Constant-Voltage, Constant-Current PWM Controller with Primary-Side Regulation - UCC28710


Constant-Voltage, Constant-Current PWM Controller with Primary-Side Regulation


The UCC2871x family of flyback power supply controllers provides isolated-output Constant-Voltage (CV) and Constant-Current (CC) output regulation without the use of an optical coupler. The devices process information from the primary power switch and an auxiliary flyback winding for precise control of output voltage and current.

An internal 700-V start-up switch, dynamically-controlled operating states and a tailored modulation profile support ultra-low standby power without sacrificing start-up time or output transient response.

Control algorithms in the UCC28710 family allow operating efficiencies to meet or exceed applicable standards. The output drive interfaces to a MOSFET power switch. Discontinuous conduction mode (DCM) with valley switching reduces switching losses. Modulation of switching frequency and primary current peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load and line ranges.

The controllers have a maximum switching frequency of 100 kHz and always maintain control of the peak-primary current in the transformer. Protection features help keep primary and secondary component stresses in check. The UCC28710, UCC28714 and UCC28715 allow the cable compensation to be programmed. The UCC28711, UCC28712 and UCC28713 devices allow remote temperature sensing using a negative temperature coefficient (NTC) resistor while providing fixed cable-compensation levels.


  • < 10-mW No-Load Power
  • Primary-Side Regulation (PSR) Eliminates Opto-
  • ±5% Voltage and Current Regulation Across Line
    and Load
  • 700-V Start-Up Switch
  • 100-kHz Maximum Switching Frequency Enables
    High-Power Density Charger Designs
  • Quasi-Resonant Valley-Switching Operation for
    Highest Overall Efficiency
  • Frequency Jitter to Ease EMI Compliance
  • Wide VDD Range Allows Small Bias Capacitor
  • Clamped Gate-Drive Output for MOSFET
  • Overvoltage, Low-Line, and Overcurrent
    Protection Functions
  • Programmable Cable Compensation (UCC28710,
    UCC28714 and UCC28715)
  • NTC Resistor Interface (UCC28711, UCC28712
    and UCC28713) with Fixed Cable Compensation
  • SOIC-7 Package

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Parametrics Compare all products in Flyback Controller

Control Method
Duty Cycle (Max) (%)
Frequency (Max) (kHz)
UVLO Thresholds On/Off (V)
Special Features
Operating Temperature Range (C)
Package Group
Estimated Package Size (WxL) (mm2)
Approx. Price (US$)
Green Mode
HV Start-up
Input Line Monitor
Leading Edge Blanking
Light Load Efficiency
Low Power
Soft Start    
-40 to 125    
7SOIC: 3.91 x 4.9: 29 mm2    
0.42 | 1ku    
AC Frequency 60 Hz 50 Hz
    Min   Max   Range  
  VinRMS V    85.00 – 265.00V  
  Vout V    5.00 – 25.00V  
  Iout A    ≤ 4.00A  
  Ambient Temp °C    ≤ 100°C  
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