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Old 20th December 2001, 11:43 AM   #11
sonnya is offline sonnya  Denmark
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Quote:
Originally posted by Petter
You could use the IRF swithes that Crystal use to run their setup at 1MHz ....

Petter
hhh Petter where did you find the use of IRF switches in companion with Crystal chips. I would like to see it!!

By the way i got stuck at the Powersupply. It have to be fast and have a low noiselevel. As well as a low output impedance in a wide frequency range (up to ~ 370KHz).
I wan't to be able to adjust the voltage with a dac. pheeyy! a lot of work.

If this is not okay the design will suffer a lot. ... I think i will go for a low noise ref and opamp with an output stage.

I already have a use for this powersupply (analog preamp and poweramp). So i will concentrate on this designstage.

There will be more on this subject within 2 weeks.

Sonny
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Old 5th January 2002, 05:57 PM   #12
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Go to www.crystal.com and check out their digital amplifier design notes or search for IRF. Alternatively go to www.irf.com and search for Crystal.

BTW the simplest path is to get the TI eval board, solder out the 51?? and replace with say 5112, remove the 4 zero ohm resistors that short out the complementary signals feeding the 5100 output stages.

I believe the board is called 5100 eval board. There is a 2 layer reference layout for this if you want to build it yourself, ideally with discrete output.

I am hopefull that TI will come out with a ref design for the 5015 which is not secret soon. It should be close to the reference design, but you are correct that the power supply at this juncture is the most difficult part to get right. You have to modulate the power supply for volume to get the optimal results.

I would definitely go with the IRF (for Crystal) switching units since they are 1MHz switch freq. rated and matched etc. Then again, the 5100 is easy to work with if you use the reference board.


Petter
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Old 6th January 2002, 08:17 AM   #13
sonnya is offline sonnya  Denmark
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Thanks Petter, but it looks like the ircs8101 and ircs8102 is "under development", i can't find any datasheet on those units. I like them to.

Have you found any datasheets on them?

Sonny
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Old 6th January 2002, 12:39 PM   #14
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I cannot remember whether I did or not. Sorry.

Usually the semi companies make the dies, but wait with the mounting process for several reasons -- a) to make many at one time from order demand b) make in correct housing after they know what people want c) have no inventory themselves (rely on distributors.

It is therefore likely that they have these parts ready and that you might get evaluation chips by contacting them.

Petter
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Old 6th January 2002, 05:27 PM   #15
dc is offline dc
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Default TI 5015 vs. Tripath

I'm on the verge of beginning to build some amps for the Phoenix dipole speakers on linkwitzlab.com. The speaker plans use an active crossover, so I'll need six channels for 2 front speakers and more later, if I decide to complete an HT setup with these speakers.

Based on what I've read, the Tripath seems like the way to go at this time. Although I haven't done the math yet, I think I can put two Tripath 0103A modules in one enclosure for 4 channels at 250W each. So two of these will support the front channels and, if I bridge one of the stereo modules, I think I can use that to power a sub.

How will the sound quality of these TI amps compare with the tripath? Are digitial crossovers really developed to a point where they, in combination with a truly digital amp (like the TIs discussed here) will be noticeably better than a good analog crossover with the Tripath? Does anyone have any information on whether/when Tripath will release the digital input they mentioned when they initially released the Tripath?

Any advice?

Thanks.

brad
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Old 6th January 2002, 05:34 PM   #16
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Default Tripath

I don't believe Tripath are expending much effort on a direct digital to analog amp. They seem to be happy tackling the communications market. This is a shame, really, but we cannot expect Tripath to survive over time in the amp market when they go up against TI, Cirrus and other big guns.

Petter
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Old 6th January 2002, 08:14 PM   #17
arnach is offline arnach  United States
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Default yup

Have to say,

TI samples (department?) has been absolutely outstanding.

-- Aaron
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Old 7th January 2002, 01:56 AM   #18
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Default Re: yup

Quote:
Originally posted by arnach
Have to say,

TI samples (department?) has been absolutely outstanding.
Oh yes... i ordered a THS6012 wide bandwidth opamp to try as a headphone amp after reading Rod Elliots' article and the thing arrived in a *WEEK*... to Argentina, via UPS, in a very tidy package.
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Old 12th January 2002, 06:32 PM   #19
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Default TI evaluation boards...

Looks like TI have an evaluation module for the TAS 5100 in the pipeline . Has anybody considered doing anything with one of these??

-Mark.


tas5100evm
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Old 13th January 2002, 04:29 PM   #20
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Default TI eval module phase 1, 2 and 4

Phase 1: Replace the TAS50?? chip with a higher version -- unfortunately 5015 requires some doctoring since the input is different. Remember to delete the shorting resistors (0 Ohms) hooking up the signals to the TAS5100s

Phase 2: Replace output filter with higher quality unit

Phase 3: Set volume by changing bridge input voltage.


I am not going to try it for a while, but I might if I get access to the layout in a format that I can modify and so use the 5015 and discrete output stage with relative ease.

So little time, so much fun ...

Petter
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