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Snubbing the FET turn-off voltage in flyback converters

Posted: 13 Nov 2009     Print Version  Bookmark and Share

Keywords:snubbing FET  flyback converter  turn off voltage 

Here's a look at snubbing the FET turn-off voltage in the flyback converter. The flyback converter operates by storing energy in the primary inductance of a transformer and releasing the energy into the secondary when the MOSFET is turned off.

A snubber is often needed when the MOSFET is turned off as the transformer's leakage inductance will cause the drain voltage to rise above the reflected output voltage (Vreset). The energy stored in the leakage inductance can avalanche the MOSFET, so a voltage clamping circuit comprised of D1, R24 and C6 is added. The clamp voltage on this circuit is set by the amount of energy in the leakage and the power dissipation in the resistor. A lower value resistor will lower the clamp voltage, but will increase the power loss.

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