Transformer to the Power Supply

[orionsbelt]

Hello,

I have just found a voltage regulator, LM2735, which could be a possible solution to my power supply (see the picture). But I am having hard time finding a proper transformer to the power supply. My output voltage should be ±10VDC. The input voltage is +5VDC.

A transformer with a turn ratio of 1:5:5 should be good for this purpose, I think. But I am not sure which transformer type I should use (for example, audio & signal transformer, current transformer, power transformer....etc..).

It would be great if you also could suggest some names of manufacturer.

Thanks!

//OB

 

[BradtheRad]

Your schematic appears to be a step-up flyback, with a tapped transformer producing a bipolar supply.

A simulation is helpful to demonstrate what waveforms result from various combinations of values.

In constructing a flyback, the goal is to design the transformer so it performs as you require, with a 50 percent duty cycle (or thereabouts).

You probably will have a bit of leeway to change the duty cycle one way or the other.



My primary value is not necessarily the correct one in all situations. If your load draws more Amperes than my schematic shows, then you can reduce the primary's inductance.