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Class D Switching Power Amplifiers and Power D/A conversion

TI TPA3255EVM
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Old 8th November 2018, 11:37 PM   #831
Peterma is offline Peterma  Australia
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Join Date: Jan 2009
Location: From London to Sydney Feb 69
I'm sorry to have to post this but I think buyers should be aware of my experience in the last couple of weeks with Connex, I have sent them emails regarding info of the aux pin-outs on both amp and smps and they just don't reply or they say that my emails go to their spam, their products are good but if you have any problems you are on your own.
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Old 9th November 2018, 12:41 AM   #832
wushuliu is offline wushuliu  United States
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Location: Pacific NW
That's been an issue since they, well he, started. Though I haven't heard any complaints in a long while. Their products are usually well documented and well designed enough to not need support. But yeah, he used to have these periods where it took a long time to get replies. It's a one-man operation far far away so support is the weakest link..
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Old 12th November 2018, 01:32 AM   #833
dwk123 is offline dwk123
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Has anyone tried running a pair of EVM boards as PBTL monoblocks with higher impedance speakers? The datasheet doesn't cover PBTL for 8 ohm loads, and extrapolating from 4 ohm I'd guess there probably is little to no difference from BTL, Maybe splitting the output current across 4 inductors rather than 2 has some minor benefits, but I guess I'm also curious about there being a penalty due to mismatches between channels.

I'm considering this since I'm still not sure whether I want to go active on my desktop monitors or not. A 2 EVM setup would allow me to do PBTL monoblocks, but if I decided to go active I could revert to BTL for 4 total channels. Even at full price for the EVMs, this isn't an overly expensive settup.
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Old 12th November 2018, 02:28 PM   #834
mboxler is offline mboxler  United States
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As I understand it, and someone please correct me, is that in PBTL, the load on each amplifier/lc filter is identical to SE, not BTL. In other words, when wired BTL, each amp sees half the load, when wired parallel each amp sees twice the load, when wired PBTL you are right back to the speaker load.

Mike
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