Published:2009/7/23 22:34:00 Author:Jessie | From:SeekIC
In this circuit, power to the IC is taken from the output voltage by connecting the +Vs pin and the top of R1 to the output voltage. Notice that the initial battery voltage must be greater than 3.0 V when the circuit is energized. If not, there will not be enough voltage at pin 5 to start the IC. The big advantage of this circuit is the ability to operate down to a discharged battery voltage of 1.0 V.The value of C1 is determined, as described for Fig. 4-2.
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