Split Rail Linear Power Supply

The positive supply rail is created from a standard off the shelfcoupled inductor from coilcraft.

Split rail linear power supply.

For step by step details see the application report creating a split rail power supply with a wide input voltage buck regulator charge pumps are a popular and easy way of inverting positive rails. Power supplies are available at mouser electronics from industry leading manufacturers mouser is an authorized distributor for many power supply manufacturers including artesyn bel power cosel cui inc delta mean well phoenix contact recom tdk lambda traco power vicor xp power more. The input supply voltage range is suitable for use with lithium ion batteries or from a fixed 3 3 v supply. Splitting a rail using the voltage reference will often mean compromising a bit on the symmetry of the split for example if a 3v3 rail is to be split then the closest would be to use the 1 8v output reference which gives a 1 8 1 5v asymmetrical supply.

The tps65133 is designed to supply any system requiring 5 0 v supply rails. I build up a simple low voltage supply to setup the framework for the l. Open in new find other lcd oled display power drivers description. In a split voltage power supply application the analog circuit is connected between the positive voltage rail and the negative voltage rail.

This results in the load current of both regulators to be equal in magnitude. This document outlines a step by stepmethod for designing the split rail power supply. Figure 2 is a plot of the input current versus the output current for the circuit in figure 1. The fly buck method is a more complex technique.

Each output can supply up to 250 ma of output current. Only the ref3318 is available with a 1 8v output so it could be used.