Hello,
I am working on a PWM TEC driver circuit, DRV8842 meets all the requirements of the circuit, but I also found one issue. First of all, I set I4:0 to 11011, set VREF = 3.3V and Rsense = 0.125ohm(Imax = 3.3V/(5*0.125ohm)*94%=4.9A), for 4-5ohm TEC, I would expect 2.5A current output. For the test part, I have tested 6 DRV8842, 2 of those output 0.45A at the beginning, then output 2.4A after several seconds. 3 of those output 2.4A directly. The last one stayed around 0.45A, which is nFault Status for a long time. So I was wondering if there is somethings that I missed about setting the right current limit or OCP. I am sure 0.45A is the output of nFault status and I don't know how to fix it for now. So any suggestions would be appreciated!
Thank you,
kevin