I am in the process of designing an input protection circuit for my smart load switch (TPS27SA08)
This circuit is intended to provide reverse polarity protection and overvoltage protection:
The input voltage of the circuit is 12V, 8A is the maximum current.
D1 is a bidirectional TVS diode with 17.1V maximum clamping voltage at 10A and 12V working voltage
Q1 is a P CHannel MOSFET with Vgs maximum voltage +- 20V and Vds of -55V.
The smart load switch voltage input goes from 8-36V
I have 2 questions:
- Do I need to add a fast blow fuse at input for an overcurrent situation or with the tvs is enough?
- Will the MOSFET survive an overcurrent and overvoltage scenario? Keeping in mind the maximum clamp voltage of the TVS and the maximum voltage of Vgs of the MOSFET.