We are designing a low voltage (Max 19VDC) lighting system that uses mains primary power and battery backup. Circuit design would follow figure 3 of the typical applications diagrams.
One of the planned features of the system is battery monitoring and automatic disconnect to protect the battery. The plan is to provide an MCU generated HIGH to digital pin CTL turning off the MOSFET and isolating the battery. This will also remove power to the MCU (total battery isolation due mains power still failed and low battery condition). Once this happens can we expect the MOSFET to stay off or will the system enter a continuous OFF/ON cycle ?