Split Rail Linear Power Supply

The tps65133 is designed to supply any system requiring 5 0 v supply rails.

Split rail linear power supply.

I thought it would be interesting to do a theory video on linear power supply design. This results in the load current of both regulators to be equal in magnitude. Figure 2 is a plot of the input current versus the output current for the circuit in figure 1. The input supply voltage range is suitable for use with lithium ion batteries or from a fixed 3 3 v supply.

In a split voltage power supply application the analog circuit is connected between the positive voltage rail and the negative voltage rail. The split rail power supply uses a wide input voltage step downregulator as an inverting power supply to create the negative supply rail. The positive supply rail is created from a standard off the shelfcoupled inductor from coilcraft. 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.

White vinyl 3 rail diamond fence panel with 3 rails post and cap. I build up a simple low voltage supply to setup the framework for the l. This document outlines a step by stepmethod for designing the split rail power supply. 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.

Each output can supply up to 250 ma of output current. The fly buck method is a more complex technique.