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Old 03-01-2012, 04:19 AM #1
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Default LT3080 Driver Help

This is the adjustable current source I am working on. Can anyone help me verify this schematic to see if it works. I want to make sure it works before i turn it into board and build it.



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Old 03-01-2012, 05:14 AM #2
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Default Re: LT3080 Driver Help

Why don't you buy the components and bread board them and find out

What is TR1 and TR2 for

What's the input voltage range

Whats the max current out
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Old 03-01-2012, 05:29 AM #3
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Default Re: LT3080 Driver Help

I did build a prototype, but it only goes to 800ma. I was expected 1A from one chip.
I only use 1 LT3080 in prototype.
These regulator are rated 1.1A each and Vin up to 36V.
Tr1 and Tr2 is the pad for potentiometers.
I am looking for second opinion on this circuit.
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Old 03-01-2012, 05:38 AM #4
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Default Re: LT3080 Driver Help

How about drop a couple of the 3080's and a mosfet output for a second opinion
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Old 03-01-2012, 06:14 AM #5
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Default Re: LT3080 Driver Help

Why need mosfet?
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Old 03-26-2012, 07:01 AM #6
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Default Re: LT3080 Driver Help

I have not verified the part values, but the schematic looks ok to me. I build a lab supply with the LT3083 once and it worked fine. Did you take the Vdrop into account? This might explain why you are only seeing the 800mA instead of 1A. Try a supply with a higher voltage and see if that helps.
In addition to that you could run a simulation in LTSpice to verify your part values. It's easy to use, free and quite accurate, especially for LT parts ;-)
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