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Old 14th July 2006, 01:06 PM   #1
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Default Jan Peter help

Hi, Jan Peter,

4 modules of UCD180 has arrived here. I wanted to make 4 channel car amp using these modules.
The smps will be unregulated, switching about 30khz pushpull, output from diodes is only C (not L-C). Input = 12V (car supply), output will be asked to you first.

My question is :
1. Since car speakers are most commonly 4ohms, what supply voltage rail you suggest for these 4 modules?
2. Can I make just 1 SMPS to power all these 4 modules, or I must make 4 independent SMPS for each module?

If I can use just 1 smps, can they be connected directly or there is a certain method for using single power supply for powering several UCD modules?
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Old 16th July 2006, 07:44 AM   #2
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If you can make a suitable supply to power multiple modules, do so.

You'd probably be taking a hit in audiophileness, but we're talking car audio anyway right? Imaging and soundstage in car audio is best done with digital delays.

So what it amounts to is what kind of supply can you build.

As per the power output, you'll find the supply voltage in the data sheet of course. What you need to be concerned with is the current capability of your power supply I would think.

You can connect multiple supplies directly, but you can also experiment with certain methods of isolating one amp from the other. Feel free to email me if you don't know what I mean by that.
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Old 16th July 2006, 11:54 AM   #3
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Hi, Chris,

From some sentences here (I forgot where), I get impression that UCD modules are quite fragile. If I'm not mistaken, someone here burn his UCD module because he touch the SMD parts by hands when it is in operation?
This way, I'm afraid to attach anything, like osciloscope probe, to know what difference if 1 or several UCD modules are attached to 1 supply. They are selfoscilating, if I attach more than 2 modules with the same supply, they won't disturb each other?

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You'd probably be taking a hit in audiophileness, but we're talking car audio anyway right?
I don't understand. What does it mean?

Quote:
As per the power output, you'll find the supply voltage in the data sheet of course.
The datasheet is only 1 sheet of paper. It said max voltage, protection voltage (52V), but do not specify what is the best voltage for 4 or 8ohm speakers.
Like Chipamps (LM3875, 3886), they specify different max voltage for different speaker impedance. Is that UCD modules takes all speaker impedance the same?
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Old 16th July 2006, 12:10 PM   #4
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Hi,

They're more robust than you can imagine and will survive just about anything you can throw at them that can be considered to fall under the category of normal use.

It just seems to make sense to me that touching the smd components with your finger on a .. for the sake of argument.. "high speed" power switching module, you're going to create all kinds of capacitive shorts. So it's easy not to touch it.

It does use truly discrete drivers after all.

As far as attaching probes, you know what you're doing and you know where they go, if you dont' short anything out with them, what's the problem?

The 52V is your overvoltage threshold so you dont' really want to run that high, you'll also see the recommended voltage, so apply that to get the power you want. They have current protection at I think 10amps. So if you have 4 modules and you want to run them off one supply, then your supply should be potent enough in current capability to handle them all at worst case of 40 amps sustained for whatever period of time.

It may prove to be more advantageous to make four 10amp supplies, I really don't know.

"Is that UCD modules takes all speaker impedance the same?"

Yep, long as they don't run out of current.
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Old 18th July 2006, 12:01 PM   #5
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lumanauw,

how is your UcD coming along?? are you using SMPS to power it up now?
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Old 18th July 2006, 12:05 PM   #6
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I haven't work on it yet. I will post the result/difficulties when I worked it

Is Jan Peter or Mr. Bruno Putzey is not here anymore?
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Old 18th July 2006, 12:33 PM   #7
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They're around I'm sure, but one problem is they're also very busy. Alot of people are just starting new thread after new thread these days because those ever so handy dedicated ones are just "too long" for them to bother with, so they're less likely to spot this kind of question I think.

If you hold off just a little while I expect it's the exact kind of question you might get answered once they release their SMPS
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Old 18th July 2006, 01:12 PM   #8
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Default Embarrassed wince...

I'm afraid I've started a few recently. I hope I'm not making a mess of things. I truly do appreciate the help and try not to post what's already been posted...



Regards,
Tom
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Old 18th July 2006, 01:14 PM   #9
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I named no one!! You're not along though I've come to terms with it.
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Old 18th July 2006, 02:10 PM   #10
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hmmmmmm...

@lumanauw,

im currently "upgrading" an AT PC power supply... changing transformer for higher output current @ 12VDC...although, Im having a HARD time understanding HOW to rewind one... darn too hard to understand... I have been winding SMPS with BiFilars, but PC AT, just too hard for me... maybe I need practice...

after that, I plan to build SMPS 12V -->> +/-36V.....I know its much easy to build this one becuase I HAVE MADE ONE myself....
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