Flyback power supply design

tor

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

Regards

Klaus

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.

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).

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

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

For other SMPS stuff check here.

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...

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