Help understanding Current Sense MOSFET

[Tobias]

Henrik
Thanks for the input. One question, how do I get negative supply to the op-amp? What part number do you suggest?
Thanks again

[Tobias]

I think I found a good one





DCP010507DBP-UE4

[HenrikOlsson]

Hi,
That DC/DC converter should work but remember that it's isolated so you'll need to connect its negative input to it's positive output. Here's an alternative aproach that I found in an ON Semiconductor application note on current sensing MOSFETs:


/Henrik.