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Preference of one circuit over another

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kiwi101

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Hey guys

In order to get a PWM signal I have chosen to use the second circuit with the Schmitt Trigger and Comparators. However the 555 timer circuit is also a valid method to obtain a PWM Signal. My question is are there any drawbacks of the 555 timer circuit so that I may explain why I chose to go with my circuit implementation. I have to make a Pugh matrix for these circuits so in terms of flexibility, cost, implementation which one do you guys think is better, and why?
The only point I have right now is that I need a 200kHz signal and since the frequency is large the second circuit is easy to go with. Is this a valid assumption or no?

Thanks guys.
 

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