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ICL7673CPAZ Datasheet(PDF) 5 Page - Intersil Corporation |
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ICL7673CPAZ Datasheet(HTML) 5 Page - Intersil Corporation |
5 / 7 page 5 FN3183.4 July 22, 2005 Applications for the ICL7673 include volatile semiconductor memory storage systems, real-time clocks, timers, alarm systems, and over/under the voltage detectors. Other systems requiring DC power when the master AC line supply fails can also use the ICL7673. A typical application, as illustrated in Figure 12, would be a microprocessor system requiring a 5V supply. In the event of primary supply failure, the system is powered down, and a 3V battery is employed to maintain clock or volatile memory data. The main and backup supplies are connected to VP and VS, with the circuit output VO supplying power to the clock or volatile memory. The ICL7673 will sense the main supply, when energized, to be of greater potential than VS and connect, via its internal MOS switches, VP to output VO. The backup input, VS will be disconnected internally. In the event of main supply failure, the circuit will sense that the backup supply is now the greater potential, disconnect VP from VO, and connect VS. Figure 11 illustrates the use of external PNP power transistors to increase the power switching capability of the circuit. In this application the output current is limited by the beta and thermal characteristics of the power transistors. If hysteresis is desired for a particular low power application, positive feedback can be applied between the input VP and open drain output SBAR through a resistor as illustrated in Figure 12. For high power applications hysteresis can be applied as shown in Figure 13. The ICL7673 can also be used as a clipping circuit as illustrated in Figure 14. With high impedance loads the circuit output will be nearly equal to the greater of the two input signals. VP VO VS GND Pbar 8 2 1 6 VO +5V OR +3V RI STATUS INDICATOR LITHIUM BATTERY GND +5V PRIMARY SUPPLY 4 + - FIGURE 7. ICL7673 BATTERY BACKUP CIRCUIT VP VO VS GND 8 2 1 VO +5V OR +3V RECHARGEABLE BATTERY GND +5V PRIMARY SUPPLY 4 RC + - FIGURE 8. APPLICATION REQUIRING RECHARGEABLE BATTERY BACKUP FIGURE 9. POWER SUPPLY FOR LOW POWER PORTABLE AC TO DC SYSTEMS FIGURE 10. TYPICAL MICROPROCESSOR MEMORY APPLICATION FUSE 120/240 VAC BRIDGE RECTIFIER BATTERY STACK GND VO VS VP 1 8 2 4 2 8 4 6 STEPDOWN TRANSFORMER R3 R2 R1 C1 D1 + - ICL7673 BATTERY BACK-UP ICL7663 REGULATOR POWER FAIL DETECTOR MICROPROCESSOR VOLATILE RAM INTERRUPT SIGNAL ICL7673 BACKUP CIRCUIT +5V MAIN POWER VO VP VS + - ICL7673 |
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