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Old 23rd November 2012, 05:56 PM   #1
kumori is offline kumori  Europe
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Default Multiple regulators - What is the end-output-impedance?


I have a question about using multiple voltage regulators after another.
Is the output impedance, that the circuit "sees" just the output impedance of the last regulator used?

For example:

Transformer ---> CRC Filter ---> Gyrator serial reg --> Shunt regulator

Let´s say we have 1 Ohm Serial R in the CRC Filter, the Gyrator has an output impedance of 1 Ohm, followed by a shunt reg with 0.001 Ohm output impedance.

What does the powered circuit know about the 1+1 Ohm serial resistance, when the the last regulator stage has very low output impedance?

I guess also the size of the reservoir or decoupling caps comes into play, but can anyone give a reliable "rule of thump" or something similar?

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Old 23rd November 2012, 06:00 PM   #2
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The shunt regulator determines the output impedance.
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Old 23rd November 2012, 06:01 PM   #3
kumori is offline kumori  Europe
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OK, well that was easy.
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Old 23rd November 2012, 06:16 PM   #4
jcx is online now jcx  United States
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the (active) shunt reg determines the small signal output impedance

but once you try drawing more than the shunt reg bias current it cuts off and the output Z rises
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