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ADE1202 数据表(PDF) 28 Page - Analog Devices |
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ADE1202 数据表(HTML) 28 Page - Analog Devices |
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28 / 42 page  ADE1202 Data Sheet Rev. 0 | Page 28 of 42 This VRMS value is the working voltage used together with the material group and pollution degree when looking up the creepage required by a system standard. To determine if the lifetime is adequate, obtain the time varying portion of the working voltage. To obtain the ac rms voltage, use Equation 18. 22 = − AC RMS RMS DC V VV (18) 22 466 400 AC RMS V = − (19) In this example, VAC RMS = 240 V rms. In this case, the ac rms voltage is simply the line voltage of 240 V rms. This calculation is more relevant when the waveform is not sinusoidal. The value is compared to the limits for working voltage in Table 12 for the expected lifetime, is less than a 60 Hz sine wave, and is well within the limit for a 50-year service life. Note that the dc working voltage limit in Table 12 is set by the creepage of the package as specified in IEC 60664-1. This value can differ for specific system level standards. |
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