LM26420, LM26420-Q0, LM26420-Q1
SNVS579J –FEBRUARY 2009–REVISED SEPTEMBER 2015
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Thermal Considerations (continued)
From the previous example:
PINTERNAL = 304 mW
(41)
(42)
165oC - 152oC
= 42.8o C/W
=
RTJAꢀ
304 mW
If the junction temperature was to be kept below 125°C, then the ambient temperature could not go above
112°C.
TJ - (RθJA × PINTERNAL) = TA
(43)
(44)
125°C – (42.8°C/W × 304 mW) = 112.0°C
34
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