ADP1048ARQZ-R7 datasheet(23/84 Pages) AD

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Data Sheet

ADP1047/ADP1048

Rev. 0 | Page 23 of 84

Missing AC Line Cycles

Figure 22 shows examples of the typical missing ac line cycles

fault. The VIN_LOW flag is set when the instantaneous voltage

is below VIN_OFF for more than a quarter or half line cycle

(depending on how it is programmed). This flag can be used as

an early warning to the system via the AC_OK pin when more

than a half cycle is missing. The BROWN_OUT flag is also set;

this flag does not cause a shutdown.

If any other flag that is programmed for shut down is set (in this

example, VOUT_UV_FAULT), the power supply shuts down,

the INRUSH pin is asserted, and the controller prepares for the

next soft start cycle.

If the BROWN_OUT flag is cleared before VOUT drops below

the VOUT_UV_FAULT_LIMIT value (Register 0x44), opera-

tion resumes in normal mode (or fast loop mode if enabled);

otherwise, if VOUT drops below VOUT_UV_FAULT_LIMIT,

the INRUSH pin is reset and a new soft start cycle is started.

PSON Delay

The PSON start delay is programmable using Register 0xFE06,

Bits[3:2]. Four options are available: 0 ms, 50 ms, 250 ms, and

1000 ms.

Brownout Conditions

Brownout is another typical line fault condition in which the

line drops below the minimum specified operating level. This

level can be set with VIN_UV_FAULT_LIMIT (Register 0x59).

This flag can be programmed according to the standard PMBus

flag response. For example, it can be programmed to shut down

and restart after a certain delay.

During brownout, there are other conditions that can occur,

such as input overcurrent or output undervoltage. Each of these

faults can be programmed to shut down or disable the output,

based on the response action.

VIN_ON (REG 0x35)

VIN_OFF (REG 0x36)

VAC

VIN_LOW FLAG

(REG 0x7C[3])

BROWN_OUT FLAG

(REG 0xFE80[2])

INRUSH PIN

VOUT

VOUT_UV_FAULT_LIMIT

(REG 0x44)

SOFT START TIME

(REG 0xFE2D[2:0])

INRUSH DELAY TIME

(REG 0xFE2E[2:0])

Figure 22. Line Fault (Missing Cycles) Timing Diagram

SHUTDOWN

VAC

VIN_ON (REG 0x35)

VIN_UV_FAULT_LIMIT

(REG 0x59)

BROWN_OUT FLAG

(REG 0xFE80[2])

VIN_UV_FAULT FLAG

(1 CYCLE DEBOUNCE)

INRUSH PIN

Figure 23. Brownout Timing Diagram (VIN_UV_FAULT_RESPONSE Register Programmed to Shut Down After a One-Cycle Debounce)

ADP1048ARQZ-R7 数据表(PDF) 23 Page - Analog Devices

ADP1048ARQZ-R7 数据表(HTML) 23 Page - Analog Devices

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