Optimum placement of current shunt resistor

[mrinalmani]

Hello
I was wondering what will be a better placement for the current shunt resistor between the two diagrams shown below.
- Gate drivers and all other analogue sub-parts are ground referenced.

Thank you

 

[danadakk]

You seem to indicate you want low side sensing, I would
be inclined to place it directly in battery to its ground path
so it sees ALL current of totem pole, cap.

If you need a processor with precision A/D that can common
mode outside its supply rails, differentially, there are parts out there
than can do all this and more.


Regards, Dana.

 

[FvM]

You don't specify the purpose of your measurement, instantaneous or average LS transistor current.

 

[KlausST]

Hi,

I say: it depends:
* if you just are interested in the average current: place the shunt between battery and capacitor.
* if you are interested in instantaneous Mosfet current (short circuit protection, for example), then connect the shunt between capacitor and Mosfet.

Klaus