DMS-EB-DC/DC DC/DC Converter and Isolation Board for DMS-30PC/LCD Meters FEATURES N Provide isolated +5V power for DMS-30 Series meters N 750V minimum isolation N Ideal for high-side dc ammeters shunts N Provisions for +12V operation N Includes all the features of the standard DMS-EB board N Use with all DMS-30PC and DMS-30LCD (5V models only) N –25 to +60°C operating temperature range 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-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 C4 12 1 R1 SG14 R2 allowable regulator input voltage SG10 C3 C1 SG11 SG9 SG8 SG7 ranges (see Functional SpecificaSG6 SG5 U1 tions) will cause device overR3 R6 C4 heating! As is the case when U2 specifying any electronic power SG2 SG4 component, be sure to consult all J1 SG12 R5 R4 SG3 SG1 1 2 3 4 5 6 applicable manufacturer's data sheets. Functional Specifications TA = 25°C, VCC = +5V +5V (±5%) Input Current: Typical Maximum +150mA +250mA Regulator Input Voltage Range (LM7805CT): DMS-30PC-X-XS DMS-30PC-X-RL DMS-30LCD-X-5(B) +7.5 to +9.5Vdc +7.5 to +18Vdc +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% SG13 Input Voltage Ordering Information DMS-EB-DC/DC DMS-BZL1 DMS-BZL2 RN-DMS DC/DC converter board (with mating connector) Bezel assembly Bezel assembly with sealing gasket Resistor accessory kit For full details go to www.murata-ps.com/rohs www.murata-ps.com Technical enquiries email: [email protected], tel: +1 508 339 3000 MPM_DMS-EB-DCDC.B01 Page 1 of 2 DMS-EB-DC/DC DC/DC Converter and Isolation Board for DMS-30PC/LCD Meters (–) INPUT LO 12 SG14 (+) INPUT HI ANALOG COMMON U1 R2 11 -VIN R1 SG9 +1.23V REF. OUT + SG10 10 R3 10.5k R4 2k 9 REF. IN 2 -VOUT SG7 +5V SUPPLY/ +BATTERY TEST/ BACKLIGHT 3 5V RETURN/ –BATTERY +VOUT SG6 SG11 SG4 C4 0.1μF 50V SG3 4 DP 3 U2 SG2 8 5 +VIN R5 50k SG13 C3 22μF 10V R6 4.7k SG8 REF. OUT 1 +VOUT +VIN LM7805CT DP 2 SG1 7 C2 0.22μF 50V SG5 SG12 6 DP 1 J1 Components are user-supplied and not part of the standard product Components are part of the resistor accessory kit RN-DMS (see Ordering Information). Open solder gap 1 2 3 4 5 6 Closed solder gap HI LO TST TST +V –V (+) (–) IN OUT GND Figure 1. DMS-EB-DC/DC Schematic Diagram USA: 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: [email protected] ISO 9001 and 14001 REGISTERED 11/26/08 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. www.murata-ps.com Mansfield (MA), Tel: (508) 339-3000, email: [email protected] Canada: Toronto, Tel: (866) 740-1232, email: [email protected] UK: Milton Keynes, Tel: +44 (0)1908 615232, email: [email protected] France: Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: [email protected] Germany: München, Tel: +49 (0)89-544334-0, email: [email protected] Japan: Tokyo, Tel: 3-3779-1031, email: [email protected] Osaka, Tel: 6-6354-2025, email: [email protected] China: Shanghai, Tel: +86 215 027 3678, email: [email protected] Guangzhou, Tel: +86 208 221 8066, email: [email protected] Singapore: Parkway Centre, Tel: +65 6348 9096, email: [email protected] Technical enquiries email: [email protected], tel: +1 508 339 3000 MPM_DMS-EB-DCDC.B01 Page 2 of 2