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Old 23rd July 2010, 09:44 PM   #1
ekaerin is offline ekaerin  Sweden
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Default Hypex UCD400 OVP problem

Hi all,

I have just finished an ultra compact amp with Hypex modules.
The amp consists of 2 UCD400 amps and one SMPS400.

Pity is, I bought everything at the same time at HiFi kit here in Sweden, thinking the parts would be compatible.

However the SMPS puts out about 70Vdc at my nominal line voltage which is 239Vac tripping the OVP on the amps.

It seems the on board caps and power FETs can handle the 75V limit the higher serial numbers have.

Is there a quick fix I can do ,without risking the modules, to set the OVP to 75V nominal.

Also I would like Hypex to include in the SMPS datasheet the maximum external cap the supply can handle
without the current limit inception to kick in making the startup ramp non monotonic.
I added 4x4700uF and it restarts at least once.

Regards / Mattias
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Old 23rd July 2010, 10:01 PM   #2
ekaerin is offline ekaerin  Sweden
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Default And some pics.

The amp will be some 200W / liter.
I may have to squeeze in a small fan but it seems to be OK so far....
Attached Images
File Type: jpg D400.jpg (97.9 KB, 431 views)
File Type: jpg D400_top.jpg (80.2 KB, 405 views)
File Type: jpg D400_VU.jpg (26.6 KB, 393 views)
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Old 24th July 2010, 08:44 AM   #3
luka is offline luka  Slovenia
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aren't those modul for ~+/-60
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Old 24th July 2010, 11:31 PM   #4
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Any reason for those additional caps? I was playing with the idea also to make a really small amp.

This case: LEX COMPUTECH - Product

It's a PC manufacturer but I have gutted one of their cases I had lying around. Pure Aluminum, heavy, pretty. I tried to contact the maker to see if they sell the enclosures only.

This can easily house a mono SMPS+UCD400, even stereo one (with one SMPS)
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Old 25th July 2010, 07:06 PM   #5
ekaerin is offline ekaerin  Sweden
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Yes luka they probably are. New versions are Hypex smps comp.
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Old 25th July 2010, 07:24 PM   #6
ekaerin is offline ekaerin  Sweden
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Yves. I had the caps already and wanted to use them. Dunno the impact but they sure help lowering the supply impedance.
The cases looks good. I looked in to computer cases too.
Mine was an old modem. Just made the panels.

Rgds/ Mattias
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Old 19th September 2010, 03:44 PM   #7
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Someone at Hypex told me that the "old" modules can be adapted with changing 2 components on the module.
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Old 20th September 2010, 06:30 PM   #8
ekaerin is offline ekaerin  Sweden
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Yves. That is correct, Hypex support told me too. I just had to ask them.
Hats off !

/ Mattias
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