Hi,
for the DRV8432 regarding the cycle-by-cycle mode. is there a TI application note regarding this topic? The idea of 1% pwm on the "off" channel is not mentioned in data sheet is it? I put this 1% pwm in my code and now have the following questions for you. i attach some pics of my dvm and scope.
pic1 shows my normal setup. pwmA running at 97% freq 25kHz. pwmb running at 1% freq 25kHz. no load here.
pic2 pic3: shows output pwms before power inductors. i have a 3.5ohm resistor loading so load current should be around 7.0amps which i get very nicely from the dual full bridge using the oc adjust resistor of 27kohm (9.7amp). but now i change to 82kohm for 3.4amp limit but i do not see this ti output toggling around the 3.4amp limit. but rather my dvm measures only some 0.243amps. why? and what is this new crazy pwmb signal i am seeing with the double pulse? the first pulse is my 1% but what is the second pulse? is this proof positive that i am successfully in the cycle-by-cycle current limiting mode? yippee.
-Steve