i've designed this schematic using a simple buck converter (LM2596) for my board that powers up some leds and board peripherals.
The board will work at 5V with maximum current draw of 2.5A.
Now, as you can see in the schematic, i've already added a reverse voltage protection using SS34 (D6) diode (Datasheet here), what i want to implement is the overvoltage protection, i want that if there is a voltage input of more than 15V the external peripheral (marked with netflag +12V-POE) will not start blowing up (as the external peripheral maximum voltage rating is 15V).
What i can use? a Zener (in this case what part you recommend) or something different?