Product
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UCC28911
  • UCC28911

UCC28911

ACTIVE

700V Flyback switcher with constant-voltage constant-current and primary-side regulation

Texas Instruments UCC28911 Product Info

1 April 2026 4

Parameters

Rating

Catalog

Topology

Buck, Flyback

Iout (max) (A)

0.7

Vin (max) (V)

450

Vin (min) (V)

10

Vout (max) (V)

18

Vout (min) (V)

3.3

Features

Adjustable switching frequency, Current limiting, Green mode, High voltage startup, High-voltage startup, Input line monitor, Integrated Switch, IoT compatible, Leading edge blanking, Light load efficiency, Light-load efficiency, Overcurrent protection, Overtemperature protection, Soft start, Thermal shutdown

Control mode

Current, Primary-side regulation, Voltage

Switching frequency (min) (kHz)

0.42

Switching frequency (max) (kHz)

115

Operating temperature range (°C)

-40 to 125

Iq (typ) (µA)

23500

Duty cycle (max) (%)

99

Package

SOIC (D)-7-29.4 mm² 4.9 x 6

Features

  • 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

Description

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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