To safely operate such a battery, the discharge current rate and battery voltage level must be monitored. Undervoltage protection is crucial when using lithium-ion batteries because if the battery is discharged below its rated value, the battery will become damaged and potentially pose a safety hazard.
In addition to undervoltage protection, it is important to ensure that the battery is discharging a safe current value. Combining undervoltage protection and overcurrent protection will ensure safe operation of the 48-V battery. For this design, a 48-V, 20-Ah lithium-ion battery was selected.
The undervoltage condition for this design is when the battery voltage, VBATT, is 10-V. The voltage seen at the pin of the comparator must not exceed 5.7-V as specified in the Recommended Operating Condition table of the TLV902x and TLV903x High-Precision Dual and Quad Comparators Data Sheet.
To determine how much the battery voltage should be reduced to stay below the 5.7-V input voltage limit, consider the maximum battery voltage of 48-V. At this value, the voltage must be divided down by a factor of 8.42. For this example, we round up to 9 to be safe. Next, use the external hysteresis tool posted on this E2E thread.
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