The ideal diode controllers have all the features necessary to implement an efficient and fast reverse polarity protection circuit. They also include a load disconnect function in case of overvoltage and undervoltage events. With an 80V capability, they are suitable for all 12V and 24V batteries.
This application note explores the principles and advantages of ORing and power multiplexing using ideal diode controllers, examines various circuit topologies, and addresses the key design challenges and mitigation strategies for automotive power systems.
The ideal diode controller is an efficient solution to providing input reverse polarity protection. Choosing the right MOSFET to go with the ideal diode controller is just as important and, by following some simple steps, it can be quite easy.
Each module within a vehicle will tend to have both reverse battery polarity protection (shown here as a diode, but often implemented as a MOSFET) and a TVS device to protect that module from transients.
The varactor diode is a device that is processed so to capitalise on the properties of the depletion layer of a P-N diode. Under reverse bias, the carriers in each region (holes in the P type and electrons in the N type) move away from the junction, leaving an area that is depleted of carriers.
