How to design a transient-load generator?

[chanchg]

Transient-Load Generator

I am a newbie in Electronics Design... How to design a transient-load generator to test a Buck-Regulator output?

Thanks in advance..

 

[VVV]

Re: Transient-Load Generator

The easiest to build, and one of the best methods, in fact is to use a MOSFET that connects a load resistor across the output. The resistor is equal to Vout/Istep, where Istep is the desired change in output current.
So you will have one load that the buck normally sources power to (another resistor even) and in parallel with that you connect another, using the MOSFET.

The MOSFET should be drien by a square-wave from a generator, through a gate resistor. By changing the gate resistor you get different current rise times.

Though simple, this method is very effective and easy to implement.

 

[chanchg]

Re: Transient-Load Generator

Thanks VVV... But how by varying Gate resistor can we have different current rise time.. Can you please elaborate with an example?

Thanks