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Maybe a stupid question. It's a super simple circuit: 25 V input, a GaN and a 10 Ω load — I didn't include the driving circuit, but I'm switching at 100 kHz. Why at the drain I have 12 A and through the load 2.5 A (as I expected)? What happens with that current (12 A), is it dissipated? Is the GaN model not accurate enough in LTspice?

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JYelton
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PosFLo
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  • Please show oscillograms. Is anything else connected to souce? – winny May 26 '23 at 10:44
  • May be it is some transient current that is going from drain to gate if you are switching the gate too fast. – sai May 26 '23 at 10:49
  • The mosfet symbol is kind of confusing, where does "source" go, if anywhere? – Lundin May 26 '23 at 10:53
  • A source for G1 is not shown so Vgs is undefined and the transistor floats, likely destroying itself. – Tim Williams May 26 '23 at 10:59
  • Current cannot be dissipated. That would violate fundamental physics such as conservation of charge. LTspice never dissipates any current. – tobalt May 26 '23 at 11:31
  • Do you have other lines that use the node name "Source"? What method are you using to measure the currents? – Nedd May 26 '23 at 12:25
  • I didn't show the driving circuit for the FET, but the problem was I was using it in a different place as well without noticing. Thanks – PosFLo May 26 '23 at 13:16
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    Easily done but you know something else to look for next time. Can I recommend that you delete the question as it's moot and very unlikely to be useful to anyone else. – TonyM May 26 '23 at 13:55

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