P. O. Box 1329, Hillsborough, N. C. 27278, U.S.A.. ELECTRONICS CO., INC. 74- V OUTPUT DC-DC CONVERTERS. • OPERATE LOCOMOTIVE ELECTRONICS. ON 12-V OR 2...
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ELECTRONICS CO., INC.
P. O. Box 1329, Hillsborough, N. C. 27278, U.S.A.
SERIES 1737 DC-DC CONVERTERS BULLETIN NO. 2081A
74-V OUTPUT DC-DC CONVERTERS • OPERATE LOCOMOTIVE ELECTRONICS ON 12-V OR 24-V VEHICLES • OUTPUT CURRENT UP TO 4 AMPERES • -40°C to +70°C OPERATING TEMPERATURE RANGE • CONVECTION COOLED • EXTREMELY RUGGED AND RELIABLE Model 1737-12-74-4
Models 1737-12-74-4 and 1737-24-74-4 are dc-to-dc converters designed to provide a nominal 74-Vdc output from 12-Vdc and 24-Vdc vehicles, respectively. Conservative electrical design, very high operating efficiency and rugged mechanical construction make them well suited for powering voice/data radios and other sensitive electronic loads in the harsh railroad vehicle environment. SPECIFICATONS Input Voltage Range For Model 1737-12-74-4: 10.5 Vdc to 15 Vdc For Model 1737-24-74-4: 21 Vdc to 30 Vdc Output Voltage 74 Vdc nominal. Output voltage is directly proportional to input voltage. Output Current 4 amperes (continuous duty) Output Voltage Variation Versus line: Output voltage is directly proportional to input voltage Versus load: Less than ± 3 volts for the load range from 0.4 to 4.0 amperes Output Voltage Ripple Typically less than 50 mV rms. Conversion Efficiency Greater than 90% over most of the load range. No-load input power is typically about 3 watts.
Protection Good installation practice for mobile electronic equipment dictates that input fuses or circuit breakers should be located at the power-source end of the cables feeding the converter. For this reason, no user-serviceable protection devices are built inside the Model 1737 to protect against fault conditions at the input to the converter. Instead, an appropriately-rated fuse or circuit breaker should be installed at or near the dc input source in series with the positive (+) input line. Protection against accidental reversal of the dc input-voltage polarity during installation is provided by an internal shunt diode working in conjunction with the aforementioned usersupplied input fuse or circuit breaker. Isolation Isolation capable of passing a 1,500-Vdc insulation stress test is provided between the converter circuitry and chassis ground. The input and output are not isolated from each other and share a common return. Ambient Temperature Range -40°C to +70°C (-40°F to +158°F) (Convection Cooling)
Input/Output Connections Input and output connections are provided via a heavy-duty barrier-strip terminal block. The terminal block screws accept lugs for use with #10 hardware. A chassis ground connection is provided for use with #8 hardware. Mechanical Size: Dimensions given in inches (mm): 2.5 (64) high x 8.2 (203) wide x 7.6 (191) deep (excluding flanges and terminal block). Mounting flange on base is 0.5 (13) wide (each side). Terminal block extends 0.8 (20) from top panel. Weight: 3.5 pounds (1.6 Kg) Mounting: Mounting flange on base accepts four #10 screws. Hole pattern is 4.5 (114) along each flange and 8.0 (203) front-to-back (flange-to-flange). For Additional Information Telephone: (919) 732-9351 Fax: (919) 732-9359 Web: www.wilmoreelectronics.com Information provided in this bulletin is subject to change without notice.
DESIGNERS AND MANUFACTURERS OF SOLID-STATE POWER CONVERSION EQUIPMENT
