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Old 15th May 2012, 12:44 AM   #31
JoelM81 is offline JoelM81  United States
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Quote:
Originally Posted by portreathbeach View Post
In the datasheet, each of the two inputs into the chip has a positive input and a negative input (IN1P pin 9, IN1M pin 8). Can you simply connect your analogue signal to IN1P and connect audio ground to IN1M? or do you need some kind of driver in between the source and this chip?
Connect the ground of the previous stage to IN1M and connect the signal to 1N1P (or vice versa if you want to flip the polarity). Then any differences between the power amp's noisy ground and the previous stage's cleaner ground will be cancelled out, instead of amplified. Of course, there needs to be one solid connection between these two grounds somewhere in the circuit, but it probably already exists at the power supply. What are you amplifying?
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Old 15th May 2012, 02:42 AM   #32
authlxl is offline authlxl  China
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about our mini8950 module, we found some problems from our customers reply, TDA8950 chip burnt when tempreture increase and over current occur in this time, we have burnt lots of chip in testing and repairing,we have got lots of real data of it.

We develop new module of this series chip ,testing now.tda8920cth version(named T2100) have pass test below.

1. full load shorted protect passed,
2. no load full signal out direct shorted protect passed, full signal cap shorted output and inductor shorted output passed.
3.tempreture increase over current protect passed.
4.48hours half load burning passed.
5.pulse signal test passed.
6.square wave test passed.

TDA8950th (named T2150)test going now,

about input pin, IN1M and IN2P connect to signal gnd through one cap + one resister in this series.

We have developed one new series integrated DSP with tda class D chip(T2100D/T2150D), because we found no analog limiter performance better than dsp limiter,it can be works well with larger dynamic range, some of our customer assemble it in live show system, mic and cd signal mixed, amp burnt or tweeter burnt in worst case, but when add DSP unit, it same all fine.

our experiences: good routing and perfect parts value are very important in class D amp, not easy to make single chip larger power level class d amp works stable.

Spent lots of time and money in these series chip,because only this chip have syemmtric dc power supply and can be bridged easily. other single dc power supply chip can be Pbtl , but not easy and protect function not good when shorted out in some case.
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Last edited by authlxl; 15th May 2012 at 02:58 AM.
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Old 15th May 2012, 02:48 AM   #33
JoelM81 is offline JoelM81  United States
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Quote:
Originally Posted by authlxl View Post
about our mini8950 module, we found some problems from our customers reply, TDA8950 chip burnt when tempreture increase and over current occur, we have burnt over one hunderd chip in testing and repairing,we have got lots of real data of it.
We have had problems with this line of chips in our products, too. You have to follow the app notes exactly. Lay out the board the way they say to, use the sil pads and the spring-loaded heatsink the way they say to, etc. etc.
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Old 15th May 2012, 06:54 AM   #34
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Hi JoelM81, thanks for the answer. So I could connect a preamp RCA lead directly to IN1P and IN1M, or should I use a buffer first?
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Old 21st May 2012, 04:04 AM   #35
JoelM81 is offline JoelM81  United States
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Quote:
Originally Posted by portreathbeach View Post
Hi JoelM81, thanks for the answer. So I could connect a preamp RCA lead directly to IN1P and IN1M, or should I use a buffer first?
Yeah, assuming the signal level is correct. If the preamp is grounded to the same power supply as the amp, then IN1P should not be connected to the amp ground, only to the preamp ground. If the preamp is otherwise floating, then it should be.
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Old 3rd June 2012, 06:28 AM   #36
authlxl is offline authlxl  China
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Quote:
Originally Posted by authlxl View Post
about our mini8950 module, we found some problems from our customers reply, TDA8950 chip burnt when tempreture increase and over current occur in this time, we have burnt lots of chip in testing and repairing,we have got lots of real data of it.

We develop new module of this series chip ,testing now.tda8920cth version(named T2100) have pass test below.

1. full load shorted protect passed,
2. no load full signal out direct shorted protect passed, full signal cap shorted output and inductor shorted output passed.
3.tempreture increase over current protect passed.
4.48hours half load burning passed.
5.pulse signal test passed.
6.square wave test passed.

TDA8950th (named T2150)test going now,

about input pin, IN1M and IN2P connect to signal gnd through one cap + one resister in this series.

We have developed one new series integrated DSP with tda class D chip(T2100D/T2150D), because we found no analog limiter performance better than dsp limiter,it can be works well with larger dynamic range, some of our customer assemble it in live show system, mic and cd signal mixed, amp burnt or tweeter burnt in worst case, but when add DSP unit, it same all fine.

our experiences: good routing and perfect parts value are very important in class D amp, not easy to make single chip larger power level class d amp works stable.

Spent lots of time and money in these series chip,because only this chip have syemmtric dc power supply and can be bridged easily. other single dc power supply chip can be Pbtl , but not easy and protect function not good when shorted out in some case.

we have finished t2100/t2150 and t2100d/t2150d modules now, tda8920cth or tda8950th works well, all protection and burning test passed. DSP series have very good dynamic compress performance.
Attached Images
File Type: jpg t2100a.JPG (223.3 KB, 645 views)
File Type: jpg t2150a (2).JPG (214.4 KB, 626 views)
File Type: jpg t2150a.JPG (206.9 KB, 611 views)
File Type: jpg t21002150heatsink.JPG (185.0 KB, 583 views)
File Type: jpg DSCF3542800600.JPG (243.5 KB, 574 views)
File Type: jpg DSCF3534800600.JPG (143.9 KB, 208 views)
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Last edited by authlxl; 3rd June 2012 at 06:34 AM.
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Old 22nd March 2014, 03:33 AM   #37
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what can be the possible cause of the sound intermittent using TDA8950? With lower volume level, the sound is OK but as I increase volume level, the sound stops for about 0.5 seconds then plays again, on and off (periodically) seems like its happening in part of the song where there is a lot of bass and drums.
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Old 23rd March 2014, 03:22 PM   #38
authlxl is offline authlxl  China
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Quote:
Originally Posted by bimdow02 View Post
what can be the possible cause of the sound intermittent using TDA8950? With lower volume level, the sound is OK but as I increase volume level, the sound stops for about 0.5 seconds then plays again, on and off (periodically) seems like its happening in part of the song where there is a lot of bass and drums.
maybe output inductor become saturation,change it with one 10A-15A high DC current suppression inductor, and change PROT cap as smaller.
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Old 26th March 2014, 07:49 AM   #39
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Quote:
Originally Posted by authlxl View Post
maybe output inductor become saturation,change it with one 10A-15A high DC current suppression inductor, and change PROT cap as smaller.
Thanks. Follow up question, why does when I set my volume up to 80 - 100% I get a distorted sound quality. No clipping, no intermittent, but a noisy sound with cracks and pops. The sound output is nice when it is set to 50%.

Another problem is that whenever I plug the AC cord to the mains, there goes a very loud pop noise,. How can I get rid of it.
Thanks for your time..
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Old 10th June 2014, 09:23 AM   #40
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i have a question about this board:

TDA8950 120W+120W Class D Amplifier Board High Power Amplifier Board-in Amplifier from Electronics on Aliexpress.com

pic from aliexpress:
Click the image to open in full size.

the component between the ac-input and the big capacitors is a bridge rectifier, right?

can i desolder it and feed the amp from three sla-batteries in series?
(total voltage is something between 17V and 21V dending on charge)
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