SLVSD01B September 2015 – May 2019 TPS57140-EP
PRODUCTION DATA.
The following formulas show how to estimate the IC power dissipation under CCM operation. Do not use these equations used if the device is working in DCM.
The power dissipation of the IC includes conduction loss (Pcon), switching loss (Psw), gate-drive loss (Pgd), and supply current (Pq).
where
So,
For a given TA,
For a given TJMAX = 150°C
where
There are additional power losses in the regulator circuit, due to the inductor ac and dc losses, the catch diode, and trace resistance, that impact the overall efficiency of the regulator.