EEVblog Electronics Community Forum
Electronics => Projects, Designs, and Technical Stuff => Topic started by: blueskull on January 27, 2016, 06:12:02 am
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I'm in the process of a double pulse MOSFET tester project, which conventionally uses an inductor to regulate current through DUT, as shown below.
(https://www.eevblog.com/forum/projects/fast-current-source/?action=dlattach;attach=197198)
First, the DUT turns on for a given time, charging the inductor to a certain current, then turns off and on fast, hence the name of double pulse. Since the current of an inductor won't change (drastically over short time), I can get pretty stable current during the double pulse testing, and this circuit is used as industrial standard to test power MOSFET switching characteristics.
I'm thinking if I can use a pulsed MOSFET current source to do the test, so to eliminate the need of an inductor. This will make my design more flexible and programmable, like this.
(https://www.eevblog.com/forum/projects/fast-current-source/?action=dlattach;attach=197200)
Do you think this design will work? LTSpice says okay, but I've never built this. I intend to pulse 6 parallel connected 25mR SiC MOSFET devices (each device gets 167A) rated at 250A surge capability. By calculation, these devices can do higher current, but due to ohmic voltage loss, current regulation will be worse.