15W Quasi-Resonant Flyback AC-DC Power Supply – Reference Design

15W Quasi-Resonant Flyback AC-DC Power Supply – Reference Design

The STEVAl-ISA171V1 reference design from STMicroelectronics implements a 15 W ac-dc power supply designed in quasi-resonant flyback topology for a wide-range input voltage. Its key features are its small size and minimal bill of material, high efficiency and low standby consumption.

The core of the application is the VIPER35, the quasi-resonant offline high voltage converter from the VIPerPLUS product family.

The VIPER35 integrates an 800 V rugged power MOSFET with pwm current-mode control.

Extremely low consumption under no-load conditions is ensured thanks to burst mode operation that reduces the average switching frequency and minimizes all frequency-related losses.

The VIPER35 operates in quasi resonant mode, a feature that helps to meet the EMI standards.

Key Features:

  • Wide input voltage range: 90- to 264-Vac
  • Output voltage: 12V
  • Output current: 1.25A
  • Rated output power: 15W
  • Quasi resonant operation
  • Input power standby at 230Vac: < 30mW
  • Active mode efficiency: >82%
  • EMI: pre-compliance with EN55022-Class-B
  • RoHS compliant
STMicroelectronics NV
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Mike is the founder and editor of Electronics-Lab.com, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)

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