SG1548 Microsemi Corporation, SG1548 Datasheet
SG1548
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SG1548 Summary of contents
Page 1
... DESCRIPTION The SG1548 is an integrated circuit capable of monitoring up to four positive DC supply voltages simultaneously for overvoltage and undervoltage fault conditions. An on-chip inverting op amp also allows monitoring one negative DC voltage. The fault tolerance window is accurately programmable from ±5% to ±40% using a simple divider network on the 2.5V reference. A single external capacitor sets ...
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... Lower Threshold Input Range ............................. Fault Tolerance Window Range .......................... Fault Output Sink Current Range ............................. Note 2. Range over which the device is functional. ELECTRICAL CHARACTERISTICS (Unless otherwise specified, these specifications apply over the operating ambient temperatures for SG1548 with - SG3548 with temperatures equal to the ambient temperature ...
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... LOW. The effective tolerance on any input may be broadened with an additional resistor to the voltage reference. The example on the back page shows a ±10% tolerance on the +5Vsupply although the SG1548 is programmed for a ±5% tolerance. The procedure for calculating the resistor value is found in the SG1548 Application Note. ...
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... APPLICATION EXAMPLE In this example, the SG1548 simultaneously monitors four DC voltages: +5V, +24V, and ±15V. Three different fault tolerances are programmed: ±5% on the two 15V supplies, ±10% on the +5V supply, and ±20% on the +24V supply. The 5 F delay capacitor provides 125 milliseconds of fault delay. ...