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Class D Switching Power Amplifiers and Power D/A conversion

dual nc400 + SMPS1200
dual nc400 + SMPS1200
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Old 8th December 2016, 03:18 PM   #1
pos is offline pos  Europe
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Default dual nc400 + SMPS1200

I got an interesting info from Hypex about the adapter board they are selling, that I though I would share here as the main ncore thread is now closed for good.

The SMPS600 is often preferred to the SMPS1200 when used with the nc400 as it does provide the necessary Vdr (16V min) to prevent the use of the internal regulator of the nc400n thus saving ~5W of power dissipation.

The SMPS1200A400 only provides 15.6V, which is sadly not enough for the need here (albeit it might work...).

So, going back to the adapter, it appears it does include a diode that raises the effective Vdr by 1V, making it just right for the nc400

A simple SMPS1200 now appears to be a no-brainer solution compared to two SMPS600 when powering a pair of nc400, as it is the same price as a SMPS600, has what appears to be a better heatsink design, and only dissipate 1.5W more watts than a single SMPS600 when idle (9W vs 7.5W), so 6W less than a pair of SMPS600.
Oh, and it does have a clean dual adapter solution to connect the modules, saving the trouble of building a Y cable
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Last edited by pos; 8th December 2016 at 04:06 PM.
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Old 8th December 2016, 03:53 PM   #2
Davey is offline Davey  United States
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Is that what the diode is for???

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Old 8th December 2016, 04:07 PM   #3
pos is offline pos  Europe
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Seems to be:
Quote:
On our SMPS1200 > 2x NC400 adapter board we use a diode between VdrN en V- to slighty raise the Vdr voltage. See below. The Vdr ground reference (Vdr-) is lifted 1 V, thus the voltage on Vdr+ is 1V higher.
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Old 9th December 2016, 07:23 PM   #4
incognito73 is offline incognito73  United Kingdom
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Just stumbled across this thread as i have the adapter board in question. I've ordered some parts from Hypex not so long ago and they kindly offered this adapter. Managed to elevate the pater PCB board (above the PSU) by using long plastic spacer on one of the SMPS12400 PSU mounting screws. I really appreciate SMPS1200 heatsink design, as I could apply the thermal paste underneath for better contact with the case, so that heat is transferred to the case itself, acting as one big heatsink (same procedure was put in place for NC400 modules)

Here is the photo of the new set-up.

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Old 25th March 2017, 03:47 PM   #5
DDF is offline DDF  Canada
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Thank you for sharing this, would have loved having this board before I built my 2xNC400+SMPS1200. This would save half the effort.

Is there any performance difference for the NC400 with the internal regulator off, using this diode?
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Old 24th May 2017, 11:36 PM   #6
DDF is offline DDF  Canada
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Put this diode mod in, saw no difference in heat at idle. After contacting Hypex, they kindly responded with (FYI):

"Weve recently discovered this does not really work as intended. So better leave the diode out and connect VdrN directly to V- rails."

Online hypex store still shows the diode in the connector board. No response when I asked if the diode was detrimental or innocuous which tells me its probably better to remove it.
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Old 26th May 2017, 06:36 AM   #7
pos is offline pos  Europe
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Wow, now that is a huge letdown
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Old 26th May 2017, 12:56 PM   #8
Davey is offline Davey  United States
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Quote:
Originally Posted by DDF View Post
"Weve recently discovered this does not really work as intended. So better leave the diode out and connect VdrN directly to V- rails."
Uh, yeah.

Dave.
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Old 15th May 2019, 09:30 PM   #9
spikestabber is offline spikestabber  Canada
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My nc400 looks to need a recapping after roughly 4 years, at least some of the SMPS caps appear to be getting weak, it won't always startup on a cold start anymore, sometimes taking an hour to finally power on. (accidentally found this out one day when I left it turned on and left music playing)

That said, this comes back to the 10W of waste heat the amp consumes doing SFA due to the reasonings Hypex have for keeping the SMPS1200 @15.6V vdr in the first place, one would have thought they have a jumper for the DIY nc400 modules in a newer revision SMPS1200 for a 15.6/16V switch, and yes they have revised the PSU at least once or twice.

I have ordered a tiny 15VA 18/18V toroid (after having success using 3 of these really cute things in my dam1021 build), to add the required floating 16-24V (big range) regulated Vdr for the nc400, reducing its effective idle dissipation.
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Old 16th May 2019, 01:29 AM   #10
InOtIn is offline InOtIn
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Quote:
Originally Posted by spikestabber View Post
My nc400 looks to need a recapping after roughly 4 years, at least some of the SMPS caps appear to be getting weak, it won't always startup on a cold start anymore, sometimes taking an hour to finally power on.
Wow, this is extremely disturbing!! Ive had mine for longer than that... better check them out
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