GeWa said:
That's the one. My version of the package has a single pad for each group of 3 power pins.
As promised, attached is my version of the PSOP36 footprint for the TAS5261. It's a zipped eagle library file, so you have to unzip it and move it to wherever you store your library files.
Progress update!
I finished the amp late last night and tested it for the first time and... it works nicely 🙂
I was a bit worried at first because there was a very loud hum on my test speaker, but I eventually got that sorted out by disconnecting my iPod from my computer, turning off a few lights, and unpluggin my computer. Apparently my desk is pretty noisy when everything is running. Anyway, with the hum issue fixed I connected the amp to my main speakers and played some songs. With only one channel playing it's hard to comment on how it sounds but my initial impression is that it was pretty nice. It didn't sound distorted, harsh, or fatiguing at all. Obviously the quality of the modulator (TPA2001D1) has a large effect on the sound, so any shortcomings in audio quality could easily be attributed to the TPA2001D1. The quality of the power supply rail also has a large effect on the sound as was discussed earlier, and even with my unregulated 24VDC (but still pretty stiff) one channel of audio sounded quite nice.
One thing I would like to note is the heat dissipation of the TAS5261. I put a small heatsink on the chip that is roughly 1.5 times the size of the package and the heatsink only got a little warm while playing through a 4ohm test speaker and my 8ohm main speaker with around 1W output (my guess based on how loud it was). That's pretty good, but the real test will be with a higher voltage rail, low frequency sine wave, and a 4ohm 300Wrms (real wattage limit) car subwoofer as the load.
I finished the amp late last night and tested it for the first time and... it works nicely 🙂
I was a bit worried at first because there was a very loud hum on my test speaker, but I eventually got that sorted out by disconnecting my iPod from my computer, turning off a few lights, and unpluggin my computer. Apparently my desk is pretty noisy when everything is running. Anyway, with the hum issue fixed I connected the amp to my main speakers and played some songs. With only one channel playing it's hard to comment on how it sounds but my initial impression is that it was pretty nice. It didn't sound distorted, harsh, or fatiguing at all. Obviously the quality of the modulator (TPA2001D1) has a large effect on the sound, so any shortcomings in audio quality could easily be attributed to the TPA2001D1. The quality of the power supply rail also has a large effect on the sound as was discussed earlier, and even with my unregulated 24VDC (but still pretty stiff) one channel of audio sounded quite nice.
One thing I would like to note is the heat dissipation of the TAS5261. I put a small heatsink on the chip that is roughly 1.5 times the size of the package and the heatsink only got a little warm while playing through a 4ohm test speaker and my 8ohm main speaker with around 1W output (my guess based on how loud it was). That's pretty good, but the real test will be with a higher voltage rail, low frequency sine wave, and a 4ohm 300Wrms (real wattage limit) car subwoofer as the load.
Brian,
Congratulations. Does it mean that you could start the shipment of the boards (especially to persons that haven't ordered any parts)? Or you are still in "testing" phase?
Marek
Congratulations. Does it mean that you could start the shipment of the boards (especially to persons that haven't ordered any parts)? Or you are still in "testing" phase?
Marek
I want to do a full power test into a 4ohm load with ~50V supply to be sure that it can handle it. If it passes that I will start shipping the orders for just boards.
Hope the breakin and tests go well. I for one would not want you to ship until you have thoroughly shaken down the design ... but ... I would take my kits anytime you feel comfortable about the performance ... 
I can't really compare how it sounds right now because I only have one channel of audio driving my 8ohm speakers in parallel. I would need to build up another board and evaluate the stereo pair in order to give any reasonable evaluation.
As it stands, I would say the sound quality of just one channel is comparable to what you would get with a Tripath based amp playing just one channel of audio 🙂 The bass sounds a little more round and the highs are a little smoother at the moment. That may change after I've run the amp for more than the hour that it has seen so far.
As it stands, I would say the sound quality of just one channel is comparable to what you would get with a Tripath based amp playing just one channel of audio 🙂 The bass sounds a little more round and the highs are a little smoother at the moment. That may change after I've run the amp for more than the hour that it has seen so far.
Yes, I hooked it up and it can rattle the blinds 6 feet away if I turn it up!
The switching waveform on the scope looks pretty darn good with the 46V supply rail. There's a little bit of ringing that lasts for less than 1/4 the on time of the waveform and the overshoot looks to be less than a couple volts. It's a little hard to tell with my analog scope set at 10V/div.
It sounds pretty good too. At least as good as a subwoofer can sound when it's fed full range audio. Next I'll try some sine waves.
I did some 30 second 40Hz blasts (the output sine wave was about 20V peak to peak on one output, so that's 40V peak to peak across the load) and the tiny heatsink gets hot to the touch but not burning. I think I need to upgrade it before doing any further testing. Even so, I've seen all I need to see and will start putting kits together and will try to get the orders for just boards and cores/wire shipped on Monday.
The switching waveform on the scope looks pretty darn good with the 46V supply rail. There's a little bit of ringing that lasts for less than 1/4 the on time of the waveform and the overshoot looks to be less than a couple volts. It's a little hard to tell with my analog scope set at 10V/div.
It sounds pretty good too. At least as good as a subwoofer can sound when it's fed full range audio. Next I'll try some sine waves.
I did some 30 second 40Hz blasts (the output sine wave was about 20V peak to peak on one output, so that's 40V peak to peak across the load) and the tiny heatsink gets hot to the touch but not burning. I think I need to upgrade it before doing any further testing. Even so, I've seen all I need to see and will start putting kits together and will try to get the orders for just boards and cores/wire shipped on Monday.
No smoke yet! 🙂
I can't turn it up enough to see where it clips because the sub is either crazy loud at the higher test frequency or is oscillating beyond it's xmax (~1").
I can't turn it up enough to see where it clips because the sub is either crazy loud at the higher test frequency or is oscillating beyond it's xmax (~1").
- Status
- Not open for further replies.