Electronics > Projects, Designs, and Technical Stuff

Exploding IC in buck converter

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magic:
I wonder if it would be feasible to cascode the converter with a depletion FET whose gate is pulled to the input by a resistor and clamped to ground by a low power TVS/zener? I mean, if you really can't find a converter with suitable ratings...

Teun:
Well it's not that I don't want to use other converters. My boss keeps coming up with cheap ones he finds online and he expects me to to just use them ::)

But al least it gives me another reason to try and convince him otherwise ;)

Thanks for the help so far!

Gyro:
Do you have any resistance in series with the supply. I know you'll drop the efficiency a bit but, for example, a 1 Ohm 5-10W wirewound resistor (higher resistance if possible) in series with the input (after the fuse but before any reservoir capacitance) will significantly improve any clamping measures by limiting the peak transient current. It's also the sort of thing that could be retrofitted outside the unit (or clamped to the inside of the case if metal).

This, in combination with the lower suggested TVS voltage rating, might get you past the problem.

Siwastaja:

--- Quote from: Teun on April 02, 2020, 10:19:19 am ---Well it's not that I don't want to use other converters. My boss keeps coming up with cheap ones he finds online and he expects me to to just use them ::)

--- End quote ---

Well someone needs to do the design math, this is engineering and you can't just slap random parts together. It's not rocket science. If you are the responsible designer, do the math, show it, and just say "no" if that is the truth. It should be the end of discussion.

Alti:

--- Quote from: Siwastaja on April 02, 2020, 11:20:44 am ---
--- Quote from: Teun on April 02, 2020, 10:19:19 am ---Well it's not that I don't want to use other converters. My boss keeps coming up with cheap ones he finds online and he expects me to to just use them ::)
--- End quote ---
If you are the responsible designer, do the math, show it, and just say "no" if that is the truth. It should be the end of discussion.
--- End quote ---
:bullshit: If your boss's decision was to use component X then use component X.

Such decision frees you from doing the math necessary for component selection process and speeds up work. The disobedience and wasting your time for formally proving your boss makes poor decisions is not your job, you are an ee and not a babysitter.

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