ESP8266-DEV PCB: Issues With Third Voltage Divider and Pololu S10V2F12 SHDN Control

I’m using an ESP8266-DEV to measure battery voltage and control some LED lights.

The first 2 voltage dividers are used to get the voltage bellow 1V, required by the ADC GPIO – it is working fine.

The third voltage divider lower the voltage bellow 0.4V, in order to power down the Pololu S10V2F12 12V step-up, by keeping the SHDN pin powered during sleep cycles of the ESP.
By setting GPIO12 on HIGH, the 12V module activates, and through IRL510 MOSFET I can control the LED light.

In my prototype the circuit works fine, but on my PCB design the third divider either not give me any voltage, or give me the same voltage as input, and the MOSFET is behaving glitchy – every couple of seconds it turn off and on. I’ve even managed to burn one ESP...

I’ve measure all wirings and connections, I do not have any shorts or wrong voltages... What am I missing? What else can I measure to identify the source of the problem?

Hi Andy Fe,

I think it is the problem of your pcb track design some of the tracks may be so thin
that they will not be able to supply the sufficient voltage and current as per the circuit requirement .Check the mosfet gate voltage it should be kept at 2.5v for safeOperation of the system. Short the tracks of the mosfet gate, source and drainOne by one using a small wire, also check the gate resistor, short the track of the Out put of the regulator ic with a wire.
Pl entre my score.

Yep, the glitches of the mosfet came from poor PCB traces. Thank you for pointing me in the right direction