I am a beginner in circuit design and I have been trying to understand the purpose of the Q2A and Q2B transistors in the above power circuit.
Here is what I am able to understand so far.
- There are two power sources, +5V and +5V_USB.
- When +5V is present, the Q2B turns on which turns of the P-Channel Q1 and vice versa
- This makes sure that only one source is available at the same time?