On 19/04/2011 12:11, Michael Watterson wrote:
> Multiwinding SMPSU
>
> sec1 3.3V. Feedback Regulate on this, use this with linear reg to get
> 1.5V. Possibly use centre tap winding and two diodes. Don't use 4 diode
> bridge as the losses are double.
> sec2 +6V and -6V approx via two diodes and a pair of LDO regulators. If
> you want a +5V LDO reg for -5V, then have a second identical winding.
>
> Ensure SMPSU inverter works from 2.5V to 7V input.
>
> If current consumption is low, you could generate the +5V and -5V from
> the winding feeding 3.3V rectifier(s) via tripler and pair of LDO
> regulators, or if load is constant and reasonable tolerance allowed just
> use doubler as voltage drop is over 1V. Possibly add an extra series diod=
e.
>
>

Thanks, I will consider this too.

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