tas5630 mode btl + 2 x se

Armin

the startup of the BTL+2*SE system, like shown on page 20 in the TAS5630 datasheet, is a litle more dificult to get click and pop free, than the pure BTL solution - you should therefore evaluate if you can accept the click and pop. i recomend to get an EVM and modify to try it out.

if possible for you I would recomend to use 2 devices in BTL and PBTL for a 2.1system with supior performance. then you could select a lower power device like the TAS5611APHD, and use one in BTL for the satelites, and use one device in PBTL for the SUB, that way you get a system with good click & pop, excelent power effficiency and lower THD. The penalty is that you need to get 2devices, but its not the double price. next penalty is the use of more output inductors - but the ones that work with the TAS5611A - operating at 35V are much cheaper than the toroids we recomend for the TAS5630.

Back to you questions for BTL+2*SE. yes its output C & D. No they are not inverted to each other, and no you do not need to invert then to each other as they use seperate splitcaps, as shown in the figure 17 in the datasheet. we recomend to use splitcaps values soo big that the midpoint do not move - then you do not get any pumping. calculate the cut off frequency by F=1/(2*PI*Rload*2xC) for the datasheet example with 2x470uF and a 4R load you get a 3dB cut off at 42Hz, so we would recomend to have the cross over at 60-80Hz or higher, then you dont see any pumping at the splitcaps midpoints. if you have a higher cross over like at 150Hz you could use half the size caps for the splitcaps and then a larger for the BTL.

rgds,

Kim N Madsen