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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.
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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.