Hi
As a hobby project I am designing automotive audio amp based on TPA3220 D-class amp. What is often happening with this automobile audio stuff is that speakers have quite low impedance (2 ohms or even 1 ohm). I have no concerns regarding 2 Ohm load - no doubt TPA3220 can drive that in PBTL mode. But what about load with 1 Ohm impedance? Product selector tells me that TPA3220 is capable of driving 1 Ohm load
But datasheet (which I trust more) tells that 1.6 Ohm is minimal resistance in PBTL load
On the other hand I understand that mentioned value (1.6) works when PVDD is 30 Volts. So DC current limit shall be 30/1.6 = 18.75 A. For my application PVDD will be at most 15 volts, so that current limit is unlikely to be reached even on 1-Ohm load.
Is there any other limiting factor restricting TPA3220 operation with such low-impedance load? And if no, what should I expect in terms of THD and power dissipation?
