Can I used the power supply is large voltage to prevent the drop voltage when loaded?

Thread Starter

anhnha

Joined Apr 19, 2012
881
Hi there,
In my circuit the standard is 5V power supply.But there is a problem that when i used 5V as standard then when the load is connected the voltage is droped to 3.78V.Can I use the higher power supply to offset this?
 
Last edited:

MrChips

Joined Oct 2, 2009
21,618
You need to examine the requirements of the load. How much current at 5v does it require? Then match the power supply with the load. Get a power supply that delivers about 3v more than what is required. In this case use a power supply that is rated at 8 or 9v at the maximum current required.

To help even further, you can use a low drop-out regulator.

Edit: I assume that there is already a 5v regulator on board.
 
Last edited:

praondevou

Joined Jul 9, 2011
2,942
Just make sure you don't use the power supply with the higher voltage on a lighter load specified also for 5V. The power supply's voltage drop will be less with a lighter load, possibly damaging the load.

What you want to do works fine with a constant load.
 
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