Use the equation below to estimate the junction temperature (T_J) of the UCC5390-Q1 family.

Equation 12.

where

• T_C is the UCC5390-Q1 case-top temperature measured with a thermocouple or some other instrument.
• Ψ_JT is the junction-to-top characterization parameter from the Thermal Information table.

Using the junction-to-top characterization parameter (Ψ_JT) instead of the junction-to-case thermal resistance (R_θJC) can greatly improve the accuracy of the junction temperature estimation. The majority of the thermal energy of most ICs is released into the PCB through the package leads, whereas only a small percentage of the total energy is released through the top of the case (where thermocouple measurements are usually conducted). The R_θJC resistance can only be used effectively when most of the thermal energy is released through the case, such as with metal packages or when a heat sink is applied to an IC package. In all other cases, use of R_θJC will inaccurately estimate the true junction temperature. The Ψ_JT parameter is experimentally derived by assuming that the dominant energy leaving through the top of the IC will be similar in both the testing environment and the application environment. As long as the recommended layout guidelines are observed, junction temperature estimations can be made accurately to within a few degrees Celsius.