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STPM33 データシート(PDF) 51 Page - STMicroelectronics |
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STPM33 データシート(HTML) 51 Page - STMicroelectronics |
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51 / 121 page  DS10272 Rev 8 51/121 STPM32, STPM33, STPM34 Theory of operation 121 RMS block architecture is shown in Figure 38: Figure 38. RMS block If the cut-off frequency of an LP filter is set much below the input signal spectrum, it can be considered as an average operator. In this case and according to the figure, the first LP filter averages its input signal which is produced by division and multiplication: Equation 7 By assumption, the feedback signal R is DC type and therefore, it can be extracted from the average operation and the above equation can be rearranged into: Equation 8 By a square-root operation on both sides of previous equation we get: Equation 9 which is RMS value exact definition. / LPF 1/2 LPF - GIPG2803141121LM R X 2 R ------ = R 2 X 2 = RX 2 = |
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