JAW050A1 Datasheet, PDF (12/16 Pages) Lineage Power Corporation – JAW050A and JAW075A Power Modules; dc-dc Converters 36 Vdc to 75 Vdc Input, 5 Vdc Output; 50 W to 75 W

JAW050A and JAW075A Power Modules; dc-dc Converters:
36 Vdc to 75 Vdc Input, 5 Vdc Output; 50 W to 75 W
Data Sheet
April 2008
Thermal Considerations (continued)
Heat Transfer Without Heat Sinks (continued)
20
18
3.0 m/s
16
(600 ft./min.)
14
4.0 m/s
(800 ft./min.)
12
10 _{0.1 m/s}
8 ^{(20 ft./min.)}
6
1.0 m/s
(200 ft./min.)
4 _{2.0 m/s}
2 ^{(400 ft./min.)}
0
0 10 20 30 40 50 60 70 80 90 100
LOCAL AMBIENT TEMPERATURE, TA (°C)
8-2465(F)
Figure 21. Forced Convection Power Derating with
No Heat Sink; Longitudinal Orientation
20
18
3.0 m/s
16
(600 ft./min.)
14
4.0 m/s
(800 ft./min.)
12
10
0.1 m/s
8 _{(20 ft.min.)}
6 1.0 m/s
(200 ft./min.)
4
2.0 m/s
2 (400 ft./min.)
0
0 10 20 30 40 50 60 70 80 90 100
LOCAL AMBIENT TEMPERATURE, TA (°C)
8-2466(F)
Figure 22. Forced Convection Power Derating with
No Heat Sink; Transverse Orientation
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
module thermal resistance (θca) is defined as the max-
imum case temperature rise (ΔTC, max) divided by the
module power dissipation (PD):
θca = ^Δ----^T---P-^C---^,-_D-^m----^a--^x- = -⁽--T----^C--P--^–--_D---T----^A---⁾-
The location to measure case temperature (TC) is
shown in Figure 18. Case-to-ambient thermal resis-
tance vs. airflow for various heat sink configurations
and heights is shown in Figures 23 and 24. These
curves were obtained by experimental testing of heat
sinks, which are offered in the product catalog.
9
8
7
NO HEAT SINK
6
1/4 IN. HEAT SINK
1/2 IN. HEAT SINK
5
1 IN. HEAT SINK
1 1/2 IN. HEAT SINK
4
3
2
1
0
0
0.5
1.0
1.5
2.0
2.5 3.0
(100) (200) (300) (400) (500) (600)
AIR VELOCITY, m/s (ft./min.)
8-2164(F).a
Figure 23. Case-to-Ambient Thermal Resistance
Curves; Longitudinal Orientation
8
7
NO HEAT SINK
6
1/4 IN. HEAT SINK
1/2 IN. HEAT SINK
5
1 IN. HEAT SINK
1 1/2 IN. HEAT SINK
4
3
2
1
0
0
0.5
1.0
1.5
2.0
2.5 3.0
(100) (200) (300) (400) (500) (600)
AIR VELOCITY, m/s (ft./min.)
8-2165(F).a
Figure 24. Case-to-Ambient Thermal Resistance
Curves; Transverse Orientation
12
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