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Original question:

How to go about designing a snubber circuit for a pushpull design

How to go about designing a snubber circuit for a pushpull design

Amal
Expert 1140 points

Can snubber play a major role in removing unwanted signals in the primary coil of the transformers? Doubting it as a major reason for heating of the mosfets in primary side of my design, will calculating the values of rc network help in reducing such a heating effect in the primary side power switching mosfets placed in pushpull topology?

  • 0
    TI__Mastermind 34465 points
    Hello Amal,
    The energy stored in the leakage inductance of the transformer of a push pull converter needs to be safely dissipated somewhere in the circuit.
    This is the job of the snubber and it does this by transferring this unwanted energy to a capacitor and dissipating it in a resistor. In the process , this snubber slows down the switching waveforms which lowers the power loss in the switching MOSFETS and/or diodes. That is the main function of a snubber. The snubber can be minimized by careful transformer design and a good pcb layout.

    Additionally decreasing the dV/dt of the switches is beneficial for EMI aspects but it does decrease the efficiency of the overall system.
    You will find several references on snubber design on the web. Attached is a TI seminar paper on snubbers that you will find useful.
    www.ti.com/.../slup100.pdf

    Regards
    John