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ADP1047-300-EVALZ Datasheet(PDF) 21 Page - Analog Devices |
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ADP1047-300-EVALZ Datasheet(HTML) 21 Page - Analog Devices |
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21 / 84 page  Data Sheet ADP1047/ADP1048 Rev. 0 | Page 21 of 84 AC Line Value Detection To operate, the controller must detect the ac line value. At startup, the controller waits for the PSON signal (hardware PSON, software PSON, or both, depending on how the part is programmed). When the PSON signal is present, the controller looks for the ac line period and value (see Figure 18). VIN_ON (REG 0x35) VAC BROWN_OUT FLAG (REG 0xFE80[2]) Figure 18. VAC Detection for Startup The start-up value for the ac line used by the controller to initiate the start-up procedure is stored in the VIN_ON register (Register 0x35). This value is the minimum rms value of the ac line required for the system to start up. The controller measures the value of VAC at every half line cycle and compares it with VIN_ON. If VAC is larger than the value in the VIN_ON register, the soft start procedure is initiated and the BROWN_OUT flag is reset. AC Line Early Fault Detection After the VIN_ON limit is crossed and the system starts up, the controller constantly monitors the condition of the ac line (see Figure 19). TIMER 1/4 VAC VIN_LOW FLAG (REG 0x7C[3]) VIN_OFF (REG 0x36) TIMER 1/4 Figure 19. AC Line Early Fault Detection To provide early detection of ac line faults, the instantaneous value of VAC is compared to the VIN_OFF value in Register 0x36. If VAC remains below the VIN_OFF threshold for a time longer than the programmed period, the VIN_LOW flag is set in Register 0x7C. The programmed period can be either a frac- tion of the detected ac line period (one-quarter or one-half) or it can be an absolute time (2 ms or 4 ms); the value is set in Register 0xFE2E. The controller does not take any action, but the VIN_LOW signal can be used to set the AC_OK signal and to trigger immediate actions in the power system. The VIN_OFF threshold is intended solely to provide early warning of problems on the ac line; it is not used to shut down the power supply. The VIN_UV_FAULT_LIMIT register (Register 0x59) is used for that purpose. VACMAX = 265VAC ADC INPUT RANGE = 1.6V VACMIN = 90VAC VIN_OV_FAULT_LIMIT = 270VAC (REG 0x55) VIN_ON = 85VAC (REG 0x35) VIN_OFF = 70VAC (REG 0x36) VIN_UV_FAULT_LIMIT = 70VAC (REG 0x59) VIN_UV_WARN_LIMIT = 80VAC (REG 0x58) HIGH LINE LIMIT (VACTH) = 180V (REG 0xFE35) LOW LINE LIMIT (VACTH) = 150V (REG 0xFE36) HYSTERESIS ZONE Figure 20. Input Voltage Limits |
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