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DS2720AU Datasheet(PDF) 7 Page - Dallas Semiconductor |
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DS2720AU Datasheet(HTML) 7 Page - Dallas Semiconductor |
7 / 21 page DS2720 7 of 21 Figure 3. Li+ PROTECTION CIRCUITRY EXAMPLE WAVEFORMS Notes: IOC = Current that produces a voltage drop across FETs equal to VOC threshold. ISC = Current drawn from the battery during short-circuit event. (Collapses the cell terminal voltage to VSC.) Above example assumes FET on-resistance values such that the overcurrent threshold, VOC, is reached before the short-circuit threshold, VSC. POWER MODE VOV VCE VUV VDD VPLS - VDD CC DC -VOC 0 tSCD tOCD tUVD VOHCP VOHCP ACTIVE VOLCC VOLDC SLEEP tOVD OVER- CURRENT OR SHORT TEST ACTIVE INACTIVE tUVD VSC ICELL CHARGE DISCHARGE -ISC -IOC 0 VCH tUVD tUVD RECOVERY CHARGED THROUGH ENABLED DISABLED RECOVERY CHARGE tON tON tON SHORT-CIRCUIT EVENT UNDERVOLTAGE EVENT OVERVOLTAGE EVENT OVERCURRENT EVENT UNDERVOLTAGE EVENT SEVERE DEPLETION |
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