STSPIN840 Current Limit Protection Tolerance

[mnguyen1]

For the current limiting circuit, what’s the tolerance of when the circuit triggers. Say I have my Vref at 1V and my RSNSA is 0.5 ohms. I’m expected to trip at 2A, but could I expect to trip at 1.9A? Thank you

[Peter BENSCH]

For 1V reference and a 0.5Ω shunt, the nominal current limit is 2A. The main uncertainty should be only a 15mV offset (see datasheet, table 5), so the trip threshold shifts by about: ​15mV/0.5Ω​​ = 30mA. That means the expected range would be roughly 1.97...2.03A. Of course, there are also other influences, such as additional tolerances including Vref accuracy, shunt tolerance, temperature drift, or noise at the SENSE1/2 pins.

Hope that helps?

Regards
/Peter