I am using a MAX9744 Class-D amplifier and want to get a sine wave in the output. Someone suggests using an LC low-pass filter for this, and in the datasheet of the amplifier, the values for inductors and capacitors are provided. When I constructed the circuit (I attached the schematics), the output was a high-frequency triangular wave, not a sinusoid. The input is 100-1000 Hz sine wave.
Why is this happening? Is it not enough to build an LC filter circuit in the output of the class-D amplifier to get a sine output?
What else do I need to add/change to get a sine wave?
The circuit from the datasheet, I used the values of L and C for 4 Ω load. The inductors that I use are the color ring inductors 0307 1/4 W of 0.47 uH, the image is attached.