Triangle vs. sawtooth for PWM comparator

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rtarbell

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pwm comparator

I was initially taught that when converting a signal waveform to a PWM waveform, a triangle wave was compared to the input signal (via a comparator) and the PWM wave is the output of the comparator.

Why do some PWM ICs use a sawtooth wave instead of a triangle wave? What is the difference?
 

pwm sawtooth triangle

When you use a sawtooth the pwm pulse will be at the begining of the period, but in the triangular wave will be at the center of the period.
 

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