MHSL10025 Lineage Power, MHSL10025 Datasheet - Page 8

• 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
Basic Thermal Model
Figures 11 and 12 can be used to determine thermal
performance under various airflow and heat sink con-
figurations as shown in the following examples.
Example 4: Airflow Required to Maintain Tc
Although the maximum case temperature for the FC-
and FW-Series 250 W—300 W BMPMs is 100 °C, one
may want to limit the maximum case temperature to a
lower value for extremely high reliability. If an 85 °C
case temperature is desired, what are the allowable
minimum airflow/heat sink combinations necessary for
a transverse mounted FW300A1 operating at 54 V
input line and an output current of 50 A with a maxi-
mum ambient of 40 °C?
Solution:
Use Figure 12 to determine air velocity:
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No rights under any patent accompany the sale of any such product(s) or information.
© 2001 Tyco Electronics Corporation, Harrisburg, PA. All International Rights Reserved.
Printed in U.S.A.
July 1996
TN96-009EPS
Given: V
Determine P
No heat sink:
1/4 in. heat sink:
1/2 in. heat sink:
1 in. heat sink:
1 1/2 in. heat sink:
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= (Tc – T
= (85 – 40) / 46
= 1.0 °C/W
I
= 54 V, Io = 50 A, T
A
) / P
D
(Figure 2): P
D
v >> 600 ft./min.
v >> 600 ft./min.
v = 450 ft./min.
v = 260 ft./min.
v = 205 ft./min.
D
(continued)
A
= 46 W
= 40 °C
Example 5: Determining Tc
Suppose that there is an air velocity of 600 ft./min.
available for the configuration stated in Example 4.
What is the case temperature for the various heat sink
configurations?
Solution:
In this configuration, the module would not operate
within the maximum case temperature of 100 °C unless
a heat sink was attached.
Thermal Shutdown
The FC- and FW-Series 250 W—300 W BMPMs has a
latching thermal shutdown circuit designed to turn off
the module if it is operated in excess of the maximum
case temperature. Recovery from thermal shutdown is
accomplished by cycling the dc input power off for at
least 1.0 s, or toggling the primary referenced ON/OFF
signal for at least 1.0 s.
Given: V
Determine P
Using thermal resistances ( ) from Figure 12:
No heat sink: = 1.5 °C/W
1/4 in. heat sink: = 1.2 °C/W
1/2 in. heat sink: = 0.9 °C/W
1 in. heat sink: = 0.6 °C/W
1 1/2 in. heat sink: = 0.5 °C/W
I
= 54 V, Io = 50 A, T
D
(Figure 2): P
Tc = ( x P
Tc = (1.5 x 46) + 40 = 109 °C
Tc = (1.2 x 46) + 40 = 95 °C
Tc = (0.9 x 46) + 40 = 81 °C
Tc = (0.6 x 46) + 40 = 68 °C
Tc = (0.5 x 46) + 40 = 63 °C
D
A
= 46 W
D
= 40 °C, v = 600 ft./min.
) + T
Technical Note
A
July 1996
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