Electronics > Beginners

Choose for dc stabilizer for lab power supplay

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Emil88d:
Hello, i would like to build my own lab power sypply. It will be linear PS made out of toroidal transformer bridge rectifier and then stabilizer with purpura voltage of about 12-15 v and then to power LTC3780 dc-dc converter. I would like to have about 0-30V and 0-8A supply with with small disturbances and there is my question what stabilizer i must use to have stable voltage? I buy some LM338T but they are about 5A and i need connect them to have more power and what schematic should i use? I found them in datasheet of the LM.

David Hess:
Either will work but the lower example requires one fewer power resistor and no separate values.

Why is a DC stabilizer even required in your application?  The switching regulator should handle the ripple from the rectifier just fine.

Emil88d:
So i dont need this DC stabilizer before LTC3780 to work properly? Will it work fine with not so big distortion? If so i will skip this part.

Kleinstein:
The SMPS chips are perfectly fine without a regulator in front. For those chips even residual ripple is just a "slow" changing supply they can handle.

If combined would be first the SMPS chip and behind that a linear regulator to get faster transient response.

wraper:
It would be simply waste of power gone into heat. And you want to do it backwards. If you want cleaner output from DC/DC converter, you put linear regulator AFTER DC/DC converter, not before. Because DC/DC converter by itself is a major source of ripple.

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