Hello
Thank you for your support.
My customer have original design using TPS54335A as page 3~page4 on attached ppt.
They are investigating the root cause about several returns from market. (all of those PH pin had shorted to GND).
They will have new project using TPS54335A ( bigger biz size) but condidering .
So, customer simulate actual environment for in-house test ( page2) now.
They found that when electro-magnetic contactor trips , sometimes ( 1time/40times) violate ABS max rating of PH pin in the period of dead time. ( page 6).
Inquiry ( Would you please have your comment)
1 Do you think PH undershoot on Fig 2( page 6 ) leads the failure for TPS54335A ?
2 I had recommendedcustomeri to add shottky diode ( low Vf) in order to keep PH undershoot < 1V.
Do you agree?
If no, do you have any recommend ? ( I had already asked i to improve
PCB layout as page 4.) As per Webench sim, stability seems no problem ( page3)
Best Regards
Thank you
