UCC3895: 电源管理论坛

my customer now have the below question.

the circuit would breakdown IGBT occasionally. and the breakdown occurred at CE of Q5, Q6, Q7 and Q8. or when the peak voltage of IGBT driver pull down below 10V, the IGBT soft-breakdown.  

could you help re view the schematic? and help find the reason of breakdown phenomenon.

here is the schematic. 

here is the related waveform.

OUTAAA与OUTBBB

OUTCCC与OUTBBB

below is the waveform under capacitor charging.

blue is the capacitor voltage; yellow is the capacitor current. 

Holly Hong：

hi 

the test result have no problem, because customer cannot catch the problem waveform

,

Johnsin Tao：

Hi

    UCC3895设计比较复杂，建议你直接将这个问题放到美国E2E:  https://e2e.ti.com/

    我们也只有一些文档说明，并无EVM等调试测试工具，所以建议直接到美国E2E上提问。