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CW025ACL-M Datasheet(PDF) 11 Page - General Semiconductor |
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CW025ACL-M Datasheet(HTML) 11 Page - General Semiconductor |
11 / 20 page Lineage Power 11 Data Sheet April 2008 36 Vdc to 75 Vdc Input; 25 W CW025 Triple-Output-Series Power Modules: Test Configurations (continued) 8-810(C).c Note: Use the specified ceramic capacitor. Scope measurement should be made by using a BNC socket. Position the load between 50 mm (2 in.) and 75 mm (3 in.) from the module. Figure 19. Output Noise Measurement Test Setup 8-749(C).c Note: All measurements are taken at the module terminals. When socketing, place Kelvin connections at module terminals to avoid measurement errors due to socket contact resistance. Figure 20. Triple Output Voltage and Efficiency Measurement Test Setup Design Considerations Input Source Impedance The power module should be connected to a low ac-impedance input source. Highly inductive source im- pedances can affect the stability of the power module. A 33 µF electrolytic capacitor (ESR < 0.7 Ω at 100 kHz) mounted close to the power module helps to ensure the stability of the unit. 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-1950, CSA 22.2-950, and EN60950. For the converter output to be considered meeting the requirements of safety extra-low voltage (SELV), one of the following must be true: s All inputs are SELV and floating, with the output also floating. s All inputs are SELV and grounded, with the output also grounded. s Any non-SELV input must be provided with reinforced insulation from any other hazardous voltages, includ- ing the ac mains, and must have a SELV reliability test performed on it in combination with the convert- ers. Inputs must meet SELV requirements. If the input meets extra-low voltage (ELV) requirements, then the converter’s output is considered ELV. The input to these units is to be provided with a maxi- mum 5 A normal-blow fuse in the ungrounded lead. VO2 (+) VO3 (–) SCOPE 0.47 µF COPPER STRIP 0.47 µF RLOAD3 VO1 (–) 0.1 µF SCOPE RLOAD1 VO1 (+) SCOPE VO2, VO3, COM RLOAD2 VI(+) I I I O2 SUPPLY CONTACT RESISTANCE CONTACT AND DISTRIBUTION LOSSES LOAD3 SENSE VO2(+) SENSE VO3(–) VO2(+) VI(–) VO1(+) VO1(–) LOAD2 LOAD1 I O1 SENSE VO1(–) SENSE VO1(+) VO2, VO3 COM SENSE VO2, VO3 COM I O3 VO3(+) η VOj + () VCOM – []IOj j1 = 3 ∑ VI + () VI – () – () + []II --------------------------------------------------------------- 100 × = |
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