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Fixed Frequency Current Mode PWM Controller

  • Fixed Frequency Current Mode PWM Controller
  • Fixed Frequency Current Mode PWM Controller

Reference Design Description

The NCP1247USBPDGEVB evaluation board is a flyback-topology switched-mode power supply designed for USB PD (power delivery) applications. The regulation of switched-mode power supply is ensured by the NCP1247 – a new fixed frequency current mode PWM controller with HV startup. The output voltage value (5 V, 12 V or 20 V) is set by the MCU controller CYPD1132-16SXI. The CCG1 Host Board from Cypress Semiconductor can be used for an easy demonstration how the power supply for USB PD application works. Communication between the NCP1247USBPDGEVB evaluation board and CCG1 Host Board is ensured by a USB Type-C cable (it uses the CC wire for communication and the VBUS wire for energy transmission).


  • Works in input voltage range from 90 Vac to 265 Vac
  • Provides the output voltages 5 V, 12 V and 20 V up to 3 A of output current
  • Uses NCP1247 part that features:
    • Frequency foldback and skip mode
    • Timer-based overload protection with latched (A version) or auto-recovery (B version) operation
    • High-voltage startup with dynamic self supply
    • Integrated brown-out detection
    • Frequency Modulation
    • Adjustable overpower protection
    • Latch off input