Can someone please help me in the analysis of this arduino board power supply works
To my understanding,
- In the presence of DC power through the DC jac, Dc voltage is fed to the MC33269 regulator to generate +5V. This same voltage is fed through R10/R11 divider to +terminal of the comparator, while the 3.3v OUTPUT of the FT232RL is fed to the -terminal. the positive differential result drives the output high. However, i'm not sure the effect on the second comparator and the FET
- When USB connector is used to power the board, I'm not sure what happens.