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Specifications for comparator of class-D amplifier

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Comparator of Class-D

While designing a class-d amplifier for audio application, what are the specifications of the comparator we should keep in mind.
 

Comparator of Class-D

I think that rail-to-rail input is not the requirement, because the gain of the PWM modulator is decided by VCC/Vtri, if Vtri is not from rail-to-rail, we don't need a rail-to-rain input.
 

Comparator of Class-D

low offset, bigger gain. Also pay attention to SR
 

Re: Comparator of Class-D

sunking said:
low offset, bigger gain. Also pay attention to SR
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I think bigger gain is very helpful, but I don't konw the exact value, could you please tell me how much is enough?
 

Re: Comparator of Class-D

I think response time is also extremely important (especially with faster switching speeds) and hysteresis to prevent multiple triggering caused by noise.
 

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