ZHCSEK0C November 2015 – October 2024 THS4541-Q1
PRODUCTION DATA
The relatively low internal quiescent power dissipation for the THS4541-Q1, combined with the excellent thermal impedance of the 16-pin VQFN (RGT) package, limits the possibility of excessively-high, internal-junction temperatures.
To estimate the internal junction temperature (TJ), an estimate of the maximum internal power dissipation (PD) is first required. There are two pieces to the internal power dissipation: quiescent current power and the power used in the output stage to deliver load current. To simplify the latter, the worst-case, output-stage power is driving a dc differential voltage across a load using half the total supply voltage. As an example:
Even for this extreme condition and the maximum rated ambient temperature of 125°C, the junction temperature is a maximum 132°C (less than the rated absolute maximum of 150°C). Follow this same calculation sequence for the exact application and package selected to predict the maximum TJ.