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OKI-T/3-W40 Series
Adjustable Output 3-Amp DOSA-SMT DC/DC Converters
Output Capacitive Load
These converters do not require external capacitance added to achieve
rated speci?cations. Users should only consider adding capacitance to reduce
switching noise and/or to handle spike current load steps. Install only enough
capacitance to achieve noise objectives. Excess external capacitance may
cause regulation problems, degraded transient response and possible oscilla-
tion or instability.
Output Voltage Adustment
The output voltage may be adjusted over a limited range by connecting an
Soldering Guidelines
Murata Power Solutions recommends the speci?cations below when installing these
converters. These speci?cations vary depending on the solder type. Exceeding these
speci?cations may cause damage to the product. Your production environment
may differ therefore please thoroughly review these guidelines with your process
engineers.
Reflow Solder Operations for surface-mount products (SMT)
For Sn/Ag/Cu based solders:
external trim resistor (Rtrim) between the Trim pin and Ground. The Rtrim resis-
tor must be a 1/10 Watt precision metal ?lm type, ±1% accuracy or better with
low temperature coef?cient, ±100 ppm/oC. or better. Mount the resistor close
to the converter with very short leads or use a surface mount trim resistor.
In the tables below, the calculated resistance is given. Do not exceed the
speci?ed limits of the output voltage or the converter’s maximum power rating
when applying these resistors. Also, avoid high noise at the Trim input. How-
ever, to prevent instability, you should never connect any capacitors to Trim.
Output Voltage
Calculated Rtrim (KΩ)
Preheat Temperature
Time over Liquidus
Maximum Peak Temperature
Cooling Rate
For Sn/Pb based solders:
Preheat Temperature
Time over Liquidus
Maximum Peak Temperature
Cooling Rate
Less than 1 oC. per second
45 to 75 seconds
260 oC.
Less than 3 oC. per second
Less than 1 oC. per second
60 to 75 seconds
235 oC.
Less than 3 oC. per second
5 V.
1.472
Recommended Lead-free Solder Re?ow Pro?le
3.3 V.
2.5 V.
2.0 V.
1.8 V.
3.122
5.009
7.417
9.024
250
200
Peak Temp.
235-260° C
1.5 V.
1.2 V.
13.047
22.464
150
100
Soaking Zone
120 sec max
Re?ow Zone
time above 217° C
45-75 sec
1.0 V.
0.7525 V.
41.424
∞ (open)
50
<1.5° C/sec
Preheating Zone
240 sec max
Resistor Trim Equation:
0
0
30
60
90
120
150
180
210
240
270
300
R TRIM ( ? ) = _____________ – 1000
10500
V OUT – 0.7525V
High trace = normal upper limit
Low trace - normal lower limit
Time (sec)
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mans?eld, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
This product is subject to the following operating requirements
and the Life and Safety Critical Application Sales Policy:
Refer to: http://www.murata-ps.com/requirements/
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. Speci?cations are subject to change without
notice. ? 2013 Murata Power Solutions, Inc.
www.murata-ps.com/support
MDC_OKI-T/3-W40 Series.A08 Page 13 of 13
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