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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

1 Introduction

The ZθJC graph includes a family of normalized thermal impedance curves at different values of duty cycle versus pulse width. Similar to the method shown in Understanding MOSFET Data Sheets, Part 6 – Thermal Impedance, the thermal resistance is measured on a standard 1.5 inches x 1.5 inches, FR4 PCB with the device mounted on a 1 inch2, 2 oz. Cu pad. However, instead of measuring thermal resistance with static power dissipation, the power pulse width and duty cycle are varied. The value of thermal resistance at each pulse width and duty cycle are then normalized to the static thermal resistance, RθJC, specified in the data sheet to generate the curves.