Mosfet Blown up

[Ankit_singh]

I was using n channel power mosfet 

AUIRFP4110.

by applying Vgs=12 V (in series  with 1k resistor) , Parallel resistance between GS was 1K(for fast switching), Vds=50 V .

Mosfet was working fine till 5 Amp load & switching was too good but when I switched the load to 10 Amp ; the mosfet got blown up immediately. Testing scenario was within the specified range as per datasheet ; please let me know your valuable thoughts to rectify this problem.

Regards,

Ankit Singh

[vigneshkumar]

Hi Ankit,

Thanks for posting in Infineon community.

Could you please share driver detail and frequency of operation?

Regards,

Vignesh kumar.

[Ankit_singh]

I was not using any gate driver ; I had just applied isolated 12V DC as Vgs
through 1k resistor.

--
Best Regards,
Ankit Singh
Electrical Engineer

Phone no. - (+91)9458707512

[vigneshkumar · Accepted solution]

Hi Ankit,

Problem summary as per the discussion we had with you :

MOSFET (AUIRFP4410) blown up while loaded at 10A it was working fine when loaded with 5A. No frequency involved it was one time Turn-ON. Load increased with Rheostat.12VDC Applied to gate through Rg - 1k, Rgs- 1k. Vds- 50V. heat sink details -Unknown. please correct if anything is wrong.

 This could be the Possible cause .

 Rg and Rgs will act as Voltage Divider, Effective voltage at gate would be 6V, lesser the gate voltage higher the Rds-on, which will generate more heat. MOSFET may fail if there is no heatsink used.

   Solution: Rg value should be reduced and add a suitable heatsink. Pls Refer Gate resistor selection.

We can figure out exact issue if you share test setup detail and Vgs, Vds voltage waveform.

Regards,

Vignesh kumar