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Anyone tried Chinese LT3042 board?
Anyone tried Chinese LT3042 board?
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Old 29th October 2017, 01:19 PM   #11
slmnklyc is offline slmnklyc  Turkey
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I also bought this reg.But It didn't work.
Maybe I did a wrong thing I couldn't remember now.
When I measure The output voltage it is zero sometimes 0.1v.
I won't know why??
There are LT3045 units from ldovr.com(with on/off Switch) or tekdevice.com.
These are Imax 500mA.
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Old 9th November 2017, 12:42 PM   #12
dotneck335 is offline dotneck335  United States
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The 20 volt max input is quite limiting, as is the 200mA current. Two of these would be $33. Better off with a Jung-Didden regulator, IMO.
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Old 12th November 2017, 01:17 PM   #13
jean-paul is offline jean-paul  Netherlands
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Just ordered one to try out. It can handle 1A because of the PNP pass transistor. A 20V input voltage maximum is not too limiting as the PSU is 3.3 or 5V output. It does not make much sense to use an LDO board with too high input voltages. As a PNP pass transistor has been used for more output current dropout voltage is approx. 1.5V. There are various toroid transformers putting out 7V AC which should be enough for 5V output. When being used for 3.3V output a 5V transformer will work fine.

The added PNP does not seem to make specifications much worse but paralleling LT3042 is technically better. You would need to parallel 5 of them though for 1A (or 2 x LT3045 in parallel).

Solutions - Increasing Output Current of the Ultralow Noise, Ultrahigh PSRR LT3042 200mA Linear Regulator

* It should be clear that current limiting and thermal shutdown protection are lacking. Short circuiting the output is best avoided (as always).
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Last edited by jean-paul; 12th November 2017 at 01:38 PM.
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Old 12th November 2017, 01:59 PM   #14
slmnklyc is offline slmnklyc  Turkey
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Probably at First try,I Connect the input voltage to output section of the board and destroyed The board.I changed The output transistor but it still doesn't work.
And probably I destroyed The main chip..
So if you try The board, BE CAREFULL about which side is input and which side is output!!
And it doesn't come with user manual

I took my
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Old 12th November 2017, 02:23 PM   #15
jean-paul is offline jean-paul  Netherlands
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Even the best PSU would not survive that probably Anyway, normally the input connector is close to the rectifier diodes.

I guess if you replace the LT3042 it will work again.
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Last edited by jean-paul; 12th November 2017 at 02:34 PM.
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Old 12th November 2017, 08:39 PM   #16
euro21 is offline euro21  Hungary
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Anyone tried Chinese LT3042 board?
This board based on very simple "school book" schematic, only with little optimization.

The PNP pass transistor destroys PSRR (more at higher current), increasing of filter capacitors improves this.
Output impedance not outstanding, but adequate.
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File Type: jpg LT3042 boosted.jpg (92.5 KB, 158 views)
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Old 12th November 2017, 09:07 PM   #17
jean-paul is offline jean-paul  Netherlands
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10 dB increase in PSRR making it 70 dB is still not bad. That is better than many other regs without a pass transistor...

Solutions - Increasing Output Current of the Ultralow Noise, Ultrahigh PSRR LT3042 200mA Linear Regulator

The board is not optimised, please see the original schematic in the link. The cheap chinese board lacks some parts and has some other values.
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