High idle power revisited

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Solar Mike

Joined: 08/02/2015
Location: New Zealand
Posts: 1130
Posted: 11:09am 06 Sep 2023      

Those IRFP44XX series mosfets have a multiple die arrangement inside them, the resulting large gate charge characteristic requires a very meaty gate driver; as you have 4 in parallel then perhaps your driver chip or transistor buffer cannot supply enough current to get them to switch quickly, needs to supply >10 amps peak @12v.

As Poida say's you need a good scope to test this.