I am with EE background and recently I had question in interview regarding “How to sense/know when device needs power?”.
So, basically I had a good interview on different topics and one of them was MOSFET.
I answered mostly all questions properly until this question comes up.
Interviewer asked me: “If you are making power supply for a laptop and when laptop goes in to sleep that time your supply should not provide full power (may be negligible). And when you on the laptop or started working on it at that time your supply should provide required power.”
How can you design circuit which sense/detects when device needs power?
Can any one of you help me on this? I would really appreciated any input.