MHSL02540 Lineage Power, MHSL02540 Datasheet - Page 2

• Manufacturer Part Number: MHSL02540
• Description: HEATSINK 2.39L X.235"H EXTRUSION
• Manufacturer: Lineage Power

Specifications of MHSL02540

• Attachment Method: Bolt On
• Outline: 60.70mm x 57.90mm
• Height: 0.235" (5.97mm)
• 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
Basic Thermal Management
The goal of thermal management is to transfer the heat
dissipated by the module to the surrounding environ-
ment. The amount of power dissipated by the module
as heat (P
(P
tion below:
P
Also, module efficiency ( ) is defined as the ratio of
output power to input power as shown by the equation
below:
The input power term can be eliminated by the combi-
nation of these two equations to yield the equation
below:
P
This equation can be used to calculate the module
power dissipation. However, efficiency is a nonlinear
function of the module input voltage (V
current (Io). Typically, a plot of power dissipation versus
output current over three different line voltages is given
in each module-specific data sheet. This is because
each module has a different power dissipation curve. A
typical curve of this type is shown below in Figure 2 for
a FW300A1 Power Module (5 V output voltage).
2 2
D
D
Figure 2. FW300A1 Power Dissipation vs. Output
= Po / P
I
) and the output power (Po) as shown by the equa-
= P
= Po (1 – ) /
70
60
50
40
30
20
10
0
I
0
– Po
I
D
) is the difference between the input power
Current
10
V = 72 V
V = 54 V
V = 36 V
OUTPUT CURRENT, I
20
30
40
O
I
) and output
(continued)
(A)
50
8-1313
60
Module Derating
Experimental Setup
The derating curves in the following figures were
obtained from measurements obtained in an experi-
mental apparatus shown in Figure 3. Note that the
module and the printed-wiring board (PWB) onto which
it was mounted were vertically oriented. The passage
has a rectangular cross-section. The clearance
between the top of the module and the facing PWB was
kept constant at 0.5 in.
TEMPERATURE
AIR VELOCITY
Figure 3. Experimental Test Setup
AND AMBIENT
MEASURED
FACING
HERE
PWB
AIRFLOW
Tyco Electronics Corp.
Technical Note
PWB
July 1996
8-690a