The single-switch forward converter represents a valid alternative to the single-switch flyback topology in isolated, off-line, step-down converters with high output current requiring galvanic isolation in the 100 to 300 W power range. Unlike flyback converters, in a forward converter energy transfers instantly to the transformer and does not rely on it for energy storage. Transformers can thus have higher magnetizing inductance and no air gap, providing better transformer utilization. The transformer’s secondary output is then L-C filtered to ensure lower output voltage ripple while peak current – and thus stress – on the active transistor is reduced.
On the flip side, compared to a flyback topology, the transformer must be reset after a few cycles to avoid saturation. In this case, a higher voltage rating for the primary power MOSFET, an extra output inductor and a freewheeling diode are needed.
We have a complete offer of primary-side PWM and synchronous rectification controllers, power MOSFETs and diodes together with a range of hardware and software evaluation and development tools including reference designs to help developers design high-efficiency, size optimized forward converters.
Development Tools
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Picture Part number Manufacturer Description ST MOSFET Finder ST MOSFET 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
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) |
| STTH2002C | 200 V, 20 A dual Ultrafast Diode |
| STTH3002C | 200 V, 30 A dual Ultrafast Diode |
| STTH6003 | 300V , 60 A dual Ultrafast Diode |
Power Transistors
| Part number | Description |
|---|---|
| STB5N80K5 | N-channel 800 V, 1.50 Ohm typ., 4 A MDmesh K5 Power MOSFET in a D2PAK package |
| STF140N6F7 | N-channel 60 V, 0.0031 Ohm typ., 70 A STripFET F7 Power MOSFET in a TO-220FP package |
| STF24N60M2 | N-channel 600 V, 0.168 Ohm typ., 18 A MDmesh M2 Power MOSFET in TO-220FP package |
| STH140N8F7-2 | N-channel 80 V, 3.3 mOhm typ., 90 A STripFET F7 Power MOSFET in H2PAK-2 package |
| STP40N60M2 | N-channel 600 V, 0.078 Ohm typ., 34 A MDmesh M2 Power MOSFET in TO-220 package |
