High Power Flyback Controller with Primary-Side Regulation and Peak Power Mode - UCC28630


High Power Flyback Controller with Primary-Side Regulation and Peak Power Mode

Related Terms

  • Power Supply Peak Power
  • High Power Primary Side Regulation
  • High Efficiency
  • Light load efficiency
  • No load power consumption


The UCC28630 targets high-power, primary-side regulated flyback converters. The powerful gate driver and ability to operate in both CCM and DCM make the device suitable for applications with a wide power range. The peak power mode allows transient peak power delivery up to 200% of nominal rating, with only a 25% peak current increase, maximizing transformer utilization.

The transformer bias winding is used to sense output voltage for regulation, and for low-loss input voltage sensing. Advanced sampling and processing techniques allow CCM operation, and deliver excellent output voltage regulation performance for opto-coupler-less designs at power levels of 100 W and above.

A high-voltage current source enables fast and efficient start-up. Advanced light-load modes are deployed (including switching frequency modulation and device sleep modes) to reduce both controller and system power consumption at no load and light load. These modes enable potential system designs to meet 30-mW no-load power for power designs up to 30 W nominal, 60 W peak.

The device has been designed for ease-of-use and incorporates many features to enable a wide range of designs. Extensive protection features are included to simplify system design.


  • High-Power, Primary-Side Regulation for Output Voltage and Current, No Opto-Coupler Required
  • Continuous Conduction Mode (CCM) and Discontinuous Conduction Mode (DCM) Operation
  • Built-In 700-V Start-Up Current Source
  • Active X-Capacitor Discharge Function
  • Constant-Current (CC) Mode Limiting
  • High Gate Drive Current 1-A Source and 2-A Sink
  • Low Power Modes for <30-mW System Standby
  • Best-In-Class Light Load (10%) Efficiency >85% for 65-W Nominal Power Design
  • Peak-Power Mode for Transient Overload
  • Shutdown Terminal Interface for External NTC
  • Protections: Overvoltage, Overcurrent, Over-Temperature, Overload Timer, AC Line UV, Brownout and Terminal Protections
  • Frequency Dither to Ease EMI Compliance

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Parametrics Compare all products in PWM and Resonant Controller

Control Method
Duty Cycle (Max) (%)
Frequency (Max) (kHz)
UVLO Thresholds On/Off (V)
Operating Temperature Range (C)
Approx. Price (US$)
-40 to 125    
0.60 | 1ku    

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Companion parts

Part # Name Product Family Comments
UCC28910   700V Flyback Switcher with Constant-Voltage Constant-Current and Primary-side Control   AC/DC AND ISOLATED DC/DC POWER SUPPLY - PWM AND RESONANT CONTROLLER    
UCC24610   Secondary Side Synchronous Rectifier Controller   AC/DC AND ISOLATED DC/DC POWER SUPPLY - Gate Driver    
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