HEN-1.5/25-D12M-C Murata Power Solutions Inc, HEN-1.5/25-D12M-C Datasheet - Page 8

• Manufacturer Part Number: HEN-1.5/25-D12M-C
• Description: DC/DC Converters & Regulators 37.5W 12V-1.5V 25A Eighth-Brick
• Manufacturer: Murata Power Solutions Inc
• Series: HENr

Specifications of HEN-1.5/25-D12M-C

• Output Power: 38 W
• Input Voltage Range: 10.2 V to 13.8 V
• Number Of Outputs: 1
• Output Voltage (channel 1): 1.5 V
• Output Current (channel 1): 25 A
• Package / Case Size: Eighth Brick
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: HEN-1.5/25-D12M-C

Heatsink Installation
Heatsinks, in combination with adequate airflow, significantly extend the
power-handling capability of DATEL power supplies and add a safety
margin. Please study the Derating Curves to understand the increased
thermal capacity available when a heatsink is installed.
DATEL will supply our custom-designed heatsinks already installed. If
preferred, users may also purchase the heatsink assembly separately. If so,
please carefully follow the installation instructions below to avoid damage
to the DC/DC converter. Contact DATEL if you need assistance. The follow-
ing procedures require adequate mechanical skills.
Installation has several goals:
1. Insure positive thermal contact between heat-generating circuit
2. Avoid mechanical stress to the printed circuit board and on-board
3. Fasten the heatsink securely so that vibration in the application will not
4. Avoid stripping threads in the aluminum heatsink.
Thermal Pads
The heatsink is supplied with one or more thermal mounting pads which
provide a heat transfer path with low thermal resistance between power
components and the heatsink. DATEL does NOT recommend "thermal
grease" or thermal mounting compounds.
Mounting Screws
DATEL power supplies are precision miniature electronic assemblies
fabricated on multiple circuit board layers. Excessive pressure or incor-
rect mechanical stress may distort the board layers, apply too much force
on components or even break small connections. Such fractures may not
be visible with the naked eye. It is very important to use the assembly
sequence below. We want both a correct sequence and the right amount
of torque. This assembly sequence is similar to engine cylinder heads
(progressive torquing of diagonally alternating bolts).
A tiny amount of medium-strength (blue) Loctite ® thread assembly adhe-
sive or equivalent is acceptable in high vibration applications. The threads
must be degreased for Loctite to work. Do not soak the threads with
Loctite. Also, be aware that Loctite will soften at higher temperatures.
components and the heatsink.
components.
loosen the mounting screws. Note that some heat may be conducted
through the screws.
www.murata-ps.com
Correct assembly requires a precision low range torque wrench.
[1] Make sure all the thermal pads have been securely installed. Mount the
[2] Tighten the first screw only to 50% of maximum final torque (see the
[3] Tighten the screw in the diagonally opposite corner to 50% torque.
[4] Tighten the screw adjacent to the first screw to 50% torque.
[5] Repeat steps [2] to [4], tightening all screws to their maximum torque.
[6] Thoroughly retest the power supply before committing it to application.
WARNING: Incorrect assembly sequence and/or excessive torque may
damage the converter.
For attachment screws, the following maximum final torques must be used:
heatsink using the screws supplied. See the assembly diagram. Do not
tighten the screws yet.
table below).
Single Output, Non Isolated, 12VIN, 0.8-5VOUT
#2-56 thread
#4-40 thread
#6-32 thread
Screw Size
#M3 thread
Technical enquiries email: [e-mail], tel:
25 Amp, High di/dt DC/DC Converters
Maximum Assembled Torque
2.5 inch-pounds maximum
5.5 inch-pounds maximum
6.0 inch-pounds maximum
9.6 inch-pounds maximum
HEN D12 Models
MDC_HEN-D12.B01 Page 8 of 11
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