Hi
I have a 12v supply in my circuit, I am using a LM2596 3~40V DC-DC Buck Adjustable Converter to step the incoming voltage to 6 volts
From there I am using an AMS1177 3.3 voltage converter to supply the right voltage to my Esp32 module.
Recently I come across to a sad situation... From one mistake I have done shortage to electrolytic capacitor in the output of the voltage regulator I fried the voltage regulator (didn't notice ii at first) and as a result I fried my Esp32 module.
I solder a new Esp32 and fried it also and then I notice that I had bad voltage regulator.
If use a zener diode in the input of my MCU will do the trick to protect is from a future similar situation of a bad voltage regulate?
Should I consider an other way to protect my circuit?
Thanks in advance.
Ps : I am posting this from my mobile phone, if you think that could help posting a schematic of the connection be free to tell me in order to draw one and upload it
AMS1117 is an LDO, and for it to work at full power, it is enough that the input voltage is 1.3 volts higher than the output voltage. The ESP32 has a large peak current especially when its wireless capabilities are used. A large voltage difference along with high consumption gives a lot of heat for the regulator to dissipate and if it is in a SOT-223 package you may have problems. Can't you just set up an LM2596 or similar converter to 3.3 volts and avoid the AMC1117 altogether?
in my circuit i am using and a 5v components and that is why i can adjust my Lm2596 module for 3.3v only
about the burst / consumption at bluetooth / wifi connections never had problem in the past in other circuits i made.
i am solving this problem by adding a 470uf electrolytic capacitor to the output of the ams1117 3.3v regulator
So in my new design i will add a fuse and a zener 3.3v after the capacitor for MCU protection.
