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NXP Semiconductors
PCA9626
24-bit Fm+ I 2 C-bus 100 mA 40 V LED driver
10.1 Junction temperature calculation
A device junction temperature can be calculated when the ambient temperature or the
case temperature is known.
When the ambient temperature is known, the junction temperature is calculated using
Equation 4 and the ambient temperature, junction to ambient thermal resistance and
power dissipation.
T j = T amb + R th ? j - a ? ? P tot
where:
T j = junction temperature
T amb = ambient temperature
R th(j-a) = junction to ambient thermal resistance
P tot = (device) total power dissipation
When the case temperature is known, the junction temperature is calculated using
Equation 5 and the case temperature, junction to case thermal resistance and power
dissipation.
T j = T case + R th ? j - c ? ? P tot
(4)
(5)
where:
T j = junction temperature
T case = case temperature
R th(j-c) = junction to case thermal resistance
P tot = (device) total power dissipation
Here are two examples regarding how to calculate the junction temperature using junction
to case and junction to ambient thermal resistance. In the first example ( Section 10.1.1 ),
given the operating condition and the junction to ambient thermal resistance, the junction
temperature of PCA9626B, in the LQFP48 package, is calculated for a system operating
condition in 50 ? C 1 ambient temperature. In the second example ( Section 10.1.2 ), based
on a specific customer application requirement where only the case temperature is
known, applying the junction to case thermal resistance equation, the junction
temperature of the PCA9626B, in the LQFP48 package, is calculated.
1.
50 ? C is a typical temperature inside an enclosed system. The designers should feel free, as needed, to perform their own
calculation using the examples.
PCA9626
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 6 September 2012
? NXP B.V. 2012. All rights reserved.
31 of 47
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