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Inputs for Monitoring up to Four
Separate Supply Voltage Levels
Internal Inverter for Sensing a
Negative Supply Voltage
Line/Switch Sense Input for Early
Power Source Failure Warning
Programmable Under- and
Over-Voltage Fault Thresholds
with Proportional Hysteresis
A Precision 2.5V Reference
General Purpose Op-Amp for
Auxiliary Use
Three High Current, >30mA,
Open-Collector Outputs Indicate
Over-Voltage, Under-Voltage
and Power OK Conditions
Input Supply Under-Voltage
Sensing and Start-Latch
Eliminate Erroneous Fault Alerts
During Start-Up
8-40V Supply Operation with
7mA Stand-By Current
DESCRIPTION
The UC1903 family of quad supply and line monitor integrated circuits will re-
spond to under- and over-voltage conditions on up to four continuously moni-
tored voltage levels. An internal op-amp inverter allows at least one of these
levels to be negative. A separate line/switcher sense input is available to pro-
vide early warning of line or other power source failures.
The fault window adjustment circuit on these devices provides easy program-
ming of under- and over-voltage thresholds. The thresholds, centered around
a precision 2.5V reference, have an input hysteresis that scales with the win-
dow width for precise, glitch-free operation. A reference output pin allows the
sense input fault windows to be scaled independently using simple resistive
dividers.
The three open collector outputs on these devices will sink in excess of 30mA
of load current when active. The under- and over-voltage outputs respond af-
ter separate, user defined, delays to respective fault conditions. The third out-
put is active during any fault condition including under- and over-voltage,
line/switcher faults, and input supply under-voltage. The off state of this out-
put indicates a "power OK" situation.
An additional, uncommitted, general purpose op-amp is also included. This
op-amp, capable of sourcing 20mA of output current, can be used for a num-
ber of auxiliary functions including the sensing and amplification of a feed-
back error signal when the 2.5V output is used as a system reference.
In addition, these ICs are equipped with a start-latch to prevent erroneous un-
der-voltage indications during start-up. These parts operate over an 8V to
40V input supply range and require a typical stand-by current of only 7mA.
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BLOCK DIAGRAM
Note: Pin numbers refer to J, N and DW packages.
4/97
UC2903N 產(chǎn)品屬性
20
集成電路 (IC)
PMIC - 監(jiān)控器
-
多壓監(jiān)控器
4
推挽式，圖騰柱
低有效
可調(diào)節(jié)/可選擇
可調(diào)節(jié)/可選擇
-40°C ~ 85°C
通孔
18-DIP（0.300"，7.62mm）
18-PDIP
管件
296-11207-5
UC2903N相關(guān)型號(hào)PDF文件下載
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