Trim Connections
RTRIM
RLOAD
Trim
+V
OUT
Ground
R
TRIM (kΩ) =
1.182
V
OUT − 0.591
Output Voltage Adustment
The output voltage may be adjusted over a limited range by connecting an
external trim resistor (Rtrim) between the Trim pin and Ground. The Rtrim
resistor must be a 1/10 Watt precision metal fi lm type, ±0.5% accuracy or
better with low temperature coeffi 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
specifi 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. However, to prevent instability, you should never connect any capaci-
tors to Trim.
OKR-T/1.5-W12-C
Output Voltage Calculated Rtrim (Ω)
6 V. 218.5
5 V. 268
3.3 V. 436
2.5 V. 619
1.8 V. 978
1.5 V. 1300
1.2 V. 1940
1.0 V. 2890
0.591 V. ∞ (open)
RTRIM (k) =
_____________
(VOUT – 0.591)
1.182
Resistor Trim Equation, OKR-T/1.5-W12-C models:
Soldering Guidelines
Murata Power Solutions recommends the specifi cations below when installing these converters. These specifi cations vary depending on the solder type. Exceeding these specifi ca-
tions may cause damage to the product. Your production environment may differ; therefore please thoroughly review these guidelines with your process engineers.
Wave Solder Operations for through-hole mounted products (THMT)
For Sn/Ag/Cu based solders: For Sn/Pb based solders:
Maximum Preheat Temperature 115° C. Maximum Preheat Temperature 105° C.
Maximum Pot Temperature 270° C. Maximum Pot Temperature 250° C.
Maximum Solder Dwell Time 7 seconds Maximum Solder Dwell Time 6 seconds
OKR-T/1.5-W12-C
Adjustable Output 1.5-Amp SIP-mount DC/DC Converters
MDC_OKR-T/1.5-W12-C.A03 Page 16 of 16
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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. Specifi cations are subject to change without
notice. © 2014 Murata Power Solutions, Inc.
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfi 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/
