Re: 19K6400

On Fri, 23 Jan 1998 16:48:24 -0800, Clay Cowgill <ClayC@diamondmm.com> wrote:

>> So the end of this is, I will add the diode, which helps if anyone
>> wants to
>> use the board at higher regulation voltages (Clay? There are other
>> issues
>> to be dealt with since you have to ensure that the Vin-Vout
>> differential is
>> less than 40V), and also to save the IC incase someone drops a foil
>> gum
>> wrapper on the isolation transformer ;-)
>>
>I can't think of anything. I'm figuring there will be an input/output
>differential of at most 10-12V with a 40V CT transformer. Anyone know
>what the current draw would be like on the 40-0-40? (Or even the
>current draw on a "standard" WG6100 would be useful.) I found a whole
>box of "likely candidates" for transformers at lunch. 110V in with
>center-tapped 39V and 50V secondaries, and a 9VAC (non CT) output. Look
>like they might have been for something monitor-like (9VAC as heater
>voltage? Maybe a little high...).

9vac is the common voltage used in a 5v supply.

Checkout the National Data books, they had a few ideas on how to run their
regulators at higher voltages, including the use of a zener diode on the REG
pin. They point out that when you do this your regulation is only as good as
the zener, which is obviously not as nice as the regulator alone. But probably
more than what's needed for the WG monitor.

-Zonn

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Received on Fri Jan 23 17:07:28 1998