Peak diode recovery voltage slope of transistor

[emie]

Hello,

I had made a circuit with a transistor driven by pulse signal,
But my problem is that the output voltage has a peak value of 2V for some nanoseconds.

My question is how to minimize the value of peaks?
Is this by choosing a transistor with min Peak diode recovery voltage slope?

Best regards,

Emie

 

[FvM]

Are you talking about MOSFETs and substrate diode reverse recovery? Otherwise please clarfiy.

Reverse recovery voltage slope of MOSFETs is a maximum ratings parameter, a value that most no be exceeded to avoid device damage. I don't think that it's related to your problem.

 

[emie]

I think that I confused definitions,
My problem is that the output voltage of my transistor has peaks,
And I can't identify the origin of that?

 

[FvM]

In this case, please show the circuit and measurement results.

 

[emie]

That is my signal

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This my circuit

 

[FvM]

Correct the circuit. Now the transistor is shorting the power supply. What do you intend, buck- or boost-converter?

Small current spikes can be expected, I guess you have set unreasonable fast rise- and fall-times of the gate pulse.

 

[emie]

I want to make a buck of course without spikes.
What I can do: I must change the transistor with low rise time dans fall time?

 

[FvM]

I want to make a buck.

Then you should correct the circuit to a buck converter topology. The positions of transistor and diode have to be flipped.

To say anything meaningful about the "spikes", we need to know the real circuit parameters and device types.