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3

Actually I think that none of the components you've circled in all the schematics are responsible for the reverse voltage protection at all (as you correctly pointed this out yourself in all three cases: "diode D1 blocks excessive positive voltage from the input supply", "R5 to block excessive currents from passing to the GATE pin in the event of excessive ...


3

An ideal diode would be the best solution with a suitable low RdsOn FET. D4185 RDS(ON)< 20mΩ(VGS= -4.5V) $3.19 simulate this circuit – Schematic created using CircuitLab


2

the -100V is a 5A inductive pulse, whereas DC survival spec is only -30V +50V. The reason for this -30V is in case a alternator charged 24V vehicle is used to jumper cable another with the cables reversed. (momentarily) The 2nd simple circuit is missing parts and will not survive all the test conditions for ISO-16750-2 tests 1 thru 5b . Keep this date in ...


1

How to block reverse current from battery to charger output? I assume here that you are already using the recommended layout of the LTC4416 AND that V1 is the AC-DC supply AND that V2 is the battery supply for your Power Path Switch. Your Power Path Switch circuit will look something like this: Since V1 is also used to drive the Charger DC-DC convertor ...


1

The case for surge protection is disconnection of the battery +ve terminal with an inductive load that results in a negative spike. The Gate voltage limit is due to the Schottky diode protection built in that cannot tolerate more than 1 mA or so external negative input at that voltage in order to protect the CMOS driver against the common SCR substrate ...


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