RE: TI-H: ti-calc schematics...

To: ti-hardware@lists.ticalc.org
Subject: RE: TI-H: ti-calc schematics...
From: Grant Stockly <gussie@alaska.net>
Date: Tue, 14 Jul 1998 07:16:54 -0800 (AKDT)
Delivered-To: ti-hardware-outgoing@towerguard.unix.edu.sollentuna.se
In-Reply-To: <01BDAE53.EEDFB9C0@chippewa.nsc.com>
Reply-To: ti-hardware@lists.ticalc.org


>Grant,
>
>You have to be careful when you buy inexpensive switchers (DC to DC
>convertors).  Some are constant duty cycle convertors that require a
>regulated input, and provide an output voltage that is a fixed ratio of
>the input.  If your input varies from 4V to 6V (5V +/- 20%) then your
>output will vary 20%.

Who said I bought inexpensive ones?


>The better switchers have feedback that varies the duty cycle in response
>to variations in the input, maintaining a constant output voltage.
>
>The equation you start with when designing a switcher is:
>
>Vout = Vin (duty cycle)(transformer turns ratio)(efficiency)

Yes I know.  I had to do all that months ago when making my mp3 player.

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References:

RE: TI-H: ti-calc schematics...

From: Mike Leister <leister@baghwan.nsc.com>

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