SBOSAA5B April 2022 – September 2022 OPA2675
As a result of the high output power capability of the OPA2675, heat-sinking or forced airflow may be required under extreme operating conditions. The maximum desired junction temperature sets the maximum allowed internal power dissipation, and is described in the following paragraph. The maximum junction temperature allowed should not exceed +150°C.
Operating junction temperature (TJ) is given by
Equation 14 is the power dissipated at the output stage of OPA2675 that determines the internal power dissipation.
As a worst-case example, compute the maximum TJ using an OPA2675 VQFN-16 in the circuit of Figure 8-1 operating at the maximum specified ambient temperature of +85°C with both outputs driving a grounded 20 Ω load to +2.5 V.
The output V-I plot in Output Current and Voltage includes a boundary for 2-W maximum internal power dissipation under these conditions.