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MOSFET Switching speed

MrSun , 09-06-2021, 11:28 PM
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?

qdrives , 09-08-2021, 08:19 AM
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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