Other Parts Discussed in Thread: LMG2100EVM-078, TIDA-010936, TIDA-010933
Tool/software:
Hi TI Experts,
I am currently testing my pcb using LMG2100 for buck-boost converter. I face a big issue that damage the LMG2100, I had damage 5 ICs already. Especially when I apply the PWM in HI and LI side from microcontroller. I have tried using the LMG2100EVM-078 board, it worked without buffer to assert PWM from microcontroller. The PWM just runs in 12.5kHZ. When I check the TIDA-010936 TI use Buffer TXU0304DTR from PWM output to HI/LI.
I noted that in evaluation board LMG2100EVM-078, TIDA-010936, and TIDA-010933, you have pull down resistor of 10kohm in HI and LI side (R13 and R15 in figure below from TIDA-010933 ref design) , but I check in the datasheet there is none mentioning this. Is this required? currently I don't put this pull up resistor, I only put resistor and cap as in R12 and C18 as lowpass filter.
Can you explain why this happening?
Note: The Vin is 24 volt. AGND connect to GND of microcontroller, PGND is forced connected to AGND with 0 ohm resistor as in the design of LMG2100EVM-078 (below). I don't use dead time circuit since the PWM from my microcontroller has the deadtime. Sometimes it works, currently I take out the inductor to see the SW output. 
