Hello, I have 2 TPA 3116s on my prototype board. I have them sync'd in master/slave configuration. I have implemented an output filter with the same values as the one from the eval board (TPA3116D2 EVM). I am using a 24vdc supply. At idle (no signal), my PSU reads around 400mA current draw. When I disconnect the TPA 3116s, the current draw goes down to around 100mA. I measured around 65 deg C on the inductors and on the amps. The switching frequency is 400khz. The signal from the amp looks decent (400khz square wave 0-24vdc); on the output side, I measure around 12vdc (both positive and negative). The current draw seems the same whether I have speakers connected or not. It seems to play fine, and even when I'm playing at max volume, it continues at around a 400mA draw (average). My output inductors are Taiyo Yuden NR6045T100M.
So it seems that the output inductors are sucking up too much power -- but my SPICE simulation shows that the current should be much lower. I'm at a little bit of a loss as why it's so inefficient. Any thoughts on what I should look at?
Thanks!
Chris Deckard
