Hi All,
The system is for an Industrial device ( Automotive factory ). Also we need GND continuity and the option to use PMOS or some Ideal diode controller with NMOS, but i would like to stick to PMOS.
If you take that the max current is 2.5A then the max dissipation on P-mos is ~2.5*2.5*4.8mOhm = 30mW.
Currently i'm using the attached schematic 1. but i would like also to ESD protect the PMOS.
1)
So i would like to that you look at schematic 2,3,4,5 and comment which one would you preferer and why?
Schematic 2) Bipolar TVS before PMOS
Schematic 3) Unipolar TVS before PMOS
Schematic 4) Back-to-Back TVS before PMOS - is there any advantage over Bipolar TVS before PMOS?
Schematic 5) Bipolar TVS before PMOS and Unipolar After PMOS
2)
Also the Bipolar (SMCJ24CA) and Unipolar (SMCJ24A) TVS from Bourns
https://hr.mouser.com/datasheet/2/54/SMCJ-778393.pdfhave max clamping voltage of 50V ( for 8/20 pulse) and 39V (for 10/ 1000 pulse) , is the selection of PMOS ok regarding to its VDS maximum ? I'm assuming Vd and Vs are on same potential in a ESD event or am i wrong?
3)
Regarding the LED ofr reverse polarity indication, what do you think of the schematic below ( LED Schematic), the connection is after the fuse.
Br,
d.