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Class D Switching Power Amplifiers and Power D/A conversion

Hypex UCD400 OEM & SMPS 400A400 wiring questions
Hypex UCD400 OEM & SMPS 400A400 wiring questions
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Old 29th July 2017, 04:22 AM   #1
Pippi Lindenstroem is offline Pippi Lindenstroem  United Kingdom
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Join Date: Oct 2009
Smile Hypex UCD400 OEM & SMPS 400A400 wiring questions


Hypex UCD400 OEM Amplifier & SMPS 400A400 Power Supply wiring questions


The Hypex Data Sheet for the UCD400 OEM and SMPS400A400 overall is pretty self-explanatory so far but still leaves me with a few questions. Especially when it comes to the connections for “SMPS Stand-by”, “Amp Stand-by “ and “Auto Amplifier Enable” on the SMPS400

Therefore it would be great to get some info and advise about some of the pin-outs and their wiring.

On the UCD400 OEM amp-module:

Pin32 Clipping detection output
Not necessary for basic amp operation, correct?
If applied, how and where to connect (resistor, LED network?)?

Pin33 DC Error Output
Not necessary for basic amp operation
If applied, needs to be connected to connector/pin J3.4 on the SMPS400A400
Or/alternatively
If applied, + positive side from speaker outs needs to be connected to the J6.1 and/or J6.3 on the SMPS, correct?

Pin34 ON/OFF Control Active Low
Necessary for basic amp operation otherwise the amp won’t leave the stand-buy mode.
Pin 34 needs to be connected via switch to ground to switch the amp active, correct?

Pin36 Current Limiter Monitoring
Not necessary for basic amp operation, correct?
If applied, how and where to connect?

On the SMPS400A400:
How/Where do I connect “SMPS Stand-by” (Connector J5.1 Input), “Amp Stand-by “(Connector J5.2 Input) and “Auto Amplifier Enable” (Connector J3.5 Output) ??

From the SMPS Data Sheet:

SMPS Stand-by
Applying an external DC voltage to this input will put the SMPS in standby. Both main and auxiliary output voltages will drop gradually. Removing the standby voltage will result in a normal soft started start-up of the SMPS400. Putting the SMPS in standby also automatically releases the Auto Amplifier Enable line guaranteeing pop-free shut down of the connected UcD amplifier.

Amp Standby
Applying an external DC voltage to the Amp Standby pin will put the amplifier in standby. The connected amplifier must be connected to Auto Amplifier Enable, described below, in order to use this option.

Auto Amplifier Enable
When the enable-line of a UcD/NCore series amplifier is connected to this pin, the amplifier will be enabled and disabled automatically when the SMPS400 is switched on and off. By doing so, it prevents unwanted audio artefacts during power cycles.


Any other tips and hints to get amp and PSU working to their full potential?


Many thanks in advance for any help

Last edited by Pippi Lindenstroem; 29th July 2017 at 04:26 AM.
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Old 31st July 2017, 08:13 AM   #2
Pippi Lindenstroem is offline Pippi Lindenstroem  United Kingdom
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Wow, no one likes to share their (advanced) knowledge when connecting Hypex OEM model and smps ?
With the large numbers of Hypex OEM model sales on ebay at the moment it might be helpful for more than one person having all the information in one place
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Old 1st August 2017, 06:20 AM   #3
alexIG is offline alexIG  United States
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Join Date: Aug 2008
Location: PA
Quote:
Originally Posted by Pippi Lindenstroem View Post
Wow, no one likes to share their (advanced) knowledge when connecting Hypex OEM model and smps ?
With the large numbers of Hypex OEM model sales on ebay at the moment it might be helpful for more than one person having all the information in one place
I've got the same problem when I was looking for a wiring diagram for 2x NC400 and SMPS 1200 A400. Could not get any response neither from Hypex nor from Hypex builders on this side. I did find one eventually somewhere on the net but I'm not 100% sure if it is correct. I don't think it would be valuable to you but it might give you some ideas so I can PM it to you if you like.
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Old 1st August 2017, 06:42 AM   #4
Fenalaar is offline Fenalaar  Norway
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Join Date: Apr 2011
In order:
Pin 32 - not needed
Pin 33 - connect to SMPS J3.5
Pin 34 - connect to GND
Pin 36 - not needed

