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DNT12S0A0S05NFA Datasheet(PDF) 6 Page - Delta Electronics, Inc. |
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DNT12S0A0S05NFA Datasheet(HTML) 6 Page - Delta Electronics, Inc. |
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6 / 13 page  DS_DNT12SMD05_12192008 6 TEST CONFIGURATIONS VI(+) VI(-) BATTERY 2 100uF Tantalum L TO OSCILLOSCOPE Note: Input reflected-ripple current is measured with a simulated source inductance. Current is measured at the input of the module. Figure 19: Input reflected-ripple test setup Vo GND COPPER STRIP 10uF tantalum 1uF ceramic SCOPE Resistive Load Note: Use a 10μF tantalum and 1μF capacitor. Scope measurement should be made using a BNC connector. Figure 20: Peak-peak output noise and startup transient measurement test setup SUPPLY I VI Vo GND Io LOAD CONTACT AND DISTRIBUTION LOSSES CONTACT RESISTANCE Figure 21: Output voltage and efficiency measurement test setup Note: All measurements are taken at the module terminals. When the module is not soldered (via socket), place Kelvin connections at module terminals to avoid measurement errors due to contact resistance. % 100 ) ( × × × = Ii Vi Io Vo η DESIGN CONSIDERATIONS Input Source Impedance To maintain low-noise and ripple at the input voltage, it is critical to use low ESR capacitors at the input to the module. The input capacitance should be able to handle an AC ripple current of at least: Arms Vin Vout Vin Vout Iout Irms ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − = 1 The power module should be connected to a low ac-impedance input source. Highly inductive source impedances can affect the stability of the module. An input capacitance must be placed close to the modules input pins to filter ripple current and ensure module stability in the presence of inductive traces that supply the input voltage to the module. Safety Considerations For safety-agency approval the power module must be installed in compliance with the spacing and separation requirements of the end-use safety agency standards. For the converter output to be considered meeting the requirements of safety extra-low voltage (SELV), the input must meet SELV requirements. The power module has extra-low voltage (ELV) outputs when all inputs are ELV. The input to these units is to be provided with a maximum (TBD) A of glass type fast-acting fuse in the ungrounded lead. |
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