Hi team,
I have a customer looking for a FET that will be used in a heating coil application.
the max current draw through the FET is 3A and must be able to handle 15W.
I am trying to understand which of our FETs can handle this. under the datasheet for CSD19538Q2, i see 2.5W max dissipation and 20.2W for Tc = 25C. the 20.2W calculation seems really optimistic with a constant case temp of 25C when in reality it should rise with increasing current.
Assuming no heatsink, should i be using R_theta_JC or R_theta_JA in the calculation for whether the FET can handle 15W?
what is the recommended solution for 15W at the smallest solution size possible?
Thanks,
Kevin