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How to calculate UC3842 components?

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T3sl4co1l:
Yeah, the only downside is using somewhat larger / more robust / more qty of electrolytics than you'd need otherwise, but they simply aren't very big to begin with (a buck or two worth), so it's not a big deal.

Tim

technix:

--- Quote from: T3sl4co1l on May 07, 2016, 06:22:41 am ---Yeah, the only downside is using somewhat larger / more robust / more qty of electrolytics than you'd need otherwise, but they simply aren't very big to begin with (a buck or two worth), so it's not a big deal.

Tim

--- End quote ---

Let's just say except one dubious cap kit I bought long time ago, all through hole high capacitance electrolytes I have share a single brand: Nippon Chemi-Con. No worries here (and I just updated my PCB to use those Nippon Chemi-con ones despite preferring the surface-mount caps.)

I even got a few Nippon Chemi-con electrolytics for my mains filter cap. And that is NOT cheap.

T3sl4co1l:
Brand doesn't matter, ratings matter. You can't use a "general purpose" (high ESR, 2000 hr 85C) part here, for example.

You don't need to use aluminum polymer here.  That would be overboard, no matter whose brand you get.

That leaves the lower ESR series, suitable for switching, and preferably with higher life.  That still leaves a lot of choice, even from a single manufacturer.  And it may be helpful to use two in parallel; there's nothing wrong with that.

Tim

technix:

--- Quote from: T3sl4co1l on May 07, 2016, 07:09:22 pm ---Brand doesn't matter, ratings matter. You can't use a "general purpose" (high ESR, 2000 hr 85C) part here, for example.

You don't need to use aluminum polymer here.  That would be overboard, no matter whose brand you get.

That leaves the lower ESR series, suitable for switching, and preferably with higher life.  That still leaves a lot of choice, even from a single manufacturer.  And it may be helpful to use two in parallel; there's nothing wrong with that.

Tim

--- End quote ---

I don't even have any general purpose aluminum electrolytic caps except that dubious through-hole cap kit I bought long ago which tops out at 470uF. I haven't used a single through hole electrolytic below 1mF in my design from the get-go (I use chip tantalums there)

underwol2:
estoy comenzando a estudiar fuentes y me gusta estudiar y practicar para entender  y aprender casual mente tengo un cargador de baterías que me llego le faltaba una pieza no en contre el diagrama  o schematic
me encontre de tanto buscar por Internet  un archivo en español sobre el diseño con este integrado uc3842
documento en pdf
DISEÑO Y CONSTRUCCIÓN DE UNA FUENTE CONMUTADA pdf
al mirar los cálculos o formulas que a estado haciendo en la pagina 59 donde se esta despejando C1 al repetir la formula como la muestra no logro el resultado no se que pasos uso para hacer ese cálculo o formula para despejar C1 y no se como se saco ese valor  C1 = 22uf
podrían hacerme el favor y me ayudan  como es que se despeja esa formula hasta que se saca el valor de de C1
gracias desde colombia

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