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DMS-EB-DC/DC
DC/DC Converter and Isolation Board for
DMS-30PC/LCD Meters
MPM_DMS-EB-DCDC.C01 Page 1 of 2
Description: The DMS-EB-DC/DC Application Board provides isolated +5V power for
Murata Power Solutions’ DMS-30PC/LCD Series, 3½ Digit, LED/LCD Display, Digital Panel
Voltmeters. This add-on board is ideal for applications requiring isolation (up to 750V)
between the input signal and the meter's +5V supply.
Features: The DMS-EB-DC/DC is an excellent choice for dc ammeter applications.
These ammeters typically have the current shunt located on the positive side of the power
supply — a condition which usually exceeds the meter's common mode voltage limit.
Input-to-output isolation is required if the power source being measured also powers the
DMS-30. See dc ammeters application note DMS-AN6 at
http://www.murata-ps.com/data/meters/dms-an6.pdf.
Applications: The DMS-EB-DC/DC incorporates all standard features of the DMS-EB
board; the only exception being the smaller allowable range of power supply voltage when
using the LM7805 3-terminal regulator. Use the DMS-EB-DC/DC with any DMS-30PC meter
or DMS-30LCD meter (5V-powered models only).
+7.5-18V Operation (Optional): Open SG4 and install U2 (LM7805CT) with its metal
tab adjacent to U1. Applications requiring a lower dropout voltage should consider the
LM2931T-5. Exceeding the
allowable regulator input voltage
ranges (see Functional Specifi ca-
tions) will cause device over-
heating! As is the case when
specifying any electronic power
component, be sure to consult all
applicable manufacturer's data
sheets.
FEATURES
■ Provide isolated +5V power for DMS-30 Series meters
■ 750V minimum isolation
■ Ideal for high-side dc ammeters shunts
■ Provisions for +12V operation
■ Includes all the features of the standard DMS-EB board
■ Use with all DMS-30PC and DMS-30LCD
(5V models only)
■ –25 to +60°C operating temperature range
Ordering Information
Functional Specifi cations
DMS-EB-DC/DC-C DC/DC converter board (with mating connector)
DMS-BZL1-C Bezel assembly
DMS-BZL2-C Bezel assembly with sealing gasket
Input Voltage +5V (±5%)
Input Current:
Typical +150mA
Maximum +250mA
Regulator Input Voltage Range
(LM7805CT):
DMS-30PC-X-XS +7.5 to +9.5Vdc
DMS-30PC-X-RL +7.5 to +18Vdc
DMS-30LCD-X-5(B) +7.5 to +18Vdc
Output Voltage +5V (±5%)
Isolation 750V, minimum
Operating Temperature 0 to +60°C
Storage Temperature – 20 to +75°C
Dimensions: 2.02" (51.31mm)L
0.83" (21.08mm)W
Humidity (Non-condensing) 0 to 95%
R3
R1 R2
R5 R4
U2
SG10
SG11 SG9 SG8 SG7
C3
SG14
SG6 SG5
C4
J1
SG4
SG3 SG1
SG2
C2
1
SG12
SG13
12
123456
U1
R6
TA = 25°C, VCC = +5V
www.murata-ps.com/support
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. © 2015 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/
DMS-EB-DC/DC
DC/DC Converter and Isolation Board for
DMS-30PC/LCD Meters
MPM_DMS-EB-DCDC.C01 Page 2 of 2
SG13
(–) INPUT LO
(+) INPUT HI
ANALOG
COMMON
+1.23V
REF. OUT
REF. OUT
REF. IN
12
11
8
7
10
9
R3
10.5k
R4
2k SG7
SG11
R1
R2
SG10
SG14
SG9
SG8
SG12
R5
50k
SG6 SG4
SG5
C3
22μF
10V
C4
0.1μF
50V
+
C2
0.22μF
50V
LM7805CT
R6
4.7k
SG3
SG2
SG1
DP 3
DP 2
DP 1
+5V SUPPLY
/
+BATTERY
3
4
5
6
2
1
5V RETURN/
–BATTERY
TEST/
BACKLIGHT
(+) (–) IN OUT
+V
GND
HI LO TST TST –V
Components are user-supplied
and not part of the standard product
Components are part of the resistor accessory
kit RN-DMS (see Ordering Information).
J1
Closed solder gap
Open solder gap
U2
U1
+V
IN
-V
IN
+V
OUT
-V
OUT
+V
IN
+V
OUT
123456
Figure 1. DMS-EB-DC/DC Schematic Diagram
