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QRW025A0F1 데이터시트(PDF) 18 Page - Lineage Power Corporation |
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QRW025A0F1 데이터시트(HTML) 18 Page - Lineage Power Corporation |
18 / 27 page Lineage Power 18 Data Sheet March 27, 2008 36 Vdc - 75 Vdc Input, 1.2 to 3.3 Vdc Output; 25A QRW025 Series Power Modules; dc-dc Converters Test Configurations Note:Measure input reflected-ripple current with a simulated source inductance (LTEST) of 12 µH. Capacitor CS off- sets possible battery impedance. Measure current as shown above. Figure 31. Input Reflected-Ripple Test Setup. Note:Use a 1.0 µF ceramic capacitor and a 10 µF aluminum or tantalum capacitor. Scope measurement should be made using a BNC socket. Position the load between 51 mm and 76 mm (2 in. and 3 in.) from the module. Figure 32. Peak-to-Peak Output Noise Measurement Test Setup. 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 33. Output Voltage and Efficiency Measurement. Design Considerations Input Source Impedance The power module should be connected to a low ac-impedance input source. Highly inductive source imped- ances can affect the stability of the power module. For the test configuration in 31, a 33 µF electrolytic capacitor (ESR < 0.7 W at 100 kHz) mounted close to the power module helps ensure stability of the unit. For other highly inductive source imped- ances, consult the factory for further application guidelines. Output Capacitance High output current transient rate of change (high di/dt) loads may require high values of output capacitance to supply the instantaneous energy requirement to the load. Tp minimize the output voltage transient drop during this transient, low E.S.R. (equivalent series resistance) capacitors may be required, since a high E.S.R. will produce a correspondingly higher voltage drop during the current tran- sient. Output capacitance and load impedance interact with the power module’s output voltage regulation control system and may produce an ’unstable’ output condition for the required values of capacitance and E.S.R.. Minimum and maximum values of output capacitance and of the capacitor’s associ- ated E.S.R. may be dictated, depending on the module’s con- trol system. The process of determining the acceptable values of capaci- tance and E.S.R. is complex and is load-dependant. Lineage provides Web-based tools to assist the power module end- user in appraising and adjusting the effect of various load conditions and output capacitances on specific power mod- ules for various load conditions. Safety Considerations For safety-agency approval of the system in which the power module is used, the power module must be installed in com- pliance with the spacing and separation requirements of the end-use safety agency standard, i.e., UL60950, CSA C22.2 No. 60950-00, and VDE 0805:2001-12 (IEC60950, 3rd Ed). These converters have been evaluated to the spacing requirements for Basic Insulation, per the above safety stan- dards; and 1500 Vdc is applied from VI to VO to 100% of out- going production. For end products connected to –48 Vdc, or –60 Vdc nomianl DC MAINS (i.e. central office dc battery plant), no further fault testing is required. Note:–60 V dc nominal bettery plants are not available in the U.S. or Canada. For all input voltages, other than DC MAINS, where the input voltage is less than 60 Vdc, if the input meets all of the requirements for SELV, then: n The output may be considered SELV. Output voltages will VI(+) VI(–) CURRENT PROBE TO OSCILLOSCOPE LTEST 12 μH BATTERY CS 220 μF ESR < 0.1 Ω @ 20 ºC 100 kHz COPPER STRIPS 1.0 μF 10 μF SCOPE VO(+) RESISTIVE VO(-) LOAD CONTACT AND SUPPLY II CONTACT VI(+) VI(–) VO(+) DISTRIBUTION LOSSES RESISTANCE IO LOAD VO(–) SENSE(–) SENSE(+) η V O(+) V O(-) – []I O V I(+) V I(-) – []I I ---------------------------------------------- ⎝⎠ ⎛⎞ 100 % × = |
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