SpeedFit™ Design Simulator
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Start a SimulationCAB011M12FM3 Junction Heat Capacitance
Comments
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Thank you for your post, it has been approved and we will respond as soon as possible.
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Hi uyoas,
Using the information you've provided, we can expect either of the two conditions:
1 Joule over 1 us: 1 MW with a ZTH of 0.0019 C/W -> expected Tj of ~1900C
1 Joule over 2 us: 0.5 MW with a ZTH of 0.0024 C/W -> expected Tj of ~1200C
The ZTH values I've provided here are from the single pulse curve from the CAB011M12FM3 datasheet:
Obviously, both of these expected junction temperatures are far beyond the recommended 175C limit of the die, and there is always a chance of failure in this condition. As of this time we cannot provide a guarantee that the die will survive your specified conditions. However, I can provide two things that may be helpful. First, we have measured the short circuit withstand time of CAB016M12FM3 power modules, the results of which are shown below. For this part, the modules were able to survive between 2.5 - 4 us at an 800 V bus. Again, this does not mean that the module will survive this condition, but it is not guaranteed to fail, either. If the robustness of this condition is required for your system, we recommend performing testing on the modules to ensure that it will survive at a rate adequate for your application. If you do, please remember that some failures may not be catastrophic; the stress on the die may cause changes in the device behavior, even it appears functional. Second, we highly recommend implementing DESAT protection on your module to protect against the short circuit event. It is possible to reduce the short circuit time to <500 ns with a properly implemented DESAT protection. This will greatly reduce the chance of failure during a short circuit event. Please let me know if you need any more information on implementing DESAT protection.
Thanks,
Brian
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Hi uyoas,
I hope that this answered your question.
I will close this discussion for now but if you have a follow up question, please "Start a New Discussion" and we would be glad to support you further.
Blake
