Hi,
We have used the TIDA-00281 design to run a 300W BLDC motor. The motor runs properly at very low speed but if we increase speed somewhat then it starts experiencing jerks. If we increase speed further then gate driver chip gets damaged on phase A. The pin2 (HB) and pin4 (HS) gets short with the ground. The high and low side mosfets on phase A also gets damaged, gate gets short with Drain and source. We have noticed this damage twice on phase A.
We cannot identify what's going wrong. We checked six step wave forms in the CRO and observed that when the complementary PWM given on high and low side of any phase ends, in the last cycle both the signals gets high. Please find attached wave forms for the open loop six step PWM given to gate driver chip. The makers 0 & 1 are phase A HI and LI, similarly 2 & 3 are for phase B HI and LI and 4 & 5 are phase C HI and LI. I have highlighted the waveform part in image tek00004 and tek00006.
Can you also confirm if the PWM we are giving are proper.