C2M0045170D -MOSFET failed due to over current

Vairavan

Dear Team,

We are using MOSFET : C2M0045170D in one of our application & facing MOSFET failure (GS & DS are short) and the details are mentioned below for your analysis and feedback.

Application: High Voltage Pulse Switching

Normal Operating condition:

1. Switching Voltage - 38.4kV (40 MOSFET's are connected in series)

2. Switching Current - 60A (Load ~648 Ohms, load inductance 20uH Max).

3. Pulse width - 1us.

4. Rise / Fall time - <150nsec

5. Switching type - High side switching.

6. MOSFET Part # - C2M0045170D

During normal operation it is working fine.

But in some condition, our system will enter into short-circuit(SC) mode.lets say,every 10mins(ie.,<1usec pulse per 10mins) of operation it will occur.At this condition, some of the MOSFETs were failed.

Observed values during SC condition are,

Vds-1200V (during MOSFET ON condition)

Id - 160A

SC pulse time=<1usec (only one pulse per 10mins)

It would be better if we get to know the reason for this MOSFET failure to solve this issue.

Please do the needful.

Regards,

Vairavan P

Senior Design Enginner,

Datapatterns Ltd,

Chennai,

India

TBhatia

Hello Vairavan,

Thank you for the question! The short-circuit time of C2M0045170D is 2-3us but since the application has periodic short-circuit events every 10mins, we would like to investigate this failure further.

Do you have a sales contact in your region? They can raise a request for an investigation on this issue with the team or I can request the sales team to contact you directly. Thank you!

Vairavan

Hi Bhatia,

Thanks for your reply!

Sure, You can contact me directly.

May i know, what are the information to resolve this issue?

And also i would like to inform you that, At a time 12-MOSFETs had been failed out of 40MOSFETs during short circuit condition.-FYI

Thanks in advance

Regards,

Vairavan P

TBhatia

Hi Vairavan,

The regional sales team will contact you for further investigating the failure. In the meantime, can you include some MOSFET voltage and current waveforms during normal operation and during the time of failure?

Thank you!

Vairavan

Hello Bhatia,

Please find the attachment.

Let me know, if you need clarifications further.

Thanks in advance.

Regards,

Vairavan P

Circuit.png

MOSFET current with notes.jpg

MOSFET current without notes.jpg

MOSFET Vgs and Vds with notes.jpg

MOSFET Vgs and Vds without notes.jpg

Vairavan

Hi Bhatia,

Have a good day!!

Have you seen that attached images??

Let me know, if you need any further clarification on this.

Regards,

Vairavan P

TBhatia

Hello Vairavan,

Yes I have seen the attached images. Thank you for attaching them!

The sales team will reach out to you if they haven't already done so and we can proceed from there.

Thank you!

TBhatia

Hi Vairavan,

I see that the sales team has already reached out to you and are working on this failure with you internally. Can we close this discussion?

Vairavan

Hello Bhatia,

Thanks for your support.

We shall close this discussion here.

Regards,

Vairavan P