Precision Quad Supply And Line Monitor

The UC1904 Quad Supply Monitor will respond to under- and over-volt- age conditions on up to four continuously monitored voltage levels. Four independent positive voltages CAN be monitored or, alternatively, two of the sense inputs are preset to monitor -5V and -12V supplies. The de- vice also monitors Over-Current and Line Sense inputs, both with preci- sion input thresholds. Four Open Collector outputs on the UC1904 give the following re- sponses: 1. The OV/OC output is a latched over-voltage, or over-current response. 2. A Power Good signal responds low with any fault detection on power-up a programmable delay is used to hold this output low for a system Power On Reset signal. 3. The PWRW output responds only to a Line Sense input, for early warning of power failures. 4. The last open collector, the ON/OFF output, generates a delayed supply OFF control signal in response to an OFF input command, under-voltage condition, or line fault detection. The OV-UV fault window is adjustable with a programming input. The thresholds are centered around the precision 2.5V reference, with a scaled hysteresis for precise, glitch free operation. In the positive mode of operation, the fault windows at each of the sense inputs CAN be inde- pendently scaled using external resistors and the 2.5V reference output. An Auto Restart function couples with the under-voltage and line sens- ing circuits to allow controlled power supply start-up and shutdown. By Texas Instruments
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UC1904 Pinout, Pinouts
UC1904 pinout,Pin out
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