Tool/software:
Hi TI,
I have designed a Class D 240W audio amplifier with TPA3255 in PBTL configuration. I have used two test conditions to measure the power dissipation of class D IC as follows
• Case 1
Vin - 52V
Iin - 6.9A
Pin - 358.8W
Pout Class D - 285.17W
We are using a transformer of 100V and the load resistance is 43ohm and the output of transformer is 240.178W.
The power dissipation in class D is around 73.62W.
•Case 2
Vin - 48V
Iin - 7.16A
Pin - 343.68W
Pout Class D - 284.98W
The output of transformer is 236.769W.
The power dissipation in class D is around 49.57W.
Why the power dissipation in class D IC increased with the supply voltage even though the output from class D is same on both case?
