Two Switch Flyback Converter  

In a two-switch flyback topology, a high-side power MOSFET – placed between the input voltage rail and the transformer – and snubber diode are added to help overcome the limitations of conventional flyback topology as the overall voltage stress is equally split between the two transistors. This is particularly valuable in high-voltage applications such as auxiliary power supplies supplied by a three-phase input rail. A dual-switch flyback topology also removes clamping losses by recycling the leakage energy to the input side via the two diodes, thus boosting efficiency and reducing thermal stress while clamping the maximum voltage stress of the power MOSFET to the input voltage.

We offer a range of controllers supporting quasi-resonant mode, power MOSFETs, diodes and protection devices as well as a range of hardware and software development and evaluation tools to help design high-efficiency two transistor flyback AC-DC converters.

two switch flyback converter circuit diagram

Technical Documentation

Application Notes
Description Version Size
AN1768 AN1768: ADMISSIBLE AVALANCHE POWER OF SCHOTTKY DIODES 1.1 46.82 KB
AN2025 AN2025: CONVERTER IMPROVEMENT USING SCHOTTKY RECTIFIER AVALANCHE SPECIFICATION 1.1 147.59 KB
AN604 AN604: Calculation of conduction losses in a power rectifier 3.2 137.74 KB
AN4021 AN4021: Calculation of reverse losses in a power diode 1.0 120.47 KB
AN1453 AN1453: NEW FAMILY OF 150V POWER SCHOTTKY 1.1 131.48 KB
AN5046 AN5046: Printed circuit board assembly recommendations for STMicroelectronics PowerFLAT™ packages 3.0 5.33 MB
AN5088 AN5088: Rectifiers thermal management, handling and mounting recommendations 2.0 2.32 MB
AN443 AN443: SERIES OPERATION ON FAST RECTIFIERS 2.1 202.48 KB
AN869 AN869: Tj max limit of Schottky diodes 2.2 60.9 KB
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Publications and Collaterals

Flyers
Description Version Size
600-650 V MDmesh™ M2: The ST’s new Super-junction HV MOSFET series 1.0 755.53 KB
800-1050V MDmesh™ K5: ST’s first Super-junction VHV MOSFET Series 1.0 1.76 MB
ST Diodes Finder : the new app for Android and iOS 2.0 1.46 MB
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Selection Guides
Description Version Size
Diodes and rectifiers selection guide 2.0 815.09 KB
Power MOSFET Selection Guide 1.0 1.21 MB
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Brochures
Description Version Size
Brochure Power management guide 10.2018 4.42 MB
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Development Tools
Software Development Tools

Power Management

Part Number Description
HVLED001A Offline controller for LED lighting with constant voltage primary-sensing and high power factor
STCH02 Offline PWM quasi resonant controller for ultra-low standby power supplies
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