L
Leon Heller
- Jan 1, 1970
- 0
I need to convert a supply voltage between 36V and 48V to 3.3V as
efficiently as possible. The 3.3V system will probably be using an MSP430
and hence will take very little current. What I'm proposing to use is a
simple two-transistor astable oscillator powered directly from the supply
with a step down toroidal transformer (centre-tapped primary) feeding a
rectifier and smoothing capacitor, followed by a 3.3V LDO. Is there a better
way to do it? Cost/size need to be as low/small as possible.
Thanks for any suggestions.
Leon
efficiently as possible. The 3.3V system will probably be using an MSP430
and hence will take very little current. What I'm proposing to use is a
simple two-transistor astable oscillator powered directly from the supply
with a step down toroidal transformer (centre-tapped primary) feeding a
rectifier and smoothing capacitor, followed by a 3.3V LDO. Is there a better
way to do it? Cost/size need to be as low/small as possible.
Thanks for any suggestions.
Leon