SNOAA65 December 2020 TLV9022
For this design, a 48-V, 20-Ah lithium-ion battery was selected. Monitoring a 48-V lithium ion battery can be achieved using the TLV9022 device in combination with the TL431 shunt reference. The TLV9022 is a dual-channel, open-drain comparator that will be used to implement overcurrent and undervoltage protection. This comparator was selected for its low-input offset voltage and fast response time. Additionally, this comparator has fault-tolerant inputs that can go up to 6V without damage. The design process will be broken down into three main sections: Voltage Regulation, Overcurrent Protection, and Undervoltage Protection with Hysteresis. This design has design parameters and desired outputs shown in the following table.
System Supply | Undervoltage Limit | Undervoltage Reset | Overcurrent Limit | Comparator Output Status | ||
---|---|---|---|---|---|---|
Typical | VUV | VRES | IOC | Overcurrent | Undervoltage | Normal Operation |
29 V | 10 V | 12 V | 10 A | CH1-HIGH | CH1-LOW | CH1-HIGH |
CH2-LOW | CH2-HIGH | CH2-HIGH |