Steven Falivene asked 3 years ago
I have a power supply that is connected to small solar panel with a diode. The power fluctuates between 5 to 5.8 v and I want to regulate it down to 5 to 5.3v. I recognise that many LDOs have a 0.2v drop out, so as soon as the voltage gets below 5.2 v then the voltage supply cuts out. So I want a circuit that bypasses the LDO as soon as the voltage gets to about 5.3. I am thinking of using a P mofset to open a bypass when the LDO stops supplying (diode in between the power supply and mofset gate) , any better ideas of a simple circuit?
Sara Santos Staff answered 3 years ago
Hi.
First, before I give you any advice, I have to admit that circuits in general are not really my expertise.
Using a MOSFET seems like a good idea. I found a discussion that seems to be similar to what you’re looking for: https://www.eevblog.com/forum/projects/voltage-regulator-bypass-circuit/
If you need more specific advice about circuits, I’m not really the best person to answer.
I’m sorry that I can’t help much.
Regards,
Sara