Hi,
I am designing a PCB based on XTR111 for the DIY universe.
From a previous post I found that the suggested specs for a MOSFET are:
Vgs >= +/-20V
Vds >= -60V
Id >= 1A
C-Gate <= 500pF
My question is:
Can I use a lower Id Mosfet?
What is the purpose of the 1A criteria? meaning, what problems may occur by using a -300mA MOSFET (or even lower)?
I understand that the C-Gate is about response speed.
Is there anything else that I should have in mind choosing a low cost BOM? (ie Rset is going to be a 0.1% with 50 ppm TC)
Is it a good practice to use a trim POT as an Rset?