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ADP1047ARQZ-R7 Datasheet(PDF) 20 Page - Analog Devices |
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ADP1047ARQZ-R7 Datasheet(HTML) 20 Page - Analog Devices |
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20 / 84 page  ADP1047/ADP1048 Data Sheet Rev. 0 | Page 20 of 84 LINE FAULT PROTECTIONS AND SOFT START SEQUENCING PSON OPERATION To comply with PMBus standards, the PFC circuit controlled by the ADP1047/ADP1048 can be turned on and off by the hardware PSON pin and/or the software PSON command. The setting of Bit 2 in Register 0x02 determines whether the PSON pin and/or the PSON command is used. If the PSON pin is used, the pin can be configured to be either active high or active low (see Table 18). AC LINE DETECTION The ADP1047/ADP1048 are capable of detecting several parameters of the ac line input voltage and taking the appro- priate programmed actions when necessary. The detection is a combination of time and voltage measurements and is implemented via the VAC pin, which detects the rectified ac input voltage. This allows early detection of ac line faults and early warning for the host system, thereby increasing reliability. Five main parameters are related to ac line detection. • VAC_LINE_PERIOD (Register 0xFE85) • VAC_THRESHOLD_SET (Register 0xFE25) • VAC_THRESHOLD_READ (Register 0xFE26) • MIN_AC_PERIOD_SET (Register 0xFE27) • MAX_AC_PERIOD_SET (Register 0xFE28) AC Line Period and Zero Crossing The input ac line period is measured every half period of the ac line cycle and is reported in the VAC_LINE_PERIOD register (Register 0xFE85). During the first 40 ms, the ac line period is measured between two consecutive falling crossings of the threshold value, which is set in the VAC_THRESHOLD_SET register (Register 0xFE25, Bits[6:0]). The ac line period is then measured between two consecutive falling crossings and compared to the average value of the input line voltage, which is calculated during each half line period. The VAC average reading can be found in the VAC_ THRESHOLD_READ register (Register 0xFE26, Bits[6:0]) . If the measured period is larger than MAX_AC_PERIOD_SET or smaller than MIN_AC_PERIOD_SET, the default, MAX_AC_ PERIOD_SET, is used as the value of the period. As shown in Figure 17, the two consecutive crossing points, B and C, are used to determine the zero-crossing point of the ac line. The middle point between B and C is calculated as the zero-crossing point. This information is used by the control loop, as well as the power metering block. VAC AVERAGE (REG 0xFE26) VAC THRESHOLD (REG 0xFE25) HALF AC LINE PERIOD AB C Figure 17. AC Line Period Detection |
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Similar Description - ADP1047ARQZ-R7 |
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