Split Rail Power Supply

This results in the load current of both regulators to be equal in magnitude.

Split rail power 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. Dual power supply rails are very useful when working with op amps as this type of design provides greater stability. This topology offers an isolated voltage supply. Only the ref3318 is available with a 1 8v output so it could be used.

In a split voltage power supply application the analog circuit is connected between the positive voltage rail and the negative voltage rail. Basic calculation of an inverting buck boost power stage rev. Another popular inductive split rail solution is a fly buck topology which is a step down synchronous buck converter with a coupled inductor in the feedback loop. Figure 2 is a plot of the input current versus the output current for the circuit in figure 1.

Tps65133 5 v 250 ma dual output power supply datasheet rev. The positive supply rail is created from a standard off the shelfcoupled inductor from coilcraft. The split rail power supply uses a wide input voltage step downregulator as an inverting power supply to create the negative supply rail. The top three ways to split a voltage rail to a.

The power supply rail used for most analog circuits still requires a split power rail.