参数资料
型号: ADP1048ARQZ-R7
厂商: Analog Devices Inc
文件页数: 21/84页
文件大小: 0K
描述: IC DGTL PFC CTRLR 24QSOP
标准包装: 1
模式: 平均电流
频率 - 开关: 30kHz ~ 400kHz
电源电压: 3 V ~ 3.6 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 24-SSOP(0.154",3.90mm 宽)
供应商设备封装: 24-QSOP
包装: 标准包装
其它名称: ADP1048ARQZ-R7DKR
Data Sheet
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).
VAC
ADP1047/ADP1048
VIN_OFF (REG 0x36)
When the PSON signal is present, the controller looks for the
ac line period and value (see Figure 18).
TIMER
1/4
TIMER
1/4
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
VIN_LOW FLAG
(REG 0x7C[3])
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.
controller constantly monitors the condition of the ac line (see
Figure 19).
ADC INPUT RANGE = 1.6V
VIN_OV_FAULT_LIMIT = 270V AC (REG 0x55)
VAC MAX = 265V AC
HIGH LINE LIMIT (VAC TH ) = 180V (REG 0xFE35)
HYSTERESIS
ZONE
LOW LINE LIMIT (VAC TH ) = 150V (REG 0xFE36)
VAC MIN = 90V AC
VIN_ON = 85V AC (REG 0x35)
VIN_UV_WARN_LIMIT = 80V AC (REG 0x58)
VIN_OFF = 70V AC (REG 0x36)
VIN_UV_FAULT_LIMIT = 70V AC (REG 0x59)
Figure 20. Input Voltage Limits
Rev. 0 | Page 21 of 84
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