參數(shù)資料
型號(hào): JAW050A1
英文描述: Analog IC
中文描述: 模擬IC
文件頁(yè)數(shù): 12/16頁(yè)
文件大?。?/td> 359K
代理商: JAW050A1
12
Lucent Technologies Inc.
Advance Data Sheet
May 1999
dc-dc Converters; 36 Vdc to 75 Vdc Input, 5 Vdc Output; 50 W to 75 W
JAW050A and JAW075A Power Modules:
Thermal Considerations
(continued)
Heat Transfer with Heat Sinks
The power modules have through-threaded, M3 x 0.5
mounting holes, which enable heat sinks or cold plates
to attach to the module. The mounting torque must not
exceed 0.56 N-m (5 in.-lb.).
Thermal derating with heat sinks is expressed by using
the overall thermal resistance of the module. Total mod-
ule thermal resistance (
θ
ca) is defined as the maximum
case temperature rise (
T
C, max
) divided by the module
power dissipation (P
D
):
The location to measure case temperature (T
C
) is
shown in Figure 18. Case-to-ambient thermal resis-
tance vs. airflow is shown, for various heat sink config-
urations and heights, in Figures 23 and 24. These
curves were obtained by experimental testing of heat
sinks, which are offered in the product catalog.
8-2164(C).a
Figure 23. Case-to-Ambient Thermal Resistance
Curves; Longitudinal Orientation
8-2165(C).a
Figure 24. Case-to-Ambient Thermal Resistance
Curves; Transverse Orientation
These measured resistances are from heat transfer
from the sides and bottom of the module as well as the
top side with the attached heat sink; therefore, the
case-to-ambient thermal resistances shown are gener-
ally lower than the resistance of the heat sink by itself.
The module used to collect the data in Figures 23 and
24 had a thermal-conductive dry pad between the case
and the heat sink to minimize contact resistance. The
use of Figure 23 is shown in the following example.
Example
If an 82
°
C case temperature is desired, what is the
minimum airflow necessary Assume the JAW075A1
module is operating at V
I
= 55 V, an output current of
15 A, longitudinal orientation, maximum ambient air
temperature of 40
°
C, and the heat sink is 1/4 inch.
θ
ca
C max
P
D
,
----T
C
-T
T
A
(
)
P
D
=
=
0.5
(100)
1.0
(200)
1.5
(300)
2.0
(400)
2.5
(500)
0
1
AIR VELOCITY, m/s (ft./min.)
9
3.0
(600)
0
2
3
4
5
6
7
8
1 1/2 IN. HEAT SINK
NO HEAT SINK
C
R
C
°
C
1/4 IN. HEAT SINK
0.5
(100)
1.0
(200)
1.5
(300)
2.0
(400)
2.5
(500)
0
1
AIR VELOCITY, m/s (ft./min.)
8
3.0
(600)
0
2
3
4
5
6
7
1 1/2 IN. HEAT SINK
NO HEAT SINK
1/4 IN. HEAT SINK
1 IN. HEAT SINK
C
R
C
°
C
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