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Old 20th May 2009, 02:20 PM   #41
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My temp findings, so far in normal use it levels off at 55C.
Tripath give typical of 25C and max 70C..
The Sure data sheet quotes that Tripath show thermal shut-down at 150C.?
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Old 20th May 2009, 04:14 PM   #42
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I'd like to thank both Audio1st and Panomaniac for sharing their expertise with us in this thread.

I believe that a good dose of thermal compound (such as Arctic Silver 5) and, perhaps, a better heatsink might solve the issue.

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Old 20th May 2009, 04:39 PM   #43
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For better information on the TC2000 I would suggest reading the datasheet for the TCA2002. They are the same IC (as is the TC2001), the TCA2002 is just an improved version and the datasheet for it was written nearly 3 years later with more detail.

http://doc.chipfind.ru/pdf/tripath/tca2002.pdf

I think the reason it shows BBM timing as 0 is because their MOSFET drivers like TP2050 have built-in deadtime. I would guess it's on the order of >120ns. Im sure you could set it even higher with the BBM settings, but that won't help distortion any.
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Old 22nd May 2009, 08:05 PM   #44
Pano is offline Pano  United States
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Hey Anon. I have been searching thru a lot of datasheets for power output chips - Tripath and DDX, but can't find dead time mentioned anywhere.

Is your 120nS just a "SWAG" or have you measured it or read it somehwere? I'd love to know what it is, but my trusty old 15MHz o'scope is not up to the task. Good for audio, but not fast enough for that sort of work.

Time for a scope upgrade. It's only money, after all.

It may come down to the old audio trade off of heat vs. distortion.
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Old 22nd May 2009, 08:28 PM   #45
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Heh, I was tired and just shooting from the hip. I meant to say power stage and not MOSFET driver anyway.

There is obviously deadtime built into the TP2050, that's why it can work with the TC2000 set to BBM = 0ns. I'm sure Tripath set it a little on the high side for reliability reasons.

I think deadtime is intentionally not mentioned for power stages simply because they already set it internally for what they think the internal FETs require.
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Old 22nd May 2009, 11:48 PM   #46
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I knew what you meant. +)
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Old 23rd May 2009, 01:07 AM   #47
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I noticed that the input impedance of the TC2000 chip is 2K.

What volume pot would anyone suggest?
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Old 23rd May 2009, 01:09 AM   #48
col is offline col  Australia
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Default does this board have a low noise floor?

Could I get some more comment on the s/n ratio on this board? Iv'e read through this thread and the question has been asked before but only one person (audio1st) has mentioned it being "dead quite". What sensitivity speakers are you using it with? Has anyone tried it on 96-106db efficient drivers? I'm looking for something that has the noise floor of a TA2020 but with a little more grunt, 2 x 100w would be perfect.

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Old 23rd May 2009, 01:45 AM   #49
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Quote:
Originally posted by Bearman
What volume pot would anyone suggest?
20K seems to work OK. If your source can do it, used 10K.
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Old 23rd May 2009, 08:57 AM   #50
swkbkk is offline swkbkk  Thailand
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The manual provided by Sure suggests use of a 50Kohm potentiometer for volume control.

Can anyone kindly explain the effects of different ohm values on the potentiometer in plain English that a lame newbie like myself can understand?

How does one decide what value is suitable? What will happen if too higher a value is used? What will happen if too lower a value is used?

I must thank various people on this forum. Without your kind help, I would not have even dreamed of ordering a PCB. I am slowly learning and beginning to enjoy it.

Hmm.... when is my board arriving though?
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