ADP1047ARQZ-R7 datasheet(21/84 Pages) AD

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

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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