THE TPA3110D2 DATA SHEET MENTIONS THREE TYPES OF OUTPUT FILTERS. FIRST THERE IS THE FERRITE BEAD AND CAPACITOR ON EACH OUTPUT CONNECTION IN THE BTL CONFIGURATION, SECOND THERE IS THE COMMON MODE CHOKE AND A DIFFERENT CAPACITOR ON EACH OUTPUT CONNECTION (COMPONENT VALUES BEING LOAD IMPEDANCE DEPENDENT), AND THIRD IS THE RC SNUBBER TO BE LOCATED CLOSE TO THE CHIP'S OUTPUT PINS. IT IS NOT CLEAR TO ME IF ALL OF THESE FILTERS CAN BE USED AT ONCE OR IF THE FERRITE BEAD FILTER AND LC FILTER IS AN EITHER OR CHOICE. ALSO, I AM NOT CLEAR AS TO HOW TO IMPLEMENT EACH OF THE FILTER POSSIBILITES IN THE PBTL MODE. DO THE COMPONENT VALUES STAY THE SAME AS THOSE FOR THE BTL MODE FOR THE SAME LOAD IMPEDANCE?
IF AN APPLICATION HAS AN UNKNOWN LOAD IMPEDANCE (BETWEEN 4 AND 8 OHMS) HOW DOES ONE DECIDE ON COMPONENT VALUES FOR THE LC FILTER? IF YOU SPLIT THE DIFFERENCE (DESIGN FOR 6 OHMS) DOES IT PROVIDE AN ACCEPTABLE RESULT IF THE LOAD IMPEDANCE TURNS OUT TO BE 4 OR 8 OHMS? THE 22UH SHIP-LOOSE CHOKES PROVIDED WITH THE TPA3110D2EVM SUGGESTS TO ME THAT SPLITTING THE DIFFERENCE MAY BE AN ACCEPTABLE APPROACH.
