Sir,
I am using DRV8412 in my PCB for dual TEC control and using Mode 1 for cycle-by cycle limit.
Currently I am trying to drive a 12V-2.5A TEC through Output C & D and left open outputs A&B. Used 100K for R-OC adj resistor and same value of output inductor and capacitor as give in the reference TEC circuit of datasheet.
I am giving PWM input to input C and zero volts to D. But not getting any output even by increasing PWM upto 400kHz and
changing duty cycle(giving minimum off time of 50ns for boot strap capacitors). No output even for giving complimentary PWMs (Measuring the current through a current probe of 100khz bandwidth). No outputs even when TEC is not connected.
Fault pin is not asserting low. Is the capacitors after inductor is trying to draw heavy inrush currents and hitting the cycle by cycle limit?
What should be the PWM configurations for inputs, both inputs with complimentary PWMS or one with PWM and other with 0v?
what is the fault in the scheme?
thanks
Sanoj Kumar