A previous post tells that in the choice of the O-ring FET.
The OR-ing FET selection is based on the Ron of the FET.
The TPS23523 device will regulate the forward drop across the OR-ing FET to 25 mV. So, the selected FET should have Ron to result 25mV drop across the FET for proper regulation while delivering nominal load current.
For example for 10A load, FET Ron should be 2.5mOhm
But TPS23523 EVM is using 2x BSC320N20NS3GATMA1 FET, with a max 32mOhms rdson, so divide by 2 FET it's 16mOhms. with a current load at 12.5A, this mean 200mv drop and not 25mV.
We are wondering where the 25 mV specification comes from. Is it an arbitrary value set by internal voltage references or does it come from somewhere else ?
What happens if the condition is not respected (i.e. 200mV drop like the EVM?) ?
Does it cause damage to the IC ?
What is the impact of not having 25mV drop?
In fact we are still trying to understand what the IC does to regulate the 25mV and why...
Thanks
