TPS54260-EP Datasheet, PDF (37/50 Pages) Texas Instruments – 3.5-V to 60-V Step-Down Converter With Eco-mode Control Scheme

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TPS54260-EP
SLVSDN9 – DECEMBER 2016
For given T_A,
T_J = T_A + Rth × Ptot
(54)
For given T_JMAX = 150°C
T_Amax = T_Jmax – Rth × Ptot
where
• Ptot is the total device power dissipation (W)
• T_A is the ambient temperature (°C)
• T_J is the junction temperature (°C)
• Rth is the junction-to-ambient thermal resistance of the IC on the PCB layout (°C/W)
• T_JMAX is maximum junction temperature (°C)
• T_AMAX is maximum ambient temperature (°C)
(55)
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.
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