Hello diyers,
I'm looking to upgrade the diode FFSP0865A (datasheet) to give some more headroom in the SMPS power supply and keep things cooler and more stable under higher loads.
I've found an infineon and it seems pretty decent as upgrade, the IDH20G120C5XKSA1 (datasheet)
Any other suggestion? Don't mind paying a little bit more for a better part, no price limit.
Thanks for the help!
I'm looking to upgrade the diode FFSP0865A (datasheet) to give some more headroom in the SMPS power supply and keep things cooler and more stable under higher loads.
I've found an infineon and it seems pretty decent as upgrade, the IDH20G120C5XKSA1 (datasheet)
Any other suggestion? Don't mind paying a little bit more for a better part, no price limit.
Thanks for the help!
Again , if by stability you mean output voltage regulation, I think that's controlled by the PWM and feedback circuits and not the output diodes.
I'm just not sure that you will gain any measurable improvement simply by changing the diodes.
Also please be aware that the original FFSP0865A diode has an insulated tab that is not connected to the anode or cathode, but the IDH20G120C5XKSA1 has the tab connected to the cathode.
This may present a problem if the circuit has two (or more) diodes mounted on the same heatsink that are not in a common cathode configuration, and/or the heatsink is not electrically floating.
You may need to use insulating washers to mount the new diodes to the heatsink for the circuit to function at all.
You will need to carefully check the circuit with a meter to determine this.
I'm just not sure that you will gain any measurable improvement simply by changing the diodes.
Also please be aware that the original FFSP0865A diode has an insulated tab that is not connected to the anode or cathode, but the IDH20G120C5XKSA1 has the tab connected to the cathode.
This may present a problem if the circuit has two (or more) diodes mounted on the same heatsink that are not in a common cathode configuration, and/or the heatsink is not electrically floating.
You may need to use insulating washers to mount the new diodes to the heatsink for the circuit to function at all.
You will need to carefully check the circuit with a meter to determine this.
Trying to customize a r850x to output 12v to an amplifier or a future custom audio focused pc build (that could be used for games sometimes)
Linear power supply is not really an option so I just picked up one of the best regarding ripple noise and trying to do some modifications myself, love diy and tinkering so it could be a fun process too.
https://www.techpowerup.com/review/corsair-rmx-series-850-w-2021/3.html
This is the overall powersupply
Linear power supply is not really an option so I just picked up one of the best regarding ripple noise and trying to do some modifications myself, love diy and tinkering so it could be a fun process too.
https://www.techpowerup.com/review/corsair-rmx-series-850-w-2021/3.html
This is the overall powersupply
Ok, now I see.... the original diodes are really good... and I was wondering what type of SMPS would be using them... and now I see that the SMPS is already built to very high standards - nice!
To answer your question - I would keep the original diodes.
For audio purposes, you may want to consider a linear power supply... something like CLC, followed by a nice series regulation. For high currents, 2 X TO3 (or similar) transistors will do great up to 6A constant current (with a nice piece of heatsink).
For lowish currents and very low noise needs, the CLC could be followed by something like (multiples of... to get you to the current level you need....) LT3045 / LT3094.
Have a look here as well....
https://www.diyaudio.com/community/threads/post-you-smps-noise-spectrum-measurements.394518/
To answer your question - I would keep the original diodes.
For audio purposes, you may want to consider a linear power supply... something like CLC, followed by a nice series regulation. For high currents, 2 X TO3 (or similar) transistors will do great up to 6A constant current (with a nice piece of heatsink).
For lowish currents and very low noise needs, the CLC could be followed by something like (multiples of... to get you to the current level you need....) LT3045 / LT3094.
Have a look here as well....
https://www.diyaudio.com/community/threads/post-you-smps-noise-spectrum-measurements.394518/
Take advice, maybe bigger caps on DC side, not on AC side.
As mentioned, the original diodes are god enough, we have too many self proclaimed gurus here who tell you to change diodes, and put exotic capacitors.
Headroom is also a fancy word for transient response.
For that, put a bigger secondary side capacitor bank on the power amp rails....if indeed that is your application.
For a DAC, or a pre-amp, not worth the effort.
As mentioned, the original diodes are god enough, we have too many self proclaimed gurus here who tell you to change diodes, and put exotic capacitors.
Headroom is also a fancy word for transient response.
For that, put a bigger secondary side capacitor bank on the power amp rails....if indeed that is your application.
For a DAC, or a pre-amp, not worth the effort.
By 'here', I meant the internet, not this forum, that was my mistake.
You should see the claims on the internet of improvement in sound quality by replacing mains diodes with Schottky diodes, exotic audiophile capacitors in the various stages, and blah blah blah.
Op amp rolling also has some foolishness about it, as doing that means modifying the circuit also, which these self proclaimed intelligent people do not tell you, usually they tell you to take it out and replace with what they recommend.
One man even used SMD adapters, as the replacement was not sold as 8 pin DIP.
So, go on, enjoy the music.
You should see the claims on the internet of improvement in sound quality by replacing mains diodes with Schottky diodes, exotic audiophile capacitors in the various stages, and blah blah blah.
Op amp rolling also has some foolishness about it, as doing that means modifying the circuit also, which these self proclaimed intelligent people do not tell you, usually they tell you to take it out and replace with what they recommend.
One man even used SMD adapters, as the replacement was not sold as 8 pin DIP.
So, go on, enjoy the music.
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Oh, and more thing...just see how many high end brands used FR or Schottky diodes in their linear supplies, they certainly could afford the slightly higher price for those devices...
