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How to drive PWM with output voltage swing of 0 to 625mV

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Hi,

I am controlling some voltage regulator and I need the output of the uC to be a pwm signal at 2khz + and have a voltage output swing of 0 to 625mV. How do I create that?

I'm guessing I need a cap or something like that?
 

You can use a voltage comparator like lm311, supply voltage of 5 Volts, pull up resistor of 10k.

0.625 V = (R/(R+10k))10v

R = 1429 Load resistor
 

why 625 mv only? is it a logic signal or an analog signal? if it's logic, just divide it down with a resistor divider.
 

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