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RE: Increase L in pi network

Posted by Eli Duttman (A) on September 22, 2017 at 02:14:31

In Reply to: Increase L in pi network posted by Sidewinder on September 22, 2017 at 00:15:20:

As this data sheet indicates, you could be pressing your luck with a 47 μF. part in the 1st position of the PSU filter.

IF the DCR of the 2 inductors is the same, a larger inductance yields less ripple, without changing the rail voltage.

If a "swinging" choke is on hand, I would not use it in a П section filter, as it's inductance varies with the current being passed. A "normal" choke intended for critical current duty will be fine. Inductors in choke I/P filters are subjected to much greater strain than those in cap. I/P filters and are constructed accordingly. If an inductor not specifically rated for choke I/P service is to be employed that way, substantial derating of its current handling capability is necessary.


Eli D.

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