I am measuring 5.4V from the NCV5501
Not for higher current continous overvoltage signals.This little mess has lead me to realize input protection using diodes that clamp to the power rail of a linear regulator is probably not a good idea.
For sure you can. But be aware of some limits:Can I just add a zener diode on the power rail?
--> show schematics you refer to.... (I can´t remember circuits, where protection-zeners are used with a resistor to the power supply)Most schematics I see for zener protection have a resistor between the power rail and the zener diode, is this necessary or will the LDO behave as a limiting resistor in this situation?
I usually don´t do this. An exception is a power supply for an active line terminiation.Would it be better to source a regulator capable of sinking current instead?
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