1A Ultra Low Dropout Linear Regulator
TJ4940
The maximum allowable power dissipation is also influenced by the ambient temperature. With the
above
θ
JA
-Copper plane area relationship, the maximum allowable power dissipation could be evaluated
with respect to the ambient temperature. As shown in graph, the higher copper plane area leads
θ
JA
.
And the higher ambient temperature leads lower maximum allowable power dissipation.
All this relationship is based on the aforesaid equation ;
θ
JA
= T
Rmax
/ P
D
= (T
Jmax
– T
Amax
) / P
D
.
T.B.D
Jul. 2011 – Preliminary
8/8
HTC