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Re: gEDA-user: Switching regulator question

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Subject: Re: gEDA-user: Switching regulator question
From: DJ Delorie <dj@xxxxxxxxxxx>
Date: Mon, 18 Jun 2007 14:45:25 -0400
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In-reply-to: <20070618183341.GL956@xxxxxxxxxxxxxxxxxxxxxxxxx> (message from Randall Nortman on Mon, 18 Jun 2007 14:33:41 -0400)
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> I looked briefly at LC filters to handle 120Hz ripple.  Requires some
> pretty large, expensive inductors if I'm not mistaken.  Seems cheaper
> in both board space and money to have more capacitance.

Are you trying to filter the 120Hz ripple, or just block the switcher
ripple?  Using a small inductor between the bulk caps (120Hz side) and
a tantalum (switcher freq) "bypass" cap might help protect the bulk
caps from too much high frequency ripple current.

/me wonders if a diode in series with that inductor would help prevent
resonance?


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References:
- gEDA-user: Switching regulator question
  - From: Randall Nortman
- Re: gEDA-user: Switching regulator question
  - From: Bob Paddock
- Re: gEDA-user: Switching regulator question
  - From: Dan McMahill
- Re: gEDA-user: Switching regulator question
  - From: Randall Nortman
- Re: gEDA-user: Switching regulator question
  - From: John Griessen
- Re: gEDA-user: Switching regulator question
  - From: Randall Nortman
- Re: gEDA-user: Switching regulator question
  - From: John Doty
- Re: gEDA-user: Switching regulator question
  - From: Steven Michalske
- Re: gEDA-user: Switching regulator question
  - From: Randall Nortman

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