I am currently using LTC7803EUD to convert 24V to 12V/25A. I use a 1.5mOhm current shunt to set the 25A trip threshold but the current limit was actually 17A. I see that in the datasheet (page 27) the design example which sets the current limit at 20A calculated the Rsense to be around 2mOhm, and looking at the EVB, which is an identical circuit using 1mOhm instead. I tested the EVB and indeed the current limit is 20A. So now I am a little confused, where did I get wrong?
My MOSFETs settings are identical to the EVB, the inductor I use is Wurth 744364047B and I set the switching frequency to 120Khz.
I have tried tinkering with the SENSE RC filter but still don't get much out of it. Am I missing out on anything?