Primary Feedback CC/CV PWM Controller for Flyback Converters


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The R7711A is a current mode PWM controller which includes primary side voltage feedback technology. It controls the output voltage and current accurately without shunt regulator and photo coupler on secondary side to save the cost.R7711A is designed especially for low power purpose as charger of cell phones, PDAs..., and etc. Fruitful protections, such as UVP, OVP, current limit and OTP, minimize the external components. Ultra low start-up current and operating current of R7711A achieves the low power consumption in standby mode. The green mode operation of R7711A also meets the latest efficiency regulations.


  • Switching AC/DC Adaptor and Battery Charger
  • DVD Open Frame Power Supply
  • STB Power
  • Cell Phone Charger
  • Networking Power Supply
  • AC/CC isolation
  • PSR
Key Spec.
Status Active
Supply Voltage (min) (V) 8
Supply Voltage (max) (V) 21
Switching Frequency (typ) (kHz) 67
Frequency Adjustable No
Driver Souce Current (typ) (mA) 200
Driver Sink Current (typ) (mA) 200
Features Current Mode Control;Cycle-by-Cycle Current Limit;OCP;OVP;SCP;UVP
Package Type SOT-23-6
  • Primary Side Regulator (CC/CV)
  • Current Mode Control
  • Internal PWM Leading-Edge Blanking
  • Green-Mode PWM
  • Cycle-by-Cycle Current Limiting
  • OVP 27V on VDD Pin
  • Low Start-up Current
  • Output Over Voltage Protection
  • Built-in Constant Output Current Control
  • Built-in Frequency Jittering
  • Soft Driving for EMI Reduction
  • Programmable Cable Compensation
  • Internal Over Temperature Protection
  • RoHS Compliant and Halogen Free