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MOSFET Switching speed

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  • MOSFET Switching speed

    Hi,everyone:
    Here is a load transient tool RD0004 from Richtek,in the schematic R3 and D2 can adjust the rise time of Q1,the rise time is about 500nsec,how to calculate the rise/fall times?

    Click image for larger version

Name:	RD0004.png
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ID:	18345

  • #2
    You need values of:
    - gate charge
    - miller plateau voltage
    - gate resistance
    - forward voltage diodes (in this case)
    - output voltage driver
    - etc.

    Or the more easy method:
    Use the SPICE models in an LTspice schematic and see the output plot. With 500ns you do not need a SPICE model of the driver.

    Oh, and C2 also adjusts the rise/fall time.

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