A4490 circuit design problem

Thread Starter

Alexandru Anghel 1

Joined Aug 30, 2018
Hy all,

I am having a hard time locating the problem.
My A4490 doesn't output. IT have 3 outputs, where 2 of them are supposed to output 5V.
The 3rd output is variable depending on R11 (potentiometer) somewhere between 1.8V to 3.6V
The first 2 only outputs 1.5V.
The 1V8_3V6 does output the voltage by setting R11but ONLY after I play with the power supply switching it on and off fast enough.
If I do this very slowly it doesn't enable this output.

I added a picture of the schematic for you guys to see. A4490_test_schematic.png