J
Jon Slaughter
- Jan 1, 1970
- 0
suppose I have a ps that has about 35VDC after filtering. I'm trying to
determine what minimum filtering caps I can get away with and still have
good regulation for ic's.
I know that VR = I/f/C is my P2P voltage ripple size.
Now can I just take that and subtract it from my total voltage and then make
sure my regulator is a few volts below that or will it sill cause problems?
e.g., I have 35VDC non-filtered. If say I use 3300uf cap for smoothing that
gives me a ripple of about 5V at max 2A. This means I have a minimum voltage
of ~30VDC. If I keep my regulator below about 25 volts then will I be fine
and have good regulation? or do I really need to add the extra capacitance
to improve regulation signficantly?
I would imagine that the regulator can easily keep up with the ripple and I
just need to use enough filtering to keep the minimum above the max voltage
+ headroom that I need and that there is no need to waste the extra
capcaitance since it won't really be used? (obviously will probably double
it just in case)
e.g., it seems for the case above that if I have atleast 3300uf that I'll
have approximately the same regulation as anything greater than 3300uf?
Just trying to save some caps
Thanks,
Jon
determine what minimum filtering caps I can get away with and still have
good regulation for ic's.
I know that VR = I/f/C is my P2P voltage ripple size.
Now can I just take that and subtract it from my total voltage and then make
sure my regulator is a few volts below that or will it sill cause problems?
e.g., I have 35VDC non-filtered. If say I use 3300uf cap for smoothing that
gives me a ripple of about 5V at max 2A. This means I have a minimum voltage
of ~30VDC. If I keep my regulator below about 25 volts then will I be fine
and have good regulation? or do I really need to add the extra capacitance
to improve regulation signficantly?
I would imagine that the regulator can easily keep up with the ripple and I
just need to use enough filtering to keep the minimum above the max voltage
+ headroom that I need and that there is no need to waste the extra
capcaitance since it won't really be used? (obviously will probably double
it just in case)
e.g., it seems for the case above that if I have atleast 3300uf that I'll
have approximately the same regulation as anything greater than 3300uf?
Just trying to save some caps
Thanks,
Jon