Here is my latest design for the TPA3106D1. This is an unproven design but no change in the schematics were made since my last attempt, only the layout changed.
Available on BatchPCB
Values of components are:
Values are untested: Use at your own risk !
| RefDes | Description | Qty | Package | Mfg Part No. | Digi-Key No |
| C1,C2, C3,C4, C5,C10, C11,C15 |
CAP CER 1.0UF 25V X7R 10% 0805 | 8 | 0805 | C2012X7R1E105K | 445-1354-1-ND |
| C8,C9 | CAP CER 1.0UF 100V X7R 1206 | 2 | 1206 | C3216X7R2A105K | 445-4467-1-ND |
| C12,C14 | CAP 1500UF 50V ELECT FC RADIAL | 2 | 7,5-16 | EEU-FC1H152L | P10334-ND |
| C13 | CAP CER 10UF 25V X7R 1210 | 1 | 1210 | C3225X7R1E106K | 445-3942-1-ND |
| C16,C17 | CAP CER 1000PF 100V C0G 5% 0805 | 2 | 0805 | C2012C0G2A102J | 445-2320-1-ND |
| IC1 | TPA3106D1 | 1 | 32-LQFP | TPA3106D1VFP | 296-26884-ND |
| L1,L2 | INDUCTOR PWR SHIELDED 33UH SMD | 2 | SPD127 | SPD127R-333M | DN7646TR-ND |
| J1 | CONN HEADER 2POS VERT .250 TIN | 1 | 0.250″ | 350428-1 | A1466-ND |
| J3 | |||||
| J4 | |||||
| SPK | CONN TAB FASTON BRASS .187 | 2 | 63982-1 | 63982-1-ND | |
| R5,R6 | RES 100K OHM 1/4W 1% 0805 SMD | 2 | 0805 | ESR10EZPF1003 | RHM100KAECT-ND |
| R7,R8 | RES 20 OHM 1/2W 1% 1206 SMD | 2 | 1206 | RNCP1206FTD20R0 | RNCP1206FTD20R0CT-ND |
Why did you choose to use a 1500uF cap instead of the 220uF which was used in the app notes?
Also how come your 1nF caps are rated for 100V?
The 1nF caps are four (4) times the maximum voltage (4 x 25). This is worse case senario and was also preferred for the price, at the time, the 100v version was cheaper in required quantities.
The link to the Eagle files seems broken (I get an empty “Download” page).
Of course, it’s possible to reverse engineer the circuit and to match it to the reference design from TI, but it would be easier to build the circuit from the Eagle files.
Thanks Yann, I just fixed it
Hi
I really loved the short para on your website about “BS driven development”, it is so true!!!!!
the next amazing thing that I found was the compact PCB layout of TPA3106. This IC has huge potential and somehow is neglected by R.W.O completely. Since you have posted eagle files on diyaudio. com and on your website, would you mind if I alter them as per my need and fabricate PCB out of them? I would love to share the eagle file with my other AudioHolic friends.
thanks
Sure, go ahead. I’ve made more improvements but this version still works very well
Thank you so much!
Ok, now that you say that you have updated the design, I am very curious to see the picture of new layout. If possible, please post pictures of new PCB.
thanks.!
Sure, the updated version is on Upverter; I’ve uploaded the Eagle files directly up there. You can see it here: https://upverter.com/plaguemorin/485ba37db6ac2773/MiniAmp/#
Looks very neat and better than previous version! If its alright with you, please pm your email id.
Thanks!
Oops! I paid little attention and found it. sorry for the trouble. Will email you soon. thanks
OSH Park won’t allow holes within 15 mils of the board edge, but maybe they could be cvnnioced to look the other way. I tried what you did above too and had a flap of copper left on each hole, which I suppose is slightly better, but still not good enough.