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STPM32 数据表(PDF) 58 Page - STMicroelectronics |
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STPM32 数据表(HTML) 58 Page - STMicroelectronics |
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58 / 121 page  Theory of operation STPM32, STPM33, STPM34 58/121 DS10272 Rev 8 Figure 44. Swell detection process Sag and swell threshold calculation Thresholds for sag voltage detection are calculated below, according to the following input parameters: VL: line voltage nominal RMS value VSAG: target RMS value of sag voltage R1, R2: voltage divider resistors AV = 2, voltage channel gain DSAG = 210, length of sag threshold register calV = 0.875, calibrator mid value Table 16. Voltage sag Parameter Value SAG peak voltage Input signal Percentage of FS input Vin_SAG_peak FS VSAG Vref -------------- AV 2calV R2 R1 R2 + -------------------- = |
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