UCC28910

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

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Product details

Parameters

Control method Current Output power 85-265 Vac (Max) (W) 7.5 Output power 175-265 Vac (Max) (W) 9.5 Vin (Min) (V) 30 Topology Buck, Flyback Duty cycle (Max) (%) 99 Frequency (Max) (kHz) 115 UVLO thresholds on/off (V) 9.5/6.5 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

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
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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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Technical documentation

Design & development

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

Hardware development

EVALUATION BOARDS Download
document-generic User guide
$99.00
Description

Universal input 5V, 6W isolated flyback power supply with primary side control

Features
  • 5V, 6W isolated, universal input, CV, CC flyback power supply
EVALUATION BOARDS Download
UCC28911 Evaluation Module
UCC28911EVM-718
document-generic User guide
$99.00
Description

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 (...)

Features
  • Isolated 7.5W, 5V output
  • Less than 20mW standby power consumption
  • Primary side regulation eliminates opto-coupler
  • Universal off-line input voltage range
  • Output over voltage protection
  • Input under voltage protection
  • Thermal Shutdown
  • Controlled start up and restart after fault Protection

Design tools & simulation

CALCULATION TOOLS Download
SLUC503B.ZIP (91 KB)

Reference designs

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CAD/CAE symbols

Package Pins Download
SOIC (D) 7 View options

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