(R) (R) DMS-EB-DC/DC Actual Size Order online at www.datel.com 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 DMS-30LCD (5V models only) 12 R1 C4 SG14 R2 SG10 SG11 SG9 SG8 SG7 C3 C1 SG6 SG5 U1 R3 SG13 R6 C4 U2 SG2 SG4 SG12 R5 J1 R4 1 2 Functional Specifications 3 4 5 DC/DC Converter and Isolation Board for DMS-30PC/LCD Meters 6 SG3 SG1 1 Description: The DMS-EB-DC/DC Application Board provides isolated +5V power for DATEL's DMS-30PC/LCD Series, 312 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 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 Specifications) will cause device overheating! As is the case when specifying any electronic power component, be sure to consult all applicable manufacturer's data sheets. (TA = 25C, VCC = +5V) Input Voltage +5V (5%) Input Current: Typical Maximum (-) INPUT LO 12 +150mA +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 +60C Storage Temperature - 20 to +75C Dimensions: 2.02" (51.31mm)L x 0.83" (21.08mm)W Humidity (Non-condensing) (+) INPUT HI ANALOG COMMON R3 10.5k 9 REF. OUT REF. IN 2 -VOUT R6 4.7k SG7 SG6 SG11 SG4 +VOUT C4 0.1F 50V U2 8 SG3 SG2 +VIN R5 50k SG13 C3 22F 10V LM7805CT SG1 7 C2 0.22F 50V SG5 SG12 3 4 5 6 +5V SUPPLY/ +BATTERY TEST/ BACKLIGHT 5V RETURN/ -BATTERY DP 3 DP 2 DP 1 J1 Components are user-supplied 0 to 95% Ordering Information DMS-BZL1 DMS-BZL2 RN-DMS R4 2k SG8 and not part of the standard product Components are part of the resistor accessory kit RN-DMS (see Ordering Information). DMS-EB-DC/DC -VIN R1 10 + U1 11 SG9 +1.23V REF. OUT SG10 R2 1 +VOUT +VIN SG14 DC/DC converter board (with mating connector) Bezel assembly Bezel assembly with sealing gasket Resistor accessory kit 1 2 3 4 5 6 HI LO TST TST +V -V (+) (-) IN OUT GND Open solder gap Closed solder gap Figure 1. DMS-EB-DC/DC Schematic Diagram DS-0396C 04/02 DATEL, Inc., Mansfield, MA 02048 (USA) * Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 * Email: sales@datel.com * 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. Specifications are subject to change without notice. The DATEL logo is a registered DATEL, Inc. trademark.