Accuphase, Denon, Onkyo, Marantz, and many others.....the answer, I feel, is none, zip, zilch, nada, and so on.
Accuphase, Denon, Onkyo, Marantz, and many others.....the answer, I feel, is none, zip, zilch, nada, and so on.
A few examples of large Japanese audio manufacturers specifying that they used fast recovery or schottky diodes in production.
https://audio-heritage.jp/PIONEER-EXCLUSIVE/tuner/f-120.html
https://audio-heritage.jp/PIONEER-EXCLUSIVE/player/pd-9010x.html
https://audio-heritage.jp/PIONEER-EXCLUSIVE/etc/h-z1.html
https://audio-heritage.jp/MARANTZ/etc/projectd-1.html
https://www.denon.jp/ja-jp/shop/denonapac-amplifiers_ap/pmasx11_ap
https://www.denon.jp/ja-jp/shop/denonapac-amplifiers_ap/pmaa110
There were also products where fast recovery or schottky diodes were used, but the manufacturer chose not to mention it.
http://kameson.net/audio/pm-88sef.htm
hth
https://audio-heritage.jp/PIONEER-EXCLUSIVE/tuner/f-120.html
https://audio-heritage.jp/PIONEER-EXCLUSIVE/player/pd-9010x.html
https://audio-heritage.jp/PIONEER-EXCLUSIVE/etc/h-z1.html
https://audio-heritage.jp/MARANTZ/etc/projectd-1.html
https://www.denon.jp/ja-jp/shop/denonapac-amplifiers_ap/pmasx11_ap
https://www.denon.jp/ja-jp/shop/denonapac-amplifiers_ap/pmaa110
There were also products where fast recovery or schottky diodes were used, but the manufacturer chose not to mention it.
http://kameson.net/audio/pm-88sef.htm
hth
Sure!!!!
A 1200V diode is twice as good as a 600V one.
A 20A diode is 2.5 times better than an 8A one.
So an amp fed from 12V secondary side will sound 2 x 2.5=5 times better than before.
Sadly, design does not work that way.
Not even if "money is no limit"
Suggest you leave that excellent PSU as-is and do not mess with it.
Serious.
I cannot read Japanese, I will take your word on it.
Marantz was eye candy. Thanks.
Some of the units look like they have SMPS, my reference was to the concept (Snake Oil) of replacing the main rectifiers in the linear power supply with high speed types for better sound, as an after market modification.
That means those on the secondary side of the step down transformer, where the filter caps and regulator circuits are seen.
This also implies that the engineers employed at those factories, making a premium product, were duffers, not using the 'proper' components.
Eye-Roll...
Again, leave it alone, enjoy the music.
Marantz was eye candy. Thanks.
Some of the units look like they have SMPS, my reference was to the concept (Snake Oil) of replacing the main rectifiers in the linear power supply with high speed types for better sound, as an after market modification.
That means those on the secondary side of the step down transformer, where the filter caps and regulator circuits are seen.
This also implies that the engineers employed at those factories, making a premium product, were duffers, not using the 'proper' components.
Eye-Roll...
Again, leave it alone, enjoy the music.
Hi. About smps diode replacement you want implement - here are my few cents.
At best , diodes should be replaced by proper mosfets , using synchronous rectification control ic. But this sometimes requires to change output winding connection. What topology is your smps ? There are many different ic's, designed for flyback , for LLC , and other variants. Greatly reduce heat and decrease power consumption.
If you are interested in just diode replacement, very hard to find diode with same parameters ,but less voltage drop on paper, and question if it will work noticeably better in practice.
At best , diodes should be replaced by proper mosfets , using synchronous rectification control ic. But this sometimes requires to change output winding connection. What topology is your smps ? There are many different ic's, designed for flyback , for LLC , and other variants. Greatly reduce heat and decrease power consumption.
If you are interested in just diode replacement, very hard to find diode with same parameters ,but less voltage drop on paper, and question if it will work noticeably better in practice.
I can't read or speak Indian, either
!Luckily, Google has added Japanese and many other languages to its translation service <https://translate.google.com>.
Here are Google-translated versions of the earlier links, so that you can be amused at the various cost-increasing antics that all of those duffer Japanese engineers implemented in volume production.
https://audio--heritage-jp.translat..._sl=ja&_x_tr_tl=en&_x_tr_hl=en&_x_tr_pto=wapp
https://audio--heritage-jp.translat..._sl=ja&_x_tr_tl=en&_x_tr_hl=en&_x_tr_pto=wapp
https://audio--heritage-jp.translat..._sl=ja&_x_tr_tl=en&_x_tr_hl=en&_x_tr_pto=wapp
https://audio--heritage-jp.translat..._sl=ja&_x_tr_tl=en&_x_tr_hl=en&_x_tr_pto=wapp
https://www-denon-jp.translate.goog...tl=en&_x_tr_hl=en&_x_tr_pto=wapp#divSubscribe
https://www-denon-jp.translate.goog...tl=en&_x_tr_hl=en&_x_tr_pto=wapp#divSubscribe
https://kameson-net.translate.goog/..._sl=ja&_x_tr_tl=en&_x_tr_hl=en&_x_tr_pto=wapp
Note that replacing the original OnSemi SiC Schottky with another SiC Schottky from Infineon is not likely to improve anything, and may cause problems and rounds of troubleshooting.
However, to claim that FRDs and Schottky rectifiers were never used in volume production by fairly large audio manufacturers, is demonstrably wrong, revisionist history.