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SSTW005A0F41SRZ Datasheet(PDF) 6 Page - Lineage Power Corporation |
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SSTW005A0F41SRZ Datasheet(HTML) 6 Page - Lineage Power Corporation |
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6 / 15 page  GE Data Sheet SSTW005A0F Barracuda™ Series; DC-DC Converter Power Modules 36-75Vdc Input; 3.3Vdc, 5A, 15W Output March 26, 2013 ©2012 General Electric Company. All rights reserved. Page 6 Test Configurations TO OSCILLOSCOPE CURRENT PROBE LTEST 12μH CS 220μF E.S.R.<0.1 @ 20°C 100kHz 33μF Vin+ Vin- NOTE: Measure input reflected ripple current with a simulated source inductance (LTEST) of 12μH. Capacitor CS offsets possible battery impedance. Measure current as shown above. Figure 7. Input Reflected Ripple Current Test Setup. NOTE: All voltage measurements to be taken at the module terminals, as shown above. If sockets are used then Kelvin connections are required at the module terminals to avoid measurement errors due to socket contact resistance. VO(+) V O(–) 1uF . RESISTIVE LOAD SCOPE COPPER STRIP GROUND PLANE 10uF Figure 8. Output Ripple and Noise Test Setup. Vout+ Vout- Vin+ Vin- RLOAD Rcontact Rdistribution Rcontact Rdistribution Rcontact Rcontact Rdistribution Rdistribution VIN VO NOTE: All voltage measurements to be taken at the module terminals, as shown above. If sockets are used then Kelvin connections are required at the module terminals to avoid measurement errors due to socket contact resistance. Figure 9. Output Voltage and Efficiency Test Setup. = VO. IO VIN. IIN x 100 % Efficiency Design Considerations Input Source Impedance The power module should be connected to a low ac-impedance source. Highly inductive source impedance can affect the stability of the power module. For the test configuration in Figure 7, a 33μF electrolytic capacitor (ESR<0.7 at 100kHz), mounted close to the power module helps ensure the stability of the unit. Consult the factory for further application guidelines. Safety Considerations For safety-agency approval of the system in which the power module is used, the power module must be installed in compliance with the spacing and separation requirements of the end-use safety agency standard, i.e., UL 60950-1-3, CSA C22.2 No. 60950-00, and VDE 0805 (IEC60950, 3rd Edition). If the input source is non-SELV (ELV or a hazardous voltage greater than 60 Vdc and less than or equal to 75Vdc), for the module’s output to be considered as meeting the requirements for safety extra-low voltage (SELV), all of the following must be true: The input source is to be provided with reinforced insulation from any other hazardous voltages, including the ac mains. One VIN pin and one VOUT pin are to be grounded, or both the input and output pins are to be kept floating. The input pins of the module are not operator accessible. Another SELV reliability test is conducted on the whole system (combination of supply source and subject module), as required by the safety agencies, to verify that under a single fault, hazardous voltages do not appear at the module’s output. Note: Do not ground either of the input pins of the module without grounding one of the output pins. This may allow a non-SELV voltage to appear between the output pins and ground. The power module has extra-low voltage (ELV) outputs when all inputs are ELV. For input voltages exceeding –60 Vdc but less than or equal to –75 Vdc, these converters have been evaluated to the applicable requirements of BASIC INSULATION between secondary DC MAINS DISTRIBUTION input (classified as TNV-2 in Europe) and unearthed SELV outputs. The input to these units is to be provided with a maximum 3A time-delay fuse in the ungrounded lead. |
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