start up and operation directly from the rectified mains voltage. UCC28881 is the same family device of UCC28880, with higher current handling capability.

The low quiescent current of the device enables excellent efficiency. With the UCC28881 the most common converter topologies, such as buck, buck-boost and flyback can be built using a minimum number of external components.

The UCC28881 incorporates a soft-start feature for controlled start up of the power stage which minimizes the stress on the power-stage components.

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Technical documentation

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet UCC28881 700-V, 225-mA Low Quiescent Current Off-Line Converter datasheet (Rev. B) Jan. 11, 2016
Application note Operating UCC2888x Offline Buck in Saturation for Cost Reduction Jun. 22, 2018
Technical articles How to build a cost-competitive and robust auxiliary power supply Feb. 01, 2018
Application note UCC2888x Diode Selection When Configured as High Side Buck Nov. 20, 2017
Technical articles Unique techniques to increase controller power Aug. 23, 2017
Application note UCC28880, UCC28881 Audible Noise Reduction Techniques Mar. 23, 2017
Technical articles Powering the IoT Jan. 26, 2017
User guide Using the UCC28881EVM-680 (Rev. A) Dec. 08, 2015
Technical articles Power Tips: Design considerations of high-voltage converters in a cascode MOSFET Nov. 03, 2015

Design & development

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

Hardware development


The UCC28881EVM-680 evaluation module (EVM) is an offline high-voltage buck-type power supply that provides 13 VDC at a maximum output of 225 mA. The input accepts a voltage range of 85 VAC to 265 VAC.

  • Single 13V output
  • No load to 225-mA load range
  • Universal off-line input voltage range
  • Overload and output short-circuit protection
  • Controlled start up and restart after fault protection

Design tools & simulation

SLUM501.ZIP (130 KB) - PSpice Model
SLUC626B.ZIP (174 KB)

Reference designs

Many TI reference designs include the UCC28881 Use our reference design selection tool to review and identify designs that best match your application and parameters.

CAD/CAE symbols

Package Pins Download
SOIC (D) 7 View options

Ordering & quality

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  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Support & training

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