I am new to electronic circuit design. My current project is to monitor biasing voltage for under/ over voltage using IC from TI: TPS3700. If any of the under/over voltage occurs I will need it to drive a relay coil to cut off the main circuit supply.
I have studied the TPS3700 datasheet and found out its output pin is open-drain type and able to sink around 40mA of current. Could I connect NEC UA2 relay coil (pin8) to one of the TPS3700 output pin. This relay has coil current around 20mA and will have separate 5V supply connect to its pin1. My idea is to sink the relay coil current via the TPS3700 directly.
Another concern is will the relay switching noise coupled into the biasing voltage which is being monitored?
datasheet for TPS3700 and NEC UA2 relay http://www.ti.com/lit/ds/symlink/tps3700.pdf https://www.nec-tokin.com/english/product/pdf_dl/mini_data/relay_ua2_ub2_e.pdf