Electrical / Electronic Theory and Learning Center > Learning Center Miscellaneous
MOSFET driver issue
Grumpy:
I'm using an IXDF604PI (see attached) MOSFET driver to drive a IXTH02N450HV (see attached) MOSFET.
Low-side driving, 130k resistor at voltage source.
I apply 300vdc. I can measure 300vdc at the MOSFET.
When I apply power to the driver, the 300vdc voltage drops to about 10vdc. I don't see a signal at the gate when this happens.
This is even with the driver input connected to a signal generator or disconnected (floating).
10 k-ohm resistor gate to source, 100 ohm resistor between driver and gate.
When the driver is turned off, the voltage returns to 300vdc.
What could be wrong?
Grumpy:
I'm using a AHV12V4KV2R5MAW power supply, and 6 of the drivers (6 channels).
Now, I'm thinking my 12v power supply is too low of current since only 1A. A single driver worked fine when I tested it a couple of weeks ago.
Hakasays:
Do you have the driver input side biased to ground as well? I've had gate drivers that needed to be clamped with a 10-100k ohm pulldown resistor.
Grumpy:
--- Quote from: Hakasays on 2022-09-11, 05:51:32 ---Do you have the driver input side biased to ground as well? I've had gate drivers that needed to be clamped with a 10-100k ohm pulldown resistor.
--- End quote ---
Will try tomorrow.
Grumpy:
--- Quote from: Hakasays on 2022-09-11, 05:51:32 ---Do you have the driver input side biased to ground as well? I've had gate drivers that needed to be clamped with a 10-100k ohm pulldown resistor.
--- End quote ---
Thanks Hakasays!
This was the issue. 10k at the input to ground and it shuts off when floating. They could have mentioned this in the datasheet...
Funny thing is that I had a 10k at the input when I tested it and then forgot the 10k at the gate, so I moved it.
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