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Class D Switching Power Amplifiers and Power D/A conversion

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Old 18th June 2010, 03:25 PM   #241
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Location: Malta, Europe
Default Alternative Power Supplies?

Quote:
S-350-24

Quote:
Originally Posted by cragthehak
I'm about to order one of these boards. From the sounds of things, would a smaller supply like this one at 24v 6A work better for this?

145W 24V DC 6A Regulated Switching Power Supply [K018] on eBay.ca (item 200475424389 end time 22-Jun-10 03:24:46 EDT)


Unless size is an issue, I would spend a little more and get the S-350-24 or 27v MeanWell power supply.
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Scott
This thread is getting really interesting with input from designer and knowledgeable members. My contribution is merely to point to an alternative method of obtaining a decently charged +24Vdc SMPS at a much lesser cost. It's on Decibel Dungeon detailing the connection of 2x computer SMPS's. http://http://myweb.tiscali.co.uk/nu...clonesmps.html
Although it's really for +/- supply there are some details on how to obtain +24V supply. I haven't built such a supply but would like to know the reactions and experience of members as to the technical diy aspects of such a project.

Thanks to all contributors, particularly Nick and hifimediy!
Best regards.
Joe A
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Old 18th June 2010, 03:29 PM   #242
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What's wrong with my linking a website. It already happened to me before. I click the Insert Link icon, paste a copied version of the site on window and select OK.

http://http://myweb.tiscali.co.uk/nu...clonesmps.html
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Old 18th June 2010, 03:48 PM   #243
TCx is offline TCx  Czech Republic
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Quote:
Originally Posted by sonata149 View Post
What's wrong with my linking a website. It already happened to me before. I click the Insert Link icon, paste a copied version of the site on window and select OK.

http://http://myweb.tiscali.co.uk/nu...clonesmps.html
Hi, you have "http://" doubled in the link. It's the reason why the link doesn't work.

BTW, I have ordered this unbelievably cheap SMPS for the TK2050 amp board. I haven't received it yet so I am curious how it will work.
Wholesale 150W SMPS Product-150W +5V/1A/+ 15V/1A/24V/5A ATX Switch Power Supply
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Old 18th June 2010, 04:07 PM   #244
Galgo is offline Galgo  Israel
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Shouldn't we look for SMPS with as high switching frequency as possible?
The S-350-24 or 27v Mean-Well's has 25kHz switching frequency - but I believe there are models with >40kHz -like the above item - shouldn't they be better or would 25kHz is good enough with these kind of digital amp IC's ?
Gal
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Old 18th June 2010, 05:22 PM   #245
teamacc is offline teamacc  Netherlands
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Use the cheap SMPS only with caution:
It needs load on all other rails in order to function properly (no smoke).
Connecting more than 1 12v supply in series might work, but the cheap meanwell 24v supplies are designed for 24v, and are even cheaper.
Further, they are smaller.

If you have the money to invest in this 2050 board, then you have money to buy a decent smps to go with it.
If you dont, dont buy any board, or buy the sure board, which is much more moddable.
*goes soldering his tk2050 sure board once more :P
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Old 18th June 2010, 06:10 PM   #246
glt is offline glt  United States
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Quote:
Originally Posted by hifimediy View Post
Right. we have to choose another power stage IC for 200W use.
My idea was to use a 12V supply (for portable application 1 battery is lighter than 2 batteries :-))

I'm referring to http://www.st.com/stonline/products/...e/an/10606.pdf in my comments below:

I suppose the amp uses two STA505 output stage (one per channel) in parallel BLT configuration (Figure 7 of spec)

But according to figure 11, you can parallel the two ST505 in parallel BLT for higher current capability.

Since I plan on using 12V, I won't be reaching anywhere close to 100W. maybe 25W? as other lower voltage implementation of tripath chips.

Thus, is it possible for one to modify the output and get more power out of a 12V battery? It seems straightforward enough, connecting the output of L1 with L3 and the output of L2 with L4
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Old 18th June 2010, 06:13 PM   #247
TCx is offline TCx  Czech Republic
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Thank you for your advices, teamacc. Actually, I wanted to order Meanwell 27V SMPS originally but it's a bit bulky and I wanted my new SMPS to fit into particular metal case. The one mentioned above seemed to be good in this aspect and its low price is only a nice bonus. :-)

My understanding is that I do not have to connect two 12V rails in series, it seems to have one 24V, plus +-15V and +5V.

Regarding the price, I paid $25 incl. shipping and custom modification of main output voltage to 36V (well, there were also some other items in my order). I haven't found so cheap Meanwell SMPS anywere yet.
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Old 18th June 2010, 06:17 PM   #248
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Default Repeat post with live link.

Thanks TCx

This thread is getting really interesting with input from designer and knowledgeable members. My contribution is merely to point to an alternative method of obtaining a decently charged +24Vdc SMPS at a much lesser cost. It's on Decibel Dungeon detailing the connection of 2x computer SMPS's. SMPS for the Gainclone chip amp

Although it's really for +/- supply there are some details on how to obtain +24V supply. I haven't built such a supply but would like to know the reactions and experience of members as to the technical diy aspects of such a project.

Thanks to all contributors, particularly Nick and hifimediy!
Best regards.
Joe A
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Old 18th June 2010, 06:33 PM   #249
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Join Date: Feb 2005
Location: Rome, Italy
Quote:
Originally Posted by sonata149 View Post
This thread is getting really interesting with input from designer and knowledgeable members. My contribution is merely to point to an alternative method of obtaining a decently charged +24Vdc SMPS at a much lesser cost. It's on Decibel Dungeon detailing the connection of 2x computer SMPS's. http://http://myweb.tiscali.co.uk/nu...clonesmps.html
Although it's really for +/- supply there are some details on how to obtain +24V supply. I haven't built such a supply but would like to know the reactions and experience of members as to the technical diy aspects of such a project.
I explored the same idea in the past, realizing that it's dangerous, because if the 'response time' of the switching controller on the first SMPS is not *identical* to the 'response time' on the other SMPS, they could start to oscillate... damaging the TP2050 board, themselves or more simply stop working (entering in protection mode).
So I don't suggest you to try that configuration, 2 switching controllers into the same PSU are never a good idea, although I have no doubt that in most cases it works.
Bye!
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Old 18th June 2010, 06:37 PM   #250
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Quote:
Originally Posted by hifimediy View Post
Thanks for all suggestions. here are new ways to tight the heatsink.
[IMG]Click the image to open in full size.2050 heatsink improvement[/IMG]
You added the white spacers to the bolts that retain the heat sink, I'm correct?
Thanks, bye!!
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