Power Dissipation Calculation for TLF35584Qx

A thermal simulation based on a large signal transient switching model to predict power loss
and junction temperature at user defined electrical conditions

  • Define electrical parameters and select parts
  • Click on „Steady-State“ to view Simulation results
  • Want more variations? Change circuit configuration
  • Click on 'Hold result' to keep trace & compare to other Simulation results

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This simulation model is executed on all internal regulators simultaneously: the pre-regulators with step-up switching converter "Boost” and step-down switching converter "Buck" as well as the "LDOs" as post-regulators. Please refer to the data sheet for details on these circuits. Please note that the "Buck" converter and the "LDOs" are powered by the output of the "Boost" if the “system input voltage” is less than 7.5V, or directly by the “system input voltage” if it is greater than 7.5V or the “Boost” is manually disabled. This manually activate or deactivate ”Boost”-function makes it possible to simulate the PMIC’s power dissipation without "Boost". The load current imposed on "Boost" and "Buck" as well as their output voltages are shown in the "Converter Outputs" display. In addition, the current ripple of the output capacitors of "Buck" and "Boost" is displayed in the "Capacitor Currents" plot in order to select external components. The losses of all internal regulators of “TLF35584” are added and dissipated to the environment via "Rth_ja". Therefore, the loss contribution of any stage increases the junction temperature accordingly. For the "Boost" converter, an external diode and transistor must be used. Here it is possible to choose between some diodes and transistors which datasheets can be found using the links below. This template does not model the "pulse frequency modulation feature“ of “Buck”.