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DNM Datasheet(PDF) 6 Page - Delta Electronics, Inc. |
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DNM Datasheet(HTML) 6 Page - Delta Electronics, Inc. |
6 / 15 page DS_DNM10SMD10_07182012 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 17: Input reflected-ripple test setup Vo GND COPPER STRIP 10uF tantalum 1uF ceramic SCOPE Resistive Load Not e: Use a 10μF tantalum and 1μF capacitor. Scope measurement should be made using a BNC connector. Figure 18: Peak-peak output noise and startup transient measurement test setup SUPPLY I VI Vo GND Io LOAD CONTACT AND DISTRIBUTION LOSSES CONTACT RESISTANCE Figure 19: 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 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. Figure 20 shows the input ripple voltage (mVp-p) for various output models using 4x47 uF low ESR tantalum capacitors (SANYO P/N:16TPB470M, 47uF/16V or equivalent) and 4x22 uF very low ESR ceramic capacitors (TDK P/N:C3225X7S1C226MT, 22uF/16V or equivalent). The input capacitance should be able to handle an AC ripple current of at least: Arms Vin Vout Vin Vout Iout Irms 1 0 50 100 150 200 250 300 0 1 2 3 4 5 6 Output Voltage (Vdc) Tantalum Ceramic Figure 20: Input ripple voltage for various Output models, Io = 10A (Cin = 4x47uF tantalum capacitors and 4x22uF ceramic capacitors at the input) |
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