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Old 25th November 2019, 11:37 PM   #1
pistollero is offline pistollero  Portugal
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Hello i have a 5v lt3045 based ps that i bought with the fixed set resistor as in the table datasheet.
I would like to get 1.8v instead of the 5v.
What is the correct resistor value to achive 1.8v?

Can someone help me?
Thks
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Old 26th November 2019, 12:06 AM   #2
Joseph K is offline Joseph K  Hungary
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18kohm..

Ciao, George

Ps: you can also control the validity of my 'thesis' - based on the same datasheet calculus (100ųA reference current)- - I tell You that You will find on the board presently a 50kohm set resistor.

Last edited by Joseph K; 26th November 2019 at 12:10 AM.
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Old 26th November 2019, 08:47 AM   #3
pistollero is offline pistollero  Portugal
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Join Date: Apr 2016
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Quote:
Originally Posted by Joseph K View Post
18kohm..

Ciao, George

Ps: you can also control the validity of my 'thesis' - based on the same datasheet calculus (100ųA reference current)- - I tell You that You will find on the board presently a 50kohm set resistor.
Yes it you are right, has 49.9k instaled...
When i get home i will try..

Thks
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Old 26th November 2019, 04:42 PM   #4
russc is offline russc  England
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If it is easier, to avoid removing the original resistor, add 27K in parallel.
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Old 26th November 2019, 05:23 PM   #5
Joseph K is offline Joseph K  Hungary
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Join Date: Dec 2004
Location: gran sasso
not a bad idea..

Also, while we are at it; that high impedance input is very sensitive to stray leakage currents, like those originating from the soldering flux deposited during your operation.
So wash thoroughly the board, with pure alcohol (isopropyl-alcohol..), afterwards. And dry it.
And be patient when trying after, it stil could be 'unstable', leaking, wait until it stabilizes.

Ciao! G
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