SMPS standby - leave disconnected
Amp standby - leave disconnected
Auto amplifier enable - connect to pin 33

Johan-Kr
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Old 2nd August 2017, 11:02 PM   #5
Antana is offline Antana  Europe
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Join Date: Nov 2015
Quote:
Originally Posted by Pippi Lindenstroem View Post
Wow, no one likes to share their (advanced) knowledge when connecting Hypex OEM model and smps ?
Just be patient, not everyone is reading this forum 24/7. Your question was just up there for 2 days.

Anyway, has Fenelaar answered your question? Do you need more assistance?
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Old 4th August 2017, 07:17 PM   #6
Pippi Lindenstroem is offline Pippi Lindenstroem  United Kingdom
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Join Date: Oct 2009
Quote:
Originally Posted by Fenalaar View Post
In order:
Pin 32 - not needed
Pin 33 - connect to SMPS J3.5
Pin 34 - connect to GND
Pin 36 - not needed

SMPS standby - leave disconnected
Amp standby - leave disconnected
Auto amplifier enable - connect to pin 33

Johan-Kr
Thank you very much for your help
You are stating "Pin 33 - connect to SMPS J3.5"
Pin 33 on the UCD400OEM is the DC Error Output and J3.5 on the smps400A400 is the Auto Amplifier Enable Output

Isn't it rather correct that Pin33 the DC Error Output on the module goes to J3.4 the DC-Error Input on the smps?
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Old 4th August 2017, 11:50 PM   #7
Antana is offline Antana  Europe
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Join Date: Nov 2015
DC error output should naturally not be connected to Auto Amplifier Enable Output. They are both open collector outputs. AAEO is meant to enable the connected amp as soon as as all voltages of the SMPS are in range. DC error shuts down the SMPS in case of fatal failure of the amp.
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Old 5th August 2017, 07:03 AM   #8
Pippi Lindenstroem is offline Pippi Lindenstroem  United Kingdom
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Join Date: Oct 2009
Quote:
Originally Posted by Antana View Post
DC error output should naturally not be connected to Auto Amplifier Enable Output. They are both open collector outputs. AAEO is meant to enable the connected amp as soon as as all voltages of the SMPS are in range. DC error shuts down the SMPS in case of fatal failure of the amp.
That's why I had this question to his answer.
The data sheets from smps and amp module stating clearly that Pin33 the DC Error Output on the module goes to J3.4 the DC-Error Input on the smps

I understand the basic connections to have the module working but I like the idea to use the stand-by function by applying an external voltage to the smps.

The smps data sheet states:
(This in conjunction with "SMPS Stand-By" and "Amp- Stand-By")

6.3 Auto Amplifier Enable (J3.5 Output)
When the enable-line of a UcD/NCore series amplifier is connected to this pin, the amplifier will be enabled and disabled automatically when the SMPS400 is switched on and off. By doing so, it prevents unwanted audio artefacts during power cycles.

Question: Where/Which pin is the enable-line on the UcD/NCore series amplifier that needs to be connected to Auto Amplifier Enable (J3.5 Output) on the smps?
I see no other options but (Input) PIN 34 on the UCD 400 OEM amp module. It's the pin that can be switched to ground otherwise to switch the amp on

Last edited by Pippi Lindenstroem; 5th August 2017 at 07:20 AM.
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Old 5th August 2017, 07:21 AM   #9
Antana is offline Antana  Europe
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Correct. PIN 34 is the enable line and should be switched to ground or pulled low bij de open collector output of the SMPS.
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Old 5th August 2017, 09:53 AM   #10
Pippi Lindenstroem is offline Pippi Lindenstroem  United Kingdom
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Join Date: Oct 2009
Quote:
Originally Posted by Antana View Post
Correct. PIN 34 is the enable line and should be switched to ground or pulled low bij de open collector output of the SMPS.
Thank you. Here we go
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