JAJSGV6 January 2019 TPS54560B
PRODUCTION DATA.
The following formulas show how to estimate the TPS54560B power dissipation under CCM operation. Do not use these equations if the device is operating in DCM.
The power dissipation of the IC includes conduction loss (PCOND), switching loss (PSW), gate-drive loss (PGD), and supply current (PQ). Example calculations are shown with the 12-V typical input voltage of the design example.
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where
Therefore,
For given TA,
For given TJMAX = 150°C
where
There will be additional power losses in the regulator circuit due to the inductor ac and dc losses, the catch diode and PCB trace resistance impacting the overall efficiency of the regulator.