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UC1904 датащи(PDF) 4 Page - Texas Instruments

номер детали UC1904
подробное описание детали  Precision Quad Supply and Line Monitor
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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UC1904 датащи(HTML) 4 Page - Texas Instruments

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PIN FUNCTIONAL DESCRIPTION
2.5V: This is the output of the precision 2.5V reference.
ARST Input: This input, with a 4:1 hysteretic threshold,
is used to sequence a power system through the Auto
ReStarT cycle. A delayed representation of a supply out-
put voltage is used at this pin to provide adequate startup
time for the power system, and a minimum power-off pe-
riod.
Gnd: Reference point for the internal reference and all
thresholds, as well as the return for the remainder of the
device.
LS Input: The Line Sense input is used to monitor a volt-
age that varies with the input line voltage to a system.
The input is compared to a precision 2.0V level and is
used to activate the PWRW and PG outputs, as well as
triggering the Auto Restart sequence.
OC Input: The Over-Current input can be used to re-
spond to an inverted over-current signal. A low level sig-
nal at this input latches in a fault indication at the OV/OC
output.
OFF DLY: This pin functions similarly to the POR DLY
pin to delay the turn-on of the ON/OFF output transistor.
The charging current and upper threshold are 12
µA and
2.1V.
ON/OFF Input: With a high level at this input the
ON/OFF Out pin is activated after a user-programmable
delay. A high level also activates the PG Out pin, and re-
sets the OV/OC fault latch.
On/Off Out: This output is an open collector output that
is activated by the ON/OFF Input, or the Auto Restart cir-
cuitry. Saturation voltage on this and all the open collec-
tor outputs is rated at 10mA of current.
OV/OC Out: In response to either an Over-Voltage or
Over-Current situation this output is latched active low.
There is nominal 20
µs delay in the OV path to the fault
latch, providing rejection to transient overshooting on the
monitored voltages. The low condition is cleared when
the fault latch is reset by the ON/OFF Input, or a UVLO
condition on the device.
POR DLY: This pin is used, with an external capacitor, to
program a Power-On-Reset delay. This delay is reset
whenever there is a UV condition at one of the S1-S4 in-
puts, and then triggered upon the clearing of the UV con-
dition. When reset, the voltage across the capacitor is
quickly discharged to near zero volts, and the PG Out pin
goes active low. Once triggered the capacitor is charged
by a 9
µA current source. The PG Out pin remains active
low until the delay capacitor voltage reaches a 2.1V
threshold.
PG Out: During any fault, under-voltage, or UVLO condi-
tion this output is low. A Power Good indication (output
off) is given when all supply conditions are within defined
operating limits. During power-up the PG signal is de-
layed by a programmable Power On Reset delay. During
UVLO the output is active low as long as the input sup-
ply, VIN, is above approximately 1.0V.
PWRW Out: When a low line condition is sensed by the
LS Input this output goes low. This output is disabled
(off) during a UVLO condition.
S1-S4: These are the sense inputs for OV and UV moni-
toring of external voltages. All four inputs can be used to
sense positive voltages with a simple divider to scale the
voltage level to the 2.5V centered window. The S3 and
S4 inputs can also be used to sense -12V and -5V sup-
plies respectively with no external components. This is
done with internal precision resistor dividers and two
source only op-amps that are disabled when the pins are
used in the positive mode.
VIN: Input supply for the UC1904. The device is opera-
tional with 4.75V to 18V on this pin.
WADJ: The WADJ input is used to program the OV and
UV window thresholds. The OV-UV window is centered
around the 2.5V reference and is nominally
±20% per
volt on the WADJ input pin.
UC1904
UC2904
UC3904
4


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