DMS-EB-DC/DC

DC/DC Converter and Isolation Board for

DMS-30PC/LCD Meters

MPM_DMS-EB-DCDC.B01 Page 2 of 2

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

notice.

© 2008 Murata Power Solutions, Inc.

USA:

Mansfield (MA), Tel: (508) 339-3000, email: sales@murata-ps.com

Canada:

Toronto, Tel: (866) 740-1232, email: toronto@murata-ps.com

UK:

Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com

France:

Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com

Germany:

München, Tel: +49 (0)89-544334-0, email: munich@murata-ps.com

Japan:

Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com

Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com

China:

Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com

Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com

Singapore:

Parkway Centre, Tel: +65 6348 9096, email: singapore@murata-ps.com

Murata Power Solutions, Inc.

11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.

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

www.murata-ps.com

11/26/08

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

12

34

5

6

Figure 1. DMS-EB-DC/DC Schematic Diagram