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  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Review the ZθJC Graph
  6. 3Using the ZθJC Graph to Estimate Junction Temperature Rise
  7. 4Application Example
  8. 5Using the ZθJC Graph to Estimate MOSFET Peak Current Capability
  9. 6Application Example
  10. 7Summary
  11. 8References

Abstract

Power MOSFET data sheets include a normalized transient thermal impedance graph: junction-to-case, ZθJC, or junction-to-ambient, ZθJA. For simplicity, this article uses the terminology “ZθJC graph” for either with the understanding that the same principles can be applied to the ZθJA graph. These graphs are used to estimate the junction temperature rise due to single or repetitive power pulses. Alternatively, the ZθJC graph can also be used to estimate the MOSFET peak current capability for single or periodic pulses of current as shown in Understanding MOSFET Data Sheets, Part 4 - Pulsed Current Ratings, technical article.