ACPL-333J-000E 데이터 시트보기 (PDF) - Avago Technologies
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ACPL-333J-000E Datasheet PDF : 23 Pages
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Thermal Model
The ACPL-333J is designed to dissipate the majority of
the heat through pins 1, 4, 5 & 8 for the input IC and pins
9 & 12 for the output IC. (There are two VEE pins on the
output side, pins 9 and 12, for this purpose.) Heat flow
through other pins or through the package directly into
ambient are considered negligible and not modeled
here.
In order to achieve the power dissipation specified in
the absolute maximum specification, it is imperative
that pins 5, 9, and 12 have ground planes connected to
them. As long as the maximum power specification is
not exceeded, the only other limitation to the amount
of power one can dissipate is the absolute maximum
junction temperature specification of 125°C. The junction
temperatures can be calculated with the following
equations:
Tji = Pi (θi5 + θ5A) + TA
Tjo = Po (θo9,12 + θ9,12A) + TA
where Pi = power into input IC and Po = power into
output IC. Since θ5A and θ9,12A are dependent on PCB
layout and airflow, their exact number may not be
available. Therefore, a more accurate method of calcu-
lating the junction temperature is with the following
equations:
Tji = Pi θi5 + TP5
Tjo = Po θo9,12 + TP9,12
These equations, however, require that the pin 5 and pins
9, 12 temperatures be measured with a thermal couple
on the pin at the ACPL-333J package edge.
If the calculated junction temperatures for the thermal
model in Figure 42 is higher than 125°C, the pin tem-
perature for pins 9 and 12 should be measured (at the
package edge) under worst case operating environment
for a more accurate estimate of the junction tempera-
tures.
Tji
TI1 = 60°C/W
TP1
T1A = 50°C/W*
Tjo
Tji = junction temperature of input side IC
Tjo = junction temperature of output side IC
Tl9, 12 = 30°C/W TP5 = pin 5 temperature at package edge
TP9,12 = pin 9 and 12 temperature at package edge
θI5 = input side IC to pin 5 thermal resistance
TP9, 12
θo9,12 = output side IC to pin 9 and 12 thermal resistance
θ5A = pin 5 to ambient thermal resistance
T9, 12A = 50°C/W*
θ9,12A = pin 9 and 12 to ambient thermal resistance
*The θ5A and θ9,12A values shown here are for PCB layouts with reasonable air flow.
TA
This value may increase or decrease by a factor of 2 depending on PCB layout and/or airflow.
Figure 42. ACPL-333J Thermal Model
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Data subject to change. Copyright © 2005-2012 Avago Technologies. All rights reserved. Obsoletes AV02-0726EN
AV02-1087EN - October 25, 2012
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