Tool/software: WEBENCH® Design Tools
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Tool/software: WEBENCH® Design Tools
Hi Richard,
The safe operating area for TPS799 will depend on which package you use as each package yields different thermal metrics.
You can estimate the SOA by using the power dissipated (Pd = (Vin - Vout) x Iout) and the data provided in the Thermal Information table. Since layout affects the thermal performance of the LDO, it is common to initially use the thetaJA information for early calculations. Tj max for TPS799 is 125C per the Recommended Operating Conditions Table. Therefore we can graph the SOA using the following equation:
Tj = Ta + thetaJA x Pd
You are correct that there should not be a difference between the SOA for the fixed device verses the adjustable device given the same ambient temperature, package, and power dissipation.
Very Respectfully,
Ryan