Datasheet

( ) ( )
= - ´
TH TOT
A max J max
T T R P
= + ´
J A TH TOT
T T R P
TOT COND SW GD Q
P P P P P 0.958 W 0.118 W 0.014 W 0.0018 W 1.092 W= + + + = + + + =
TPS54560
www.ti.com SLVSBN0A –MARCH 2013–REVISED MARCH 2014
(54)
For given T
A
,
(55)
For given T
JMAX
= 150°C
where
• Ptot is the total device power dissipation (W)
• T
A
is the ambient temperature (°C).
• T
J
is the junction temperature (°C).
• R
TH
is the thermal resistance of the package ( ° C/W)
• T
JMAX
is maximum junction temperature (° C)
• T
AMAX
is maximum ambient temperature (°C). (56)
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.
Copyright © 2013–2014, Texas Instruments Incorporated Submit Documentation Feedback 31
Product Folder Links: TPS54560