Power Supply (8+) Group Test, LPS and SMPS

[Cornan]

17 hours ago, the_doc735 said:

Yes, it is expensive!

So, instead of spending all that money on preventing back pollution (from SMPS) electronics, why not just spend the money on a supremo LPSU in the first place, that does not suffer from those problems in the first place? Cheers!

Or you could buy yourself a cheap floating SMPS (like Gophert csp-3205II) followed by LT3045 in series (making it a LPS with a SMPS feeder supply). That would give you some extra cash to improve other things like isolation transformer, DC blocker and better ICs. ?

[Cornan]

1 minute ago, the_doc735 said:

hybrid?

 

Yes, you can certainly call it that. You can also use linear regulations  pre SMPS. Why not the new improved LT3094 for example? ?

[Cornan]

1 minute ago, Superdad said:

 

Not applicable. The LT3094 is a negative voltage regulator version of the LT3045.

 

http://www.analog.com/en/products/lt3094.html

 

 

Applications

• RF and Precision Power Supplies
• Very Low Noise Instrumentation
• High Speed/High Precision Data Converters
• Medical Applications: Diagnostics and Imaging
• Post-Regulator for Switching Supplies

 

[Cornan]

9 minutes ago, Superdad said:

 

So? The LT3045 spec sheet says the same thing.  We all know that.  The point is, the brand new (barely available) LT3094 is for negative rail supplies, not for +DC voltage.  It is still great news for analog circuit designers needing to build an ultra-low-noise bi-polar supply.  It is just not applicable here.

 

Sorry, I just read the great specs and that it was suitable forSMPS pre-reg. Did’nt notice the negative only remark for the LT3094. 

[Cornan]

4 hours ago, the_doc735 said:

Oh, doesn't that SMPS still back pollute the AC grid though and in turn affect other components?

 

All SMPS is not the same! I’ve used the Gophert for many tasks during the years and find it extremely good as a feeder supply for LT3045s. Just as good as a balanced ac-ac PSU. Much better than Uptone Audios supplied SMPS as a feeder supply for LPS-1.2. When powering a router or a ethernet switch it do improve by grounding the DC negative output just like my LPS do (but not when powering other non-ethernet devices though)