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Class D Switching Power Amplifiers and Power D/A conversion

TPA3255 - all about DIY, Discussion, Design etc.
TPA3255 - all about DIY, Discussion, Design etc.
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Old 27th February 2016, 07:06 PM   #11
Jensen567 is offline Jensen567  United States
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I tend to test with laptop bricks because I have a couple laying around, and in the event I did screw up wiring something it will likely be less severe than if I had 48v and a bunch of current going in. I am not saying to run it off of one long term by any means.

That said, thanks for the tip on "rectifiers", seems much cheaper than buying a "power supply". Funny how changing a word can raise the price up. Haha
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Old 27th February 2016, 07:11 PM   #12
doctormord is offline doctormord  Germany
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it's not the voltage that kills, it's the current. So using some kind of fuse would be a lifesaver.
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Old 27th February 2016, 07:29 PM   #13
gmarsh is offline gmarsh  Canada
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Quote:
Originally Posted by xrk971 View Post
Thanks for the tip on the "Rectifier". I suppose two can be put in series for dual rail supply? 34 amp output sounds kind of nuts. How is that even possible?

Definitely something to keep in mind. This thing is lethal though.
I designed a 48V/100A rectifier into something in the past. Beyond that point they're generally paralleled up but I've seen bigger.

Anything's possible, you can buy DC supplies that go into the kA.
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Old 27th February 2016, 07:30 PM   #14
gmarsh is offline gmarsh  Canada
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Series-ing them up should be possible, usually their outputs float allowing then to be used for -48V or +48V operation. Check the data sheet though.

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Old 28th February 2016, 12:48 AM   #15
Lo_Tse is offline Lo_Tse  Canada
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Quote:
Originally Posted by doctormord View Post
Never seen a 36-50V laptop supply .

But yeah, the expanded voltage range is a nice bonus even when not going for full output power spec.

OT:

Except that, is your job 90% work at 10% money as well?

Chinese culture is, to my knowledge, let others do 90% of r&d and then take over the efforts for the rest of the 10% work.

But that's how the world is working today. Get everything for nothing.
C'mon doc, we heard your rant on this topic many times already. And this "cheap Chinese goods vs. high quality stuffs" has been debated way too much already. You may think your comment is amusing but a lot of people feel your comment is borderline on insulting. The western world is a free market economy, the consumers buy whatever they want to buy. Different products have different buyers. We all know that. If one believe he/she is making quality stuffs and yet nobody is buying, that person should rethink why the market is not responding. May be that product is not what the market wants.

Lets get back on the topic.
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Old 28th February 2016, 01:34 AM   #16
doctormord is offline doctormord  Germany
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OT:

We're do I insult people? Prosperity on the costs of others is the "western worlds" way. This ain't meant to be funny but the truth. Of course everyone can source their stuff wherever he/she wants to.

If it gets the job done, fine. But I can't get behind the fact that ppl buy cheap stuff to mod the hell out of it just to get an (subjective/objective) improvement for higher costs than getting something "better" at first. And it's a true fact that a lot of stuff from I.e. China is developed by someone else and then get flooded to the market at a super low price made with no care for environment and subsidized by the Chinese government. Even Kickstarter campaigns get copied and mass produced even before they finished founding. Is this something you would call "proper" business? To me, it's a bit disconcerting.

I mean, there are so many different 3118/3116 amp boards on the market, almost every single version lacks in some point and ppl complaining about performance, hum, hiss etc.

This at least isn't true for the latest Samwhu boards, from what I'd read.

Even the Iraud copies fail at some point or don't work like intended, but actually are just copies of the reference designs.

For the rest, I'm out as I don't have any products to sell.

So yeah, let's get back to topic.
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Old 23rd June 2016, 05:28 PM   #17
cloud1972 is offline cloud1972  United Kingdom
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i would of thought that given the tpa3255's same pin out as the tpa3251 that they would of produced a evaluation board by now.
also ti and mouser have no stock of this chip are stockist all sold out?
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Old 23rd June 2016, 05:30 PM   #18
doctormord is offline doctormord  Germany
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Default tpa3255

Not available to the public yet. But I heard that some people got samples already.
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Old 5th July 2016, 10:44 PM   #19
doctormord is offline doctormord  Germany
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Go go gadjet 3255.

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Old 15th July 2016, 03:55 PM   #20
jencelo is offline jencelo  United States
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@doc: Do you plan to make 3251/55? I think including me, there are people waiting to buy but at Chinese prices jk
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