參數(shù)資料
型號(hào)： ADM1041AARQZ-REEL
廠商： ANALOG DEVICES INC
元件分類： 通信及網(wǎng)絡(luò)
英文描述： Secondary-Side Controller with Current Share and Housekeeping
中文描述： SPECIALTY TELECOM CIRCUIT, PDSO24
封裝： LEAD FREE, MO-137AE, QSOP-24
文件頁(yè)數(shù)： 27/56頁(yè)
文件大?。?/td> 991K
代理商： ADM1041AARQZ-REEL
ADM1041A
OSCILLATOR AND TIMING GENERATORS
An on-board oscillator is used to generate timing signals. Some
trimming of the oscillator is provided to adjust for variations in
processing.
Rev. 0 | Page 27 of 56
All timing generated from the oscillator is expected to meet the
same tolerances as the oscillator. Because individual delay
counters are generally two to three bits, the worst error is one
clock period into these counters, which is 25% of the nominal
delay period. None of these tolerances are extremely critical.
LOGIC I/O AND MONITOR PINS
Apart from pins required for the various key analog functions, a
number of pins are used for logic level I/O signals. If the logic
I/O function is not required, the pins may be reconfigured as
general-purpose comparators for analog level monitoring
(MON) and may be additionally configured to have typical
OVP and UVP properties, either positive-going or negative-
going, depending on whether a positive supply output or a
negative supply output is being monitored. The status of all
protection and monitoring comparators is held in registers that
can be read by a microprocessor via the SMBus. Certain control
bits may be written to via the SMBus.
CBD/ALERT
This pin can be used either as a crowbar driver or as an SMBus
alert signal to indicate that a fault has occurred. It is typically
configured to respond to a variety of status flags, as detailed in
Registers 1Ah and 1Bh. The primary function of this pin is as a
crowbar driver, and as such it should be configured to respond
to the OV fault status flag. It can be configured to respond to
any or all of a variety of fault status flags, including a micro-
processor writable flag, and can be configured as latching or
nonlatching. It may also be configured as an open-drain
N-channel or P-channel MOSFET and as positive or negative
(inverted) logic. A pull-up or pull-down resistor is required.
This pin may be wire-OR’ed with the same pin on other
ADM1041A’s in the power supply.
The alternative function is an SMBus alert output that can be
used as an interrupt to a microprocessor. If a fault occurs, the
microprocessor can then query the ADM1041A(s) about the
fault status. This is intended to avoid continuously polling the
ADM1041A(s).
Routinely, the microprocessor needs to gather other data
from the ADM1041A(s), which can include the fault status,
so the ALERT function may not be used. Also, the simplest
microprocessors may not have an interrupt function. This
allows the CBD/ALERT pin to be used for other functions.
MON1
This is the alternative analog comparator function for the
Pulse/AC
SENSE
1 pin (Pin 9). The threshold is 1.25 V. When
MON1 is selected, AC
SENSE
1 defaults to true.
MON2
This is the alternative analog comparator function for the
AC
SENSE
2 pin (Pin 10). The threshold is 1.25 V. When MON2 is
selected, AC
SENSE
2 defaults to true.
PEN
This is the power enable pin that turns the PWM converter on
and can be configured as active high or low. This might drive an
opto-isolator back to the primary side or connect to the enable
pin of a secondary-side post regulator.
PSON
This pin is usually connected to the customer’s PSON signal
and, when asserted, causes the ADM1041A to turn on the
power output. It can be configured as active high or low.
Alternatively, a microprocessor can communicate the PSON
function to the ADM1041A using the SMBus, or the PS
ON
LINK
signal may be used. When the PSON pin is not used as such, it
can be configured as an analog input, MON3.
MON3
This is the alternative analog comparator function for the PSON
pin (Pin 16). The threshold is 1.25 V. When MON3 is selected,
PSON defaults to off.
DC_OK (POWER-OK, POWER Good, Etc.)
This output is true when all dc output voltages are within
tolerance and goes false to signify an imminent loss of power.
(Timing is programmable, see the register description). It
can be configured as an open-drain, N-channel or P-channel
MOSFET and as positive or negative (inverted) logic. A pull-up
or pull-down resistor is required. This pin may be wire-OR’ed
with the same pin on other ADM1041As in the power supply.
When the DC_OK pin is not used as such, it can be configured
as an analog input, MON4.
MON4
This is the alternative analog comparator function for the
DC_OK pin (Pin 17). The threshold is 1.25 V.
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