So I've been recently trying to build a simple class D amplifier, I've seen through the block diagrams and design considerations online, but recently came across an Amplifier design which doesn't seems to fit the majority of the circuits online. So in the input stage we use a comparator to modulate the input audio signal to PWM. But the circuit below doesn't seem to include any triangle wave generator or comparator circuitry. The circuit is from an Infineon tutorial, there isn't any explanation either. Here is the link to the PDF file which contains the circuitry. It would be helpful if someone explained how this is supposed to work in general, the idea behind these components. Thanks ![Screenshot (289).png Screenshot (289).png](https://forum.allaboutcircuits.com/data/attachments/299/299613-34711582697d1b5a70b0f35ff3da8e46.jpg)
![Screenshot (289).png Screenshot (289).png](https://forum.allaboutcircuits.com/data/attachments/299/299613-34711582697d1b5a70b0f35ff3da8e46.jpg)