protection circuit with Zener 5,6V

Submitted by Marcio on Thu, 10/19/2017 - 19:58

I have a circuit that has a 5V input, but i need make sure that when the voltage reaches 6 or 7V or more, the circuit keeps with 5,6 V! I already tried to put one Zener Diode with a resistance 1k attached to 5V line to GND, but the voltage reach more of 5,6V in my microcontroller.

any ideas how to solve this problem?

Thank you

Hi Marcio,

Using a Zener should have solved the issue, also note that zener is a low current regulator device. If zener did not work for you try using a Potential divider if our output load current is less.

Also why havent you used a Voltage regulator like 7805?

Elaborating more on the source of voltage and where you are using them would have helped me to do more justice to this question

  Joined August 16, 2016      998
Tuesday at 12:29 AM

Frist up all check your Zener diode rating, it may have limit voltage to 5.6 V

 

  Joined January 19, 2018      1
Friday at 09:15 PM

Hi marco,

Usually the voltage of a zener won't match in real live values. You should use lower than 5V, like 4.7V but you can even go lower as the microcontroller will still reed a one at say 3V.

  Joined February 20, 2018      2
Tuesday at 05:14 PM