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Offline rckantaTopic starter

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MOSFET failure
« on: June 25, 2018, 02:51:46 am »
Am designed  inverter 12 to 200v

One MOSFET is driving from pin 11 of sg3525 this MOSFET is fail when I  turned on the inverter
And sometimes this MOSFET(irf3205)  is fail when I connect the load like 15 Watt
Sometimes this MOSFET explore and crack

Another MOSFET is working fine (driven from pin. 14)

How to fix this problem
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Offline NiHaoMike

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Re: MOSFET failure
« Reply #1 on: June 25, 2018, 03:07:39 am »
Do you have proper soft start and cycle by cycle current limiting?
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Offline rckantaTopic starter

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Re: MOSFET failure
« Reply #2 on: June 25, 2018, 03:16:07 am »
For the soft start I use 10uf it will give 0.5S delayed
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Offline NiHaoMike

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Re: MOSFET failure
« Reply #3 on: June 25, 2018, 03:34:17 am »
And what about the cycle by cycle current limit?
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Offline rckantaTopic starter

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Re: MOSFET failure
« Reply #4 on: June 25, 2018, 04:13:41 am »
There is some dead time
But there no current limiting ckt
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Offline NiHaoMike

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Re: MOSFET failure
« Reply #5 on: June 25, 2018, 04:18:11 am »
Well there's your problem. :) No surprise it's not robust against inrush.
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Offline GlennSprigg

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Re: MOSFET failure
« Reply #6 on: June 25, 2018, 12:42:35 pm »
Not static spike voltage problems with a 'MOS' device ??
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Offline rckantaTopic starter

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Re: MOSFET failure
« Reply #7 on: June 25, 2018, 02:15:15 pm »
I  think it is because of spike
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