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TPA3255 Reference Design Class D Amp GB
TPA3255 Reference Design Class D Amp GB
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Old 7th September 2019, 07:57 PM   #141
xrk971 is online now xrk971  United States
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TPA3255 Reference Design Class D Amp GB
Thanks. H3 dominant and alternating odd even. Magnitude appears to be -90dB. Can you tell us what is voltage rms and load impedance?
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Old 7th September 2019, 07:59 PM   #142
doctormord is offline doctormord  Germany
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10Vrms into 5R0.

H1/H2 is 95dB
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Old 23rd September 2019, 03:07 AM   #143
xrk971 is online now xrk971  United States
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TPA3255 Reference Design Class D Amp GB
I finally had some time to do some SMT soldering of this amp. The top side SMT parts are all done, now need to flip over and solder the TPA3255 and a few more ancillary resistors and caps.

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Old 23rd September 2019, 03:19 AM   #144
Vunce is online now Vunce  United States
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TPA3255 Reference Design Class D Amp GB
Nice SMT solder work, Looks real good X!
Looking forward to your progress on this Class D.
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Old 23rd September 2019, 04:25 AM   #145
xrk971 is online now xrk971  United States
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TPA3255 Reference Design Class D Amp GB
Thanks, Vunce!

Here is the bottom side with the TPA3255. Also a shot of the closeup on the TPA3255 pins with my microscope.

TPA3255 Reference Design Class D Amp GB-img_2226-jpg

TPA3255 Reference Design Class D Amp GB-img_2224-jpg
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Old 23rd September 2019, 11:58 AM   #146
xrk971 is online now xrk971  United States
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TPA3255 Reference Design Class D Amp GB
I just realized I forgot to order the mating Molex connectors! I only have the PCB side.
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Last edited by xrk971; 23rd September 2019 at 12:02 PM.
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Old 23rd September 2019, 01:56 PM   #147
doctormord is offline doctormord  Germany
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Don't forget the crimp contacts.
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Old 23rd September 2019, 03:01 PM   #148
vacuphile is offline vacuphile  Netherlands
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Looks good. I am in southern Europe until the end of the week and will start assembly next week.
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Old 23rd September 2019, 03:31 PM   #149
xrk971 is online now xrk971  United States
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TPA3255 Reference Design Class D Amp GB
Quote:
Originally Posted by doctormord View Post
Don't forget the crimp contacts.
Me forget to get crimp contacts, and miss a chance to play with my crimp tool collection?!

Click the image to open in full size.

The new microscope was not needed for assembly (except for installing the barely visible polarity markings of the little LEDs) - but made double checking the solder joints a breeze. Under magnification, formerly beautiful reflow joints all look kind of ugly. Cold solder joints are easy to spot with a scope though.

TPA3255 Reference Design Class D Amp GB-microscope-xrk-jpg
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Last edited by xrk971; 23rd September 2019 at 03:39 PM.
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Old 23rd September 2019, 03:57 PM   #150
doctormord is offline doctormord  Germany
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Well, I crimp almost all stuff with my "Engineer" PA09 / PA21 crimp pliers. (Low power)
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