(accidentally) shorted a mosfet\'s drain and source...

[Michael Darrett]

For a project I noticed my Arduino PWM pump controller (basically just an Arduino, MOSFET, and protection diode) was behaving oddly, so I powered the pump directly from the 12V power supply, turning it off and on as needed manually.

I looked more closely at my breadboard, and noticed the drain and source were touching. The circuit had been running for a few minutes this way.

Did I damage my MOSFET, or is this ok?

Thanks,

Michael

 

[Michael Darrett]

On Monday, June 13, 2022 at 12:35:34 PM UTC-7, Michael Darrett wrote:

For a project I noticed my Arduino PWM pump controller (basically just an Arduino, MOSFET, and protection diode) was behaving oddly, so I powered the pump directly from the 12V power supply, turning it off and on as needed manually.

I looked more closely at my breadboard, and noticed the drain and source were touching. The circuit had been running for a few minutes this way.

Did I damage my MOSFET, or is this ok?

Thanks,

Michael

It\'s a PSMN022-30PL, driven by a 12V, 3A power supply, if it matters.

Thanks,

Michael

 

[Dan Purgert]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

Michael Darrett wrote:

On Monday, June 13, 2022 at 12:35:34 PM UTC-7, Michael Darrett wrote:
For a project I noticed my Arduino PWM pump controller (basically
just an Arduino, MOSFET, and protection diode) was behaving oddly, so
I powered the pump directly from the 12V power supply, turning it off
and on as needed manually.

I looked more closely at my breadboard, and noticed the drain and
source were touching. The circuit had been running for a few minutes
this way.

Did I damage my MOSFET, or is this ok?



It\'s a PSMN022-30PL, driven by a 12V, 3A power supply, if it matters.

That\'s an N-channel FET, so having gate shorted to source (i.e. ground)
simply means it\'ll never turn on. I\'d be more concerned that the short
damaged the arduino\'s pin.


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--
|_|O|_|
|_|_|O| Github: https://github.com/dpurgert
|O|O|O| PGP: DDAB 23FB 19FA 7D85 1CC1 E067 6D65 70E5 4CE7 2860

 

[Dan Purgert]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

Dan Purgert wrote:

Michael Darrett wrote:
On Monday, June 13, 2022 at 12:35:34 PM UTC-7, Michael Darrett wrote:
For a project I noticed my Arduino PWM pump controller (basically
just an Arduino, MOSFET, and protection diode) was behaving oddly, so
I powered the pump directly from the 12V power supply, turning it off
and on as needed manually.

I looked more closely at my breadboard, and noticed the drain and
source were touching. The circuit had been running for a few minutes
this way.

Did I damage my MOSFET, or is this ok?



It\'s a PSMN022-30PL, driven by a 12V, 3A power supply, if it matters.

That\'s an N-channel FET, so having gate shorted to source (i.e. ground)
simply means it\'ll never turn on. I\'d be more concerned that the short
damaged the arduino\'s pin.

*sigh* totally misread as gate-source, not drain-source. (note to self,
coffee before Usenet).

A drain-source short is more likely to ruin your power supply, not the
fet (the leads will act as wires, no current will flow through the FET
itself).


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--
|_|O|_|
|_|_|O| Github: https://github.com/dpurgert
|O|O|O| PGP: DDAB 23FB 19FA 7D85 1CC1 E067 6D65 70E5 4CE7 2860

 

[Phil Hobbs]

Michael Darrett wrote:

On Monday, June 13, 2022 at 12:35:34 PM UTC-7, Michael Darrett wrote:
For a project I noticed my Arduino PWM pump controller (basically just an Arduino, MOSFET, and protection diode) was behaving oddly, so I powered the pump directly from the 12V power supply, turning it off and on as needed manually.

I looked more closely at my breadboard, and noticed the drain and source were touching. The circuit had been running for a few minutes this way.

Did I damage my MOSFET, or is this ok?

Thanks,

Michael


It\'s a PSMN022-30PL, driven by a 12V, 3A power supply, if it matters.

Thanks,

Michael

Should be OK from an electrical POV--the pump limits the current. Of
course, something may have got damaged by whatever mechanical trauma
caused the short.

Cheers

Phil Hobbs

 

[Michael Darrett]

On Tuesday, June 14, 2022 at 6:20:13 AM UTC-7, Phil Hobbs wrote:

Michael Darrett wrote:
On Monday, June 13, 2022 at 12:35:34 PM UTC-7, Michael Darrett wrote:
For a project I noticed my Arduino PWM pump controller (basically just an Arduino, MOSFET, and protection diode) was behaving oddly, so I powered the pump directly from the 12V power supply, turning it off and on as needed manually.

I looked more closely at my breadboard, and noticed the drain and source were touching. The circuit had been running for a few minutes this way.

Did I damage my MOSFET, or is this ok?

Thanks,

Michael


It\'s a PSMN022-30PL, driven by a 12V, 3A power supply, if it matters.

Thanks,

Michael

Should be OK from an electrical POV--the pump limits the current. Of
course, something may have got damaged by whatever mechanical trauma
caused the short.

Cheers

Phil Hobbs

Thanks Phil and Dan.

On my breadboard, the wires going to the drain and source had too much insulation removed before going into the breadboard, and they simply crossed. After noticing, I moved them further away from each other. I was more worried about whether I could rely on the mosfet again than in the power supply, but thanks Dan for the caution that the power supply could be damaged. It\'s just a run-of-the-mill power supply which (I think) powered a cable TV box or something similar, which has long since been lost.

Have a great one!

Michael