Approaching noiselessness with the LT3045

[sercan85]

Yes i use 10uf x7r and i use screen shielded cable so close to load. I dont use big output cap on my project.
You have said “i need to more then 5a” 4 quad chip 2 amper. You need to use 10 chip for 5A and it could be very expensive…. If you dont desing so specific devices that s so sensitive to noise.
I use my 78xx and 79xx pin out v- and v+ regulator if i need to more low noise

 

[Anode]

Hi Sercan, thanks for your reply, I totally agree with you, I prefer to use only one IC and a Transistor, 5A is the maximum for my Audio equipment.

 

[sercan85]

I use it on my pi4 streamer. If you need to pcb i can send you

 

[Anode]

Oh very nice, thanks but I will make a PCB this is for a External Audio equipment, I need to put this PSU in a external box.

Great work and thanks for your proposition I really appreciate, are you Engineer ?

 

[sercan85]

You can build lt3042 npn high current version with lt3045 and D44H11 but carefull about lt3045 pins. If you need to Continuous more than 5A always. you can try BUV48A but I not sure I havent tested it. input voltage must be 16.5-18v and you need to really big heatsink. Please create good ground plane for lt3045...

 

[gerhard]

with a beta of 8, you won't get far with the BUV48A, and with these
rise and fall times, I would not expect stability. Oh, and then the saturation voltage...

 

[sercan85]

you are right buv48a not good about hfe... d44h11 has 50-60 hfe. it is good choice. for lt3045. 2sd1047 is the same but end of life.

 

[Anode]

Oh thanks again for all this infos, I will buy this D44H11...did you see a real sonic difference between the standard regulators (78 or LM317/337) and this new LTXXX LDO ?

 

[sercan85]

it is depend on where you use it. I use it on my es9028prodac. DVCC paralel 1A , avccl and avccR 500ma and crystek 100mhz 500mA. I cant say about sound but Fast Start-Up Capability Load Transient Response are very good. I dont thing use it on my pcm56 dac. definitely I will use LT3097 on my discrete IV stage...

 

[Anode]

Hi all, a question again, do you know is useful to put a RL filtering with this LDO regulator ?

 

[sercan85]

If you use a super regulator you dont need to RL filter. My experience is R Or L filter better for smps and class a source…

 

[Anode]

Hi Sercam ok I see, thanks for your advise, I saw that some company put them, and other no very sometime strange, what's your opinion about the "Capacitance multiplier" ?

 

[sercan85]

Yes I have seen a lot of brand make it. Especially marantz. But you dont make discrete power supply. you want to make LT3045. High psrr ultra low noise etc.. please read LT3045 datasheet. you dont need to additonal filter etc.. Unnecessary filter sometimes can effect high freq. bad on audio devices

 

[Anode]

Ok I see, I will use the new LT3046 for a Professional Audio equipment.

Many thanks to you for your infos

Where are you ? me In France

 

[sercan85]

Latvia

 

[jeremysk]

Is posssible share gerber file and BOM for 4A for RPI4

 

[mmoraw]

I was going to ask about the same thing, any chance you could share some more details on your 4A pi4 psu, please ?

 

[sercan85]

that is reference desing of LT3042 NPN version.