Best low noise regulator?

[gerhard]

Analog Devices ADM7150 is also interesting.

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regards, Gerhard

 

[erikovsky]

Hi,

edit: power boosted schematics corrected and zip-file changed.

jauu
Calvin

Thank you so much dear friend🙂
I've design a 3042 regulator module, pin-pin compatible with LM317, using a TO-220 D44H11. It can be mounted on a regular to-220 heat sink, just like LM317, so pretty interesting.

 

[erikovsky]

Hi all,

I think LP38798 is also a very good consideration. 800mA out, ultra low noise, ultra high PSRR.

http://www.ti.com/lit/ds/symlink/lp38798.pdf

 

[cbdb]

The current should flow from the ground thru the load into the Negative regulator. How does the negative regulator sink current into the emitter of the output transistors? Not so sure this will work.

 

[erikovsky]

Hi,

Based on LP38798, I designed a 7805-compatible TO-220 board.
SMDs are 1206, which is relatively DIY-friendly.
Any comments?

Thanks

Eric

 

[keantoken]

The TO220 vias look a bit small to my untrained eyes. Could you clip off the 7805 at the knee and slip this board onto the pins?

 

[erikovsky]

The TO220 vias look a bit small to my untrained eyes. Could you clip off the 7805 at the knee and slip this board onto the pins?

Hi,

Not exactly realizing your words, but it's based on a TO-220 model, so the vias,size and mounting holes will just fit. An L-shape 2.54mm 3pin is inserted, making it just like 7805.

 

[keantoken]

I meant the through hole size, but nevermind.

 

[erikovsky]

I meant the through hole size, but nevermind.

Thank you, anyway.
So here's schematic I proposed, the 7805-compatible LP38798 Module.

 

[zarandok]

So what...?

 

[erikovsky]

So what...?
View attachment 576791

I didn't claim I am the first one to propose this idea. what is wrong with your meaningless reply?

 

[zarandok]

Sorry, but I don't understand your message....

 

[bugbear]

Thank you so much dear friend🙂
I've design a 3042 regulator module, pin-pin compatible with LM317, using a TO-220 D44H11. It can be mounted on a regular to-220 heat sink, just like LM317, so pretty interesting.

It would be more than a little interesting (depending on cost, obvs) to drop that into a off-the-shelf LM317 regulator (or PSU) board; these are cheap and readily available.

Would it become 3042-grade-wonderful, or would the rest of the board drag down the performance too much?

BugBear

 

[oxothuk]

Got a first batch of LT3045 Boards (will test during holidays)

I brief - 25 x 35mm
Cin - 47uf 25v Tantalum (Kemet) + 10uf 25V MLCC (Murata)
Cout - 10uf 25V MLCC (Murata)
Cset - 10uf 25V MLCC (Murata)
Vishay resistors

Voltage can be configured by PIN (1-15v , 1V step) or by single resistor

More details will be posted here

Season Grettings

 

[carlmart]

Got a first batch of LT3045 Boards (will test during holidays)

I brief - 25 x 35mm
Cin - 47uf 25v Tantalum (Kemet) + 10uf 25V MLCC (Murata)
Cout - 10uf 25V MLCC (Murata)
Cset - 10uf 25V MLCC (Murata)
Vishay resistors

Voltage can be configured by PIN (1-15v , 1V step) or by single resistor

More details will be posted here

Have you got an LTSpice sim for this regulator?

 

[Fidelius]

not a newbie, but I can't see what is the purpose of R2 and R7 in this schematic.

 

[altor]

Maybe to discharge el. caps when the power is off? This looks like high voltage anode supply.

 

[keantoken]

Yes, anyone who works on it does not want to get shocked by charge remaining in the capacitor.

 

[Mark Tillotson]

It might be a legal requirement even... An electrolytic can hold charge for hours or days and be lethal - equipment does get both serviced and recycled and its a hazard for both, and should be identified as such in the risk assessment.

 

[jackinnj]

You can discharge an electrolytic to "zero" DCV, then measure it the next day and the voltage will have increased quite a bit.

I bought a batch of electrolytics from Arrow about 10 years ago, 330uF/300V. They were all upvoltage upon arrival.