Product details

Control mode Constant Current, Constant Voltage, Primary-side regulation Frequency (Max) (kHz) 115 UVLO thresholds on/off (V) 9.5/6.5 Duty cycle (Max) (%) 99 Features Light Load Efficiency, Current Limiting, Integrated Switch, Adjustable Switching Frequency, HV Start-up, Thermal Shutdown, Green Mode, Input Line Monitor, Leading Edge Blanking, Soft Start, IoT Compatible Operating temperature range (C) -40 to 125 Rating Catalog Device type Controllers Topology Buck, Flyback
Control mode Constant Current, Constant Voltage, Primary-side regulation Frequency (Max) (kHz) 115 UVLO thresholds on/off (V) 9.5/6.5 Duty cycle (Max) (%) 99 Features Light Load Efficiency, Current Limiting, Integrated Switch, Adjustable Switching Frequency, HV Start-up, Thermal Shutdown, Green Mode, Input Line Monitor, Leading Edge Blanking, Soft Start, IoT Compatible Operating temperature range (C) -40 to 125 Rating Catalog Device type Controllers Topology Buck, Flyback
SOIC (D) 7 29 mm² 4.9 x 6
  • Constant-Voltage (CV) and Constant-Current (CC) Output Regulation Without Optical-Coupler
  • ±5% Output Voltage Regulation Accuracy
  • ±5% Output Current Regulation With AC Line and Primary Inductance Tolerance Compensation
  • 700-V Start-Up and Smart Power Management Enables <30-mW Standby Power
  • 115-kHz Maximum Switching Frequency Design for High-Power Density
  • Valley Switching and Frequency Dithering to Ease EMI Compliance
  • Thermal Shut Down
  • Low Line and Output Over-Voltage Protection
  • Constant-Voltage (CV) and Constant-Current (CC) Output Regulation Without Optical-Coupler
  • ±5% Output Voltage Regulation Accuracy
  • ±5% Output Current Regulation With AC Line and Primary Inductance Tolerance Compensation
  • 700-V Start-Up and Smart Power Management Enables <30-mW Standby Power
  • 115-kHz Maximum Switching Frequency Design for High-Power Density
  • Valley Switching and Frequency Dithering to Ease EMI Compliance
  • Thermal Shut Down
  • Low Line and Output Over-Voltage Protection

The UCC28910 and UCC28911 are high-voltage flyback switchers that provide output voltageand current regulation without the use of an optical coupler. Both devices incorporate a 700-Vpower FET and a controller that process operating information from the flyback auxiliary windingand power FET to provide a precise output voltage and current control. The integrated high-voltage current source for startup that is switched off during device operation, and the controller current consumption is dynamically adjusted with load. Both enablethe very low stand-by power consumption.

Control algorithms in the UCC28910 and UCC28911, combining switching frequency and peakprimary current modulation, allow operating efficiencies to meet or exceed applicable standards.Discontinuous conduction mode (DCM) with valley switching is used to reduce switching losses.Built-in protection features help to keep secondary and primary component stress levels in check across the operating range. The frequency jitter helps to reduce EMI filter

The UCC28910 and UCC28911 are high-voltage flyback switchers that provide output voltageand current regulation without the use of an optical coupler. Both devices incorporate a 700-Vpower FET and a controller that process operating information from the flyback auxiliary windingand power FET to provide a precise output voltage and current control. The integrated high-voltage current source for startup that is switched off during device operation, and the controller current consumption is dynamically adjusted with load. Both enablethe very low stand-by power consumption.

Control algorithms in the UCC28910 and UCC28911, combining switching frequency and peakprimary current modulation, allow operating efficiencies to meet or exceed applicable standards.Discontinuous conduction mode (DCM) with valley switching is used to reduce switching losses.Built-in protection features help to keep secondary and primary component stress levels in check across the operating range. The frequency jitter helps to reduce EMI filter

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Technical documentation

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Type Title Date
* Data sheet UCC28910, UCC28911 High-Voltage Flyback Switcher with Primary-Side Regulation and Output Current Control datasheet (Rev. D) PDF | HTML 19 Dec 2016
Application note Flyback Aux Winding OVP and UVLO Fault Sensing Design and Troubleshooting Tips PDF | HTML 31 Aug 2021
Technical article Overcoming common design challenges in an UV sterilization box system 27 Jul 2020
Technical article Making a solar inverter more reliable than the sun 01 Aug 2017
Application note Troubleshooting TI PSR controllers 03 Oct 2016
Technical article Differences between PSR and SSR in bias power-supply design 08 Apr 2016
Technical article Design an energy-efficient, lower-acoustic cooker hood with an elegant user interface 29 Mar 2016
White paper Control Challenges for Low Power AC/DC Converters 02 Oct 2015
White paper Control Challenges for Low Power AC/DC Converters (PPT) 02 Oct 2015
EVM User's guide Using the UCC28911EVM-718 06 Mar 2015

Design & development

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Evaluation board

UCC28911EVM-718 — UCC28911 Evaluation Module

The UCC28911EVM-718 evaluation module is an offline Flyback power supply that provides isolated output voltage and current regulation without the use of an optocoupler and secondary-side feedback components. The input accepts a voltage range of 85VAC to 265VAC, 47Hz to 64Hz. The evaluation module (...)

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Support software

PMP4367 — Universal AC Input 6W Adapter with Energy Star 6 Efficiency Rating

This 5V / 1.2A adapter solution is fully test and passes EMI and EMC (CE,RE) safety requirements. It implements a high efficiency primary side controller UCC28910. The efficiency of the design complies with Energy Star 6 and is designed to fit into small form factor housing. The design measures (...)
Calculation tool

UCC28911 Design Calculator (Rev. A)

SLUC624A.ZIP (91 KB)
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