ULE Series
Isolated, High Density, Eighth-Brick
1.25–30 Amp, DC/DC Converters
For these reasons, MPS developed disposable heat shields using high tem-
perature plastic. The DC/DC is installed and reflowed with the shield in place.
After successful reflow and cooling, and before washing, the heat shield should
be removed.
5.35 (135.89)
1.50
1.50
(38.1)
(38.1)
Temperature Profiling
We wish to ramp the temperature up and down to successfully reflow the
solder without heat damage. Each reflow oven, humidity conditions, solder
paste type, oven feed rate, and the number of heat zones all require a different
profile. Therefore you may have to experiment.
PIN 1
DIMPLE
Since these converters are constructed using high temperature solders,
there will be no heat problems on your host pcb using traditional solder with
63% lead and 37% tin with a melting point of +183°C. Device lead tempera-
ture must remain below 230°C for less than 75 seconds, assuming that the
heat shield is in place. MPS uses a 216°C melt lead-free tin/silver/copper alloy
to assemble these converters.
2.875
(73.03)
12.40
(314.96)
2.875
(73.03)
There are several lead-free solders suitable for your host pcb depending on
your SMT system and whatever local certification and environmental regula-
tions you must observe. Contact MPS if you need specific advice.
Heat Shield
Careful thermocouple testing has shown that the interior of the DC/DC under
the heat shield is tens of degrees cooler than the outside ambient temperature
for typical reflow profiles. This protects internal components and limits the
amount of reflow where it is not desired. The heat shield also includes marking
for product identification and a date/lot code.
2.875
(73.03)
On ULE models, the heat shield is attached to the converter using molded
plastic pins on the heat shield interior which insert into recessed dimples in
the pinframe. An extra molded pin on the heat shield at the pin 1 location (and
corresponding notch on the pcb) can only be installed one way properly on the
pinframe. If the shield accidentally comes loose, it may be reinstalled by align-
ing the pins and dimples.
1.032
(26.21)
To remove the shield from the converter, after successful mounting and cool-
ing, squeeze the heat shield ears inward toward the converter body and pull the
shield upwards. Discard or recycle the shield. If you are using a flux wash cycle,
remove the heat shield before washing to avoid coming loose inside the washer.
DIMENSIONS ARE IN INCHES (MM)
Figure 13. Shipping Tray
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Murata Power Solutions, Inc.
France:
Germany:
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Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
www.murata-ps.com email: sales@murata-ps.com ISO 9001 and 14001 REGISTERED
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02/05/09
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without
China:
Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com
Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com
notice.
© 2008 Murata Power Solutions, Inc.
Singapore: Parkway Centre, Tel: +65 6348 9096, email: singapore@murata-ps.com
www.murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MDC_ULE Series.C11 Page 23 of 23