MHSL10025 Lineage Power, MHSL10025 Datasheet - Page 6

• Manufacturer Part Number: MHSL10025
• Description: HEATSINK 2.28L X.84"H EXTRUSION
• Manufacturer: Lineage Power

Specifications of MHSL10025

• Attachment Method: Bolt On
• Outline: 57.91mm x 36.83mm
• Height: 0.84" (21.33mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Package Cooled: -
• Power Dissipation @ Temperature Rise: -
• Thermal Resistance @ Forced Air Flow: -
• Thermal Resistance @ Natural: -

Thermal Management for FC- and FW-Series
250 W—300 W Board-Mounted Power Modules
Module Derating
Natural Convection With Heat Sinks
Figures 8 and 9 show the power derating for a module
in natural convection with the heat sinks shown in Fig-
ures 6 and 7. Natural convection is the heat transfer
produced when air in contact with a hot surface is
heated, causing it to rise. An open environment is
required with no external forces moving the air. Figures
8 and 9 apply when the module is the only source of
heat present in the system, generating airflow of
approximately 10 ft./min. to 20 ft./min. Again, a typical
system with other heat dissipating components will
usually generate higher airflows in natural convection.
6 6
Figure 8. Heat Sink Power Derating Curves
70
60
50
40
30
20
10
0
0
10
LOCAL AMBIENT TEMPERATURE, T
Natural Convection, Longitudinal Ori-
entation
20
30
(continued)
40
50
1 1/2 in.
1 in.
1/2 in.
1/4 in.
NONE
60
70
A
80
( C)
90
8-1318
100
Figures 8 and 9 can be used to predict which heat sink
a module will require in a natural convection environ-
ment, as shown in the following example.
Example 3: Sizing a Heat Sink
What heat sink would be appropriate for a transverse
mounted FW300A1 in a natural convection environ-
ment at 54 V input and 2/3 load with a maximum ambi-
ent temperature of 35 °C?
Solution:
Given: V
Determine P
Determine Heat Sink (Figure 9):
Figure 9. Heat Sink Power Derating Curves
70
60
50
40
30
20
10
0
1 1/2 in. heat sink allows up to T
0
I
= 54 V, Io = 2/3(60) = 40 A, T
10
LOCAL AMBIENT TEMPERATURE, T
Natural Convection, Transverse Ori-
entation
D
20
(Figure 2): P
30
40
D
50
= 35 W
Tyco Electronics Corp.
1 1/2 in.
1 in.
1/2 in.
1/4 in.
NONE
60
Technical Note
A
70
A
= 35 °C
= 35 °C
July 1996
A
80
( C)
90
8-1319
100