DATEL DMS-EB-DC-DC Datasheet

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Actual Size

®®

DMS-EB-DC/DC

DC/DC Converter

and Isolation Board for

DMS-30PC/LCD Meters

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 (except blue)

DMS-30LCD (5V models only)

C4

U2

SG3

1

SG2

SG1

12

SG11 SG9 SG8

SG13

SG12

R1

SG10

R3

R5 R4

SG7

SG6 SG5

J1

123456

SG14

R2

C1

R6

C3

U1

C4

SG4

Functional Specifi cations (TA = 25°C, VCC = +5V)

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 x 0.83" (21.08mm)W

Humidity (Non-condensing) 0 to 95%

Ordering Information

DMS-EB-DC/DC DC/DC converter board
(with mating connector)

DMS-BZL1 Bezel assembly
DMS-BZL2 Bezel assembly with sealing gasket
RN-DMS Resistor accessory kit

Description: The DMS-EB-DC/DC Application Board provides isolated +5V
power for DATEL's 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. DATEL's new Panel Meter Catalog has a
detailed application note on dc ammeters.

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-EB­DC/DC with any DMS-30PC meter (except blue LED models) 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 cations) will cause device overheating! As is the case
when specifying any electronic power component, be sure to consult all applicable
manufacturer's data sheets.

12

(–) INPUT LO

11

(+) INPUT HI

10

ANALOG

COMMON

9

+1.23V

REF. OUT

8

REF. OUT

7

REF. IN

!

Components are user-supplied
and not part of the standard product

"

Components are part of the resistor accessory
kit RN-DMS (see Ordering Information).

SG13

SG14

SG9

SG8

SG12

R3

10.5k

+V

OUT

+V

R2

"

"

R5
50k

SG10

!

R1

"

R4

SG7

2k

SG6

!

1.5µF

SG11

C1

50V

SG4

SG5

123456

HI LO TST TST –V
(+) (–) IN OUT+VGND

IN

U1

-V

-V

IN

C4

0.1µF

+V

OUT

50V

!

U2

+V

IN

LM7805CT

C2

0.22µF
50V

J1

C3

+

22µF
10V

OUT

1

2

R6

4.7k
3

SG3

4

SG2

5

SG1

6

Open solder gap

Closed solder gap

+5V SUPPLY
+BATTERY

TEST/
BACKLIGHT

5V RETURN/
–BATTERY

DP 3

DP 2

DP 1

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

DS-0396B 03/01

DA TEL, Inc., Mansfi eld, MA 02048 (USA) • Tel: [phone] Fax: [phone] • Email: [e-mail] • Internet: www.datel.com

DATEL 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. The DATEL logo is a registered DATEL, Inc. trademark.