HELLO ,

COULD ANYONE TELL ME /EXPLAIN HOW DOES THE DUTY CYCLE OF A PWM(DRV-101) VARY WHEN THE INPUