10.3 Thermal Consideration

The TPS82084/5's output current needs to be derated when the device operates in a high ambient temperature or deliver high output power. The amount of current derated is dependent upon the input voltage, output power, PCB layout design and environmental thermal condition.

The TPS82084/5 module temperature must be kept less than the maximum rating of 125°C. Three basic approaches for enhancing thermal performance are listed below:

• Improve the power dissipation capability of the PCB design.
• Improve the thermal coupling of the component to the PCB.
• Introduce airflow into the system.

To estimate approximate module temperature of TPS82084/5, apply the typical efficiency stated in this datasheet to the desired application condition for the module power dissipation, then calculate the module temperature rise by multiplying the power dissipation by its thermal resistance. For more details on how to use the thermal parameters in real applications, see the application notes: SZZA017 and SPRA953.