FTM Board Club
5 V / 0.6 A Buck converter based on VIPER319X

The STEVAL-VP319X1B evaluation board implements a 5V/3W Buck converter developed for general purpose applications, operating from 85 to 265VAC.

Click to request a related board:

  • STEVAL-VP318L1F for secondary-side regulation (SSR)

  • STEVAL-VP318L2F for primary side regulation (PSR)  

If the size of the input bulk capacitors is increased, the evaluation board is able to supply the 3 W in extended range (40 – 265VAC). 

The reference design is built around the new VIPERP319X, an offline high-voltage converter of the VIPERPlus family with 800 V avalanche-rugged Power MOSFET, PWM current-mode control, fixed 30 kHz switching frequency with jittering to satisfy electromagnetic disturbance standards, burst mode for light load management.

The main features of the evaluation board are: small size, minimal BOM, high efficiency, low stand-by consumption.

  • Universal input mains range: 85–265VAC
  • Frequency: 50-60 Hz
  • Output voltage: 5 V
  • Output current: 0.6 A
  • Input power consumption in no load condition: < 16 mW at 230VAC
  • 4-point average active mode efficiency at full load: >69.7% (compliant with European CoC v5)
  • 4-point average active mode efficiency at 10% full load: >60.58% (compliant with European CoC v5)
  • Meets IEC55022 Class B conducted EMI
  • RoHS compliant