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Simple circuit disconnects load from battery

http://www.edn.com/archives/1996/031496/06di5.htm

 



To prevent battery damage, the circuit in Figure 1 disconnects the load at a predetermined level of load voltage. This load voltage, VTRIP, is closely proportional to the battery voltage. R1 and R2 determine the level of VTRIP that corresponds to voltage of 1.15V at pin 3 of IC1. A voltage of 1.15V at pin 3 of IC1 causes the internal comparator to trip. Thus, VTRIP=1.15(R1+R2)/R1. visit page.