I have a solar system (will have) I need both a +5v (1-1.5A) and +12v (2-3A) supply for some circuits, the input voltage will be between 10v-17v I therefore need some way to get 12v and 5v efficiently I dont want to use 7805's or 7812's as they waste so much.
So having read about I am left with SEPIC and SMPS
MAX649 or LM2937 seem to be talked about alot for 5v does anyone have a schematic for the best one?
What should I use for 12v? would it be better to increase the 12v load from 2-3A to 4A and feed the 5v regulator from that?
Are SEPICs better? what is the difference?
I don't know if ripple and all that other stuff is a problem I am supplying a thermostat, light sensor, volt / amp meter, LED array, fan and 15w heater.
multi-output Flyback SMPS, I suppose SEPIC is possible but I'm not sure about the feasibility of some of the components in it, specifically the high frequency capacitor in it.
There are some car ATX-compliant SM power supplies that you can probably directly use that have good efficiency.
Disclaimer: I'm not affiliated with this site, it just so happened to be the first one I saw on google:
Sepic is mearly another derivative of a basic SMPS design. Make is not going to be nearly as useful as finding a good core chip and designing around it.
I am happt to use a good core chip if I knew which that was and build around it as you say.
I found this while looking about the net
**broken link removed**
I was thinking I could chop out the -12v section as it is not required, It would be nice to increase output current for added overhead. Ignore the 5v section as well, it is not required as I was looking at the MAX649 for that, I need about 200mA min but would like overhead again.
I am happt to use a good core chip if I knew which that was and build around it as you say.
I found this while looking about the net
**broken link removed**
I was thinking I could chop out the -12v section as it is not required, It would be nice to increase output current for added overhead. Ignore the 5v section as well, it is not required as I was looking at the MAX649 for that, I need about 200mA min but would like overhead again.
From wiki the buck-boost is a step-up and step-down converter. Is that not the posted schematic above? it accepts a wide supply voltage. and is intended for a computer so I'm guessing its stable enough to use without having to look into harmonics and ripple and all that stuff I dont understand
I dont really know what im looking for as a controller IC, I always used 7805 etc This is what im asking for advice on.