simple -5V power supply

Status
Not open for further replies.
B

bittware

Full Member level 4
Joined
Apr 3, 2004
Messages
208
Helped
1
Reputation
2
Reaction score
1
Trophy points
1,296
Activity points
1,986
Hello experts,
In our application, we need +/-5V power supply rails. For -5V power supply, I just use +5V regulator positive output as the load GND and use +5V regulator GND as the load -5V power supply. Don't you think this is the most simple solution for -5V power supply? If not, could you tell why this is not feasible?
Thanks in advance.
 

You can only do it if you have two independent (isolated) unregulated voltages - then you can connect one 5V voltage regulator output as (+5V), it's GND and the second's regulator output as "new" 0V and the second regulator"s GND as (-5V), so from that point of view I can't find this solution to be THE SIMPLEST ..
Simpler solution is when you have positive voltage regulator sitting on the (+) rail and negative voltage regulator sitting on the (-) rail and both sharing one common 0V .. see picture below ..

Regards,
IanP
 

Hi
This is not a good practice because you dont have a solid ground, the most simple way is to use µa7805 (+ 5 v regulator ) and µa7905 ( - 5v regulator ) , this is optimum.
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…