CAS480M12HM3 Short Circuit capability

MSW

Hi,

Can you please provide any data which characterize the short circuit withstanding capability of CAS480M12HM3, like pulsed current Vs duration curve. Or any data which describes how much short circuit energy that the module can contain within.

Thank you

Forum_Moderator

Thank you for your post, it has been approved and we will respond as soon as possible.

BlakeNelson

Hello MSW,

We have been developing a new safe operating area (SOA) plot that describes the relationship between maximum pulse current and time. Here is the plot for the CAS480M12HM3:

First, maximum power dissipation is calculated from the single pulse Zth data (see figure 17 in the datasheet), and then max current is calculated considering the relationship of resistance to current at 175 °C. At longer time steps, the max current equals the dc continuous drain current (481 A, as described on page 1 of the datasheet).

Because of the way SOA is calculated, the line defines the max current for a square pulse of duration tp, where the device is at full current for the entire duration. Obviously, short circuit events are more complex than a simple square pulse. A conservative interpretation of this plot is that the peak of your short circuit event should be kept below the line above. From a thermal perspective, it is more realistic to limit your RMS short circuit current to the line.

I hope that information is helpful! Let me know if you have any additional questions.

Blake Nelson

BlakeNelson

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