IP1543

• 4.5 to 40V operation over full temperature range
• Reference voltage trimmed to 1% accuracy
• Includes overvoltage, undervoltage and current sensing
• Programmable time delays
• SCR "Crowbar" drive of 300mA
• Remote activation capability
• Optional overvoltage latch capability

The IP1543 power supply supervisory circuits contain all the functions necessary to monitor and control the output of a sophisticated power supply system. Included on the chip are over-voltage (O.V.) sensing with externally programmable delay used to trigger an external SCR "Crowbar", under-voltage (U.V.) sensing with externally programmable delay used to sense either the power supply output or the line input voltage, a third op-amp/comparator with provision for external compensation and/or offset programming used for either current limiting or as an additional voltage monitor, and a voltage reference trimmed to ±1%.