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.
| Part Number | Description | |
|---|---|---|
| STEVAL-DPSTPFC1 | 3.6 kW PFC totem pole with inrush current limiter reference design using TN3050H-12WY and SCTW35N65G2V |
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Key Features
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3.6 kW PFC totem pole with inrush current limiter reference design using TN3050H-12WY and SCTW35N65G2V
Development Tools
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Picture Part number Manufacturer Description ST MOSFET Finder ST MOSFET product finder application for Android and iOS 
ST-DIODE-FINDER ST Diode product finder application for Android and iOS ST-VREG-FINDER ST Linear and switching voltage regulators and voltage reference applications for smartphones and tablets Part NumberMOSFET product finder application for Android and iOS
Diode product finder application for Android and iOS
Linear and switching voltage regulators and voltage reference applications for smartphones and tablets
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eDesignSuite
Diodes and Rectifiers
| Part number | Description |
|---|---|
| FERD20U60DJFD | 60 V, 20 A PowerFLAT Ultra-Low Vf Field-Effect Rectifier Diode (FERD) |
| FERD40H100S | 100 V, 40 A Field-Effect Rectifier Diode (FERD) |
| STPS10150C | 150 V, 10 A dual Power Schottky Rectifier |
| STPS1045DEE | 45 V, 10 A PowerFLAT Power Schottky Rectifier |
| STTH108 | 800 V, 1 A Ultrafast Diode |
| STTH112 | 1200 V, 1A Ultrafast Diode |
| STTH15RQ06 | 600 V, 15 A Turbo 2 Soft Ultrafast Recovery Diode |
| STTH30RQ06 | 600 V, 30 A Turbo 2 Soft Ultrafast Recovery Diode |
Power Management
| Part number | Description |
|---|---|
| HVLED001A | Offline controller for LED lighting with constant voltage primary-sensing and high power factor |
Power Transistors
| Part number | Description |
|---|---|
| STB38N65M5 | N-channel 650 V, 0.073 Ohm typ., 30 A MDmesh M5 Power MOSFET in D2PAK package |
| STB5N80K5 | N-channel 800 V, 1.50 Ohm typ., 4 A MDmesh K5 Power MOSFET in a D2PAK package |
| STF24N60M2 | N-channel 600 V, 0.168 Ohm typ., 18 A MDmesh M2 Power MOSFET in TO-220FP package |
| STL110N10F7 | N-channel 100 V, 5 mOhm typ., 107 A STripFET F7 Power MOSFET in a PowerFLAT 5x6 package |
| STL130N8F7 | N-channel 80 V, 3.0 mOhm typ., 120 A STripFET F7 Power MOSFET in PowerFLAT 5x6 package |
