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Flyback power supply design

Most of te semiconductor houses now have online or downloadable circuit cimulators and tools. For switch mode power supplies Linear technology is a well known suplier and they have a LT switcher tool. so may as well start there.

The key to all switchmode is sizing the inductor for correct value at full current load (current de-magnetizes the coil, saturation effets) and then sizing the capacitors to limit ripple. The rest is finese. You wil also nee a good supply of schottky diodes tha also handle peakswitch mode currents.

If you need help for a commmecial product let me now and our group will put together a professinal supply and source the materials you neeed along with manufatring acument.

IN any event have fun and good luck

Marc

Reply to
LVMarc
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tor

Look at the TI site (Formerly Unitrode application notes and papers give great info)

Regards

Klaus

Reply to
Klaus Kragelund

Hi

Do you know any sites, where I can find info how properly design a low power (about 5W) flyback power supply? I add that I'm beginning with switchmode power supplies.

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Best regards,
Marcin Osiniak
Reply to
Marcin Osiniak

Firs of all, thanks for quick answer...

Power supply will be the part of biger student project so I don't want to use a specialistic chip in design. I was thinking about simple PWM generator with comparator (like UC3842).

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Best regards,
Marcin Osiniak
Reply to
Marcin Osiniak

I posted an inverting switcher, essentially a flyback, schematic to a.b.s.e. a week or so ago. I like this design because it is sort of discrete. Something similar could be done with all transistors, no IC's at all, without much difficulty. The IC I'm using is just a gate driver with hysteresis, not intentionally a switching controller.

The really interesting issue is control loop stability at various inputs and loads, especially in continuous mode. My struggle with capacitor esr and such has been a running thing here.

John

Reply to
John Larkin

The app note on the UC384X has a good design example on a multi output FlyBack.

For other SMPS stuff check here.

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Reply to
Hammy

BUT. *ALL* of them are totally useless for (truly) high voltage output (say 400V to 40,000V). These daze, "high" voltage is anything over 30V...

Reply to
Robert Baer

Rob,

I have never tried the web based tools for anyhting but a qucik look and only at becnch top levels ...a could of f\vp;ts.. latley 3 volts is the high voltage and things go down from thier! I did ot relaize the web tols had voltage imts.

for srius simulation I waould use pencil and papaer along with a spice for the core elements, there are no similar voltage l

Marcimts there

Reply to
LVMarc

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