• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 63 subscribers
  • Views 918 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

CSD19536KTT: CSD19536KTT / SOA curve is changed depend on ambient temperature?

S.Satoshi
Guru 21685 points
Part Number: CSD19536KTT

Hi,

Please let me understand about SOA curve of FETs.

  1. Is the SOA curve in datasheet applied for Ta=25degC?
  2. Is SOA curve changed depend on ambient temperature? In other words can we not use this curve for higher Ta condition?

Best Regards,

Satoshi / Japan Disty

  • 0
    TI__Expert 7905 points
    Satoshi san,

    Yes the SOA is based on 25degC and yes it will degrade with an increase in temperature.
    The best way to determine the the decrease in SOA is to ratio it from Tj max using equation:- SOA ratio/reduction factor = (Tjmax-Ta)/(Tjmax-25degC). Then multiply this by the SOA to get a new SOA number.
    As an example , if Tj max of FET is 175degC and ambient 100degC, the SOA ratio/reduction factor = (175-100)/(175-25) = 75/150 = 0.5. So in this case the SOA capability would be halved.

    There is some more information about SOA in this blog here, if you are interested: e2e.ti.com/.../understanding-mosfet-data-sheets-part-2-safe-operating-area-soa-graph

    Chris