SBOS780C March 2016 – June 2021 THS3215
PRODUCTION DATA
The internal power for the THS3215 is a combination of its quiescent power and load power. The quiescent power is simply the total supply voltage times the supply current. This current is trimmed to reduce power dissipation variation and minimize variations in the ac performance. At a ±7.5 V supply, the maximum supply current of 36.5 mA dissipates 548 mW of quiescent power. The worst-case load power occurs if the output is at ½ the single-sided supply voltage driving a dc load. Placing a ±3.75 V dc output into 100 Ω adds another 37.5 mA × 3.75 V = 140 mW of internal power. This total of approximately 688 mW of internal dissipation requires the thermal pad be connected to a good heat-spreading ground plane to hold the internal junction temperatures below the rated maximum of 150°C.
The thermal impedance is approximately 45 °C/W with the thermal pad connected. For 688 mW of internal power dissipation there is a 31°C (approximate) rise in the junction temperature from ambient. Designing for the intended 85°C maximum ambient temperature results in a maximum junction temperature of 116°C.