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T48SR3R307PNFA Datasheet(PDF) 7 Page - Delta Electronics, Inc. |
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T48SR3R307PNFA Datasheet(HTML) 7 Page - Delta Electronics, Inc. |
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7 / 12 page  DS_ T48SR3R307_10162012 7 DESIGN CONSIDERATIONS Input Source Impedance The impedance of the input source connecting to the DC/DC power modules will interact with the modules and affect the stability. A low ac-impedance input source is recommended. If the source inductance is more than a few µH, we advise adding a 100µF electrolytic capacitor mounted close to the input of the module to improve the stability. Module internal input filter is only one 1uF ceramic cap, not L-C filter or Pi filter, so the external input cap ESR loss need be paid more attention. A external inductor (1uH) placed in front of module can decrease ESR loss of the external input cap. Layout and EMC Considerations Delta’s DC/DC power modules are designed to operate in a wide variety of systems and applications. For design assistance with EMC compliance and related PWB layout issues, please contact Delta’s technical support team. An external input filter module is available for easier EMC compliance design. Below is the reference design for an input filter tested with T48SR3R307XXXX to meet EN55022 (VDE0878) class A(both q. peak and average) Schematic and Components List Figure 16 : Capacitive and inductive EMI Filter C1=47uF /100 V(Low ESR) C2=C3= 47 uF/100 V(Low ESR) C4=C5=2200pF T1=0.59mH type P0353 (Pulse) Test Result: At T = +25 °C , Vin = 48 V and Io=7.5 A Blue line is quasi peak mode; Green line is average mode. Figure 17: EMI test negative line @ T = +25 °C and Vin = 48 V Figure 18: EMI test positive line @ T = +25 °C and Vin = 48 V Safety Considerations The power module must be installed in compliance with the spacing and separation requirements of the end-user’s safety agency standard, i.e., UL60950-1, CSA C22.2 NO. 60950-1 2nd and IEC 60950-1 2nd : 2005 and EN 60950-1 2nd: 2006+A11+A1: 2010, if the system in which the power module is to be used must meet safety agency requirements. Basic insulation based on 75 Vdc input is provided between the input and output of the module for the purpose of applying insulation requirements when the input to this DC-to-DC converter is identified as TNV-2 or SELV. An additional evaluation is needed if the source is other than TNV-2 or SELV. When the input source is SELV circuit, the power module meets SELV (safety extra-low voltage) requirements. If the input source is a hazardous voltage which is greater than 60 Vdc and less than or equal to 75 Vdc, for the module’s output to meet SELV requirements, all of the following must be met: |
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