How To Make A Split Rail Power Supply

So i decided to make a spit supply from a 24vdc supply.

How to make a split rail power supply.

This approach can be used when bipolar supplies are required from a single supply input provided the load currents are modest. Easy split voltage power supply. The positive supply rail is created from a standard off the shelfcoupled inductor from coilcraft 5. Dual power supply rails are very useful when working with op amps as this type of design provides greater stability.

In this post i ll describe three ways to split a single supply rail into a bipolar voltage rail. I need the split supply for excitation voltage which i mentioned in my previous question. The power supply rail used for most analog circuits still requires a split power rail. This article surveys several discrete and module based negative output and split rail positive and negative output solutions for powering split rail amplifiers analog sensors data converters and audio amplifiers.

The negative voltage rail is connected to the exposed pad of this ltc3388 3 and must be isolated from. I want to obtain 12vdc supply from a 24vdc supply where the total load will driver 100ma max. This document outlines a step by stepmethod for designing the split rail power supply. Building a split rail power supply for op amps is very simple and requires a transformer with a centre tap on the secondary side.

The split rail power supply uses a wide input voltage step downregulator as an inverting power supply to create the negative supply rail. If a supply of twice the required minimum voltage is available another option is to simply split the supply and create a virtual ground either using an op amp fed from a pair of matched resistors as voltage divider or using a dedicated rail splitter part such as the texas instruments tle2426. The positive voltage rail is created by configuring one ltc3388 3 in its standard buck topology while the negative voltage rail is created with a second ltc3388 3 by grounding the v out connection and using the gnd pin as the negative voltage rail. I have some many lm7812 lm7912 or equivalent.

I tried using two power supplies but one of them blew up. This article shows a generalised circuit which you could adopt for 5 v 12 v and 15 v designs. However recent advancements in dc dc power modules allow straightforward implementation of a split rail power solution.