Working of LM 393

Thread Starter

rajeshsura

Joined Feb 25, 2014
2
I gave a PWM to the input of LM393 and did not connect anything at the output. Tried probing the output pins and the o/p stays low instead of an isolated PWM. Does LM 393 require a pull up or pull down at the output...?
 

crutschow

Joined Mar 14, 2008
34,284
I don't understand why looking at a data sheet seems so difficult. :confused: If you look at this you will see that the output is an open collector transistor and that all the application schematics show a pull-up resistor.

Why do you want to apply a PWM signal to a comparator? The PWM signal should already be a digital signal.
 
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