SLVSEE8B November 2019 – May 2021 DRV8899-Q1
For an ambient temperature of TA and total power dissipation (PTOT), the junction temperature (TJ) is calculated as shown in the following equation. TJ = TA + (PTOT x RθJA)
Considering a JEDEC standard 4-layer PCB, the junction-to-ambient thermal resistance (RθJA) is 40.7 °C/W for the VQFN package.
The junction temperature is calculated as shown below -