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Old 12th October 2011, 12:25 PM   #521
AndrewT is offline AndrewT  Scotland
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It depends on what you require.
Output voltage and transformer voltage are only two parts of a much wider brief.
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Old 12th October 2011, 12:36 PM   #522
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It depends on what you require.
Output voltage and transformer voltage are only two parts of a much wider brief.
Thank you so much for your answer
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Old 12th October 2011, 12:45 PM   #523
AndrewT is offline AndrewT  Scotland
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Is the brief a secret?
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Old 12th October 2011, 12:55 PM   #524
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AndrewT,
Are you referring to his trannies VA? I think you may have left you point too open ended.
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Old 12th October 2011, 02:02 PM   #525
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I plan to do two regulators : 3.3v and 5v and i have 2x12v transfo .
Is it too high ?

Serge

The question is can i use a RCore transfo 230v~ 2x12v~ ( 30VA) for the regulators 3.3v and 5v.
One 12v~ for the 3.3v and the other 12v~ for the 5v ?

Serge
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Old 12th October 2011, 02:42 PM   #526
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Originally Posted by Sergelisses View Post
The question is can i use a RCore transfo 230v~ 2x12v~ ( 30VA) for the regulators 3.3v and 5v.
One 12v~ for the 3.3v and the other 12v~ for the 5v ?

Serge
If we multiply by AC output of your transformer by 1.4 we get the approx voltage DC your regulator will have to deal with, which is 16.8V. So we need to convert 16.8 to 3.3 and 5v so depending on the regulator type that will cause heat generation as it brings down the voltage. It is quite possible but would be more efficient if you brought the transformer voltage down. You need to include some voltage off for the diode bridge and allow some voltage headroom to operate the voltage regulator.
Chris
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Old 12th October 2011, 03:38 PM   #527
AndrewT is offline AndrewT  Scotland
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depending on the regulator type that will cause heat generation as it brings down the voltage.
Backbones is quite new to this and already he has identified an area that has not been considered in the brief.

How can anyone think that 12Vac and 5Vdc is sufficient to start a design analysis?
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Old 12th October 2011, 04:13 PM   #528
Salas is offline Salas  Greece
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The brief says 5VDC drop is recommended across the reg, 6.3VAC min 36VAC max transformer. That should suffice.
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Old 12th October 2011, 07:11 PM   #529
AndrewT is offline AndrewT  Scotland
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******* Hell !
What about current demand?
What about power dissipation?
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Old 12th October 2011, 07:20 PM   #530
Salas is offline Salas  Greece
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Its mentioned in the guide. Appendix 6.
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