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Overvoltage Protection Circuit : Damaging buck converter

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--- 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.

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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.

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Noted,will definitely ammend accordingly.Thanks

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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