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Registered Member #639
Joined: Wed Apr 11 2007, 09:09PM
Location: The Netherlands, Herkenbosch
Posts: 512
I've built Steve Wards high side gate drivers acording to this schematic:
I'm using these fet's:
I just started testing them with a 22 ohm resistor for R7 but somehow there's a strange transission in the speed it turns the cm-300 module on. Here's a trace of the gate voltage is this normal? If not what could be the problem
Registered Member #1819
Joined: Thu Nov 20 2008, 04:05PM
Location:
Posts: 137
That small flat area on the trace is called the Miller plateau; behavior such as this is entirely normal for both MOSFETs and IGBTs. If it's bothering you, a stronger gate driver or one with TrueDrive technology can help overcome this plateau.
Registered Member #639
Joined: Wed Apr 11 2007, 09:09PM
Location: The Netherlands, Herkenbosch
Posts: 512
Ok thanks guys, I just wanted to be sure since it's the first high side driver I'm using now. Going to power the coil up in a few hours so expect some sparks comming the forums way
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
Hi i making IGBT driver for my HF DRSSTC. even for IGBT gate, my driver using 15W (Cgs=4.3uC) of power i am using STD12NF06 and STD10PF06, and wave form is pretty good it was 2Rg, i can't use more, because i will have same as you ( Vgs )
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High side gate driver q's
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