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Overvoltage Protection Circuit : Damaging buck converter

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Saboteur94:

--- Quote from: MasterTech on November 27, 2021, 10:18:40 am ---
--- Quote from: Saboteur94 on November 27, 2021, 09:20:37 am ---Average output current from the converter is 3A at 5V. However,the input voltage to this the system will be 11V at a minimum so the current through BLM21 will be less than 2A majority of the time owing the "buck" effect.

--- End quote ---

Ok, but at 1.5A or more passing thru that BLM21 its inductance is going to drop quite a lot nulling its filtering effect. You should find a 3 or 4A rated ferrite if you want to maintain a its HF filtering specs. This is described also in the PDF I linked.

--- End quote ---

Noted,will definitely ammend accordingly.Thanks

PartialDischarge:
Another point, don't know if your input diode S3M is put on purpose for some reason, but it will dissipate more than 1W which seems unnecessary. You could use a schotky diode to reduce it to 1/2 or a PMOS to even reduce it further.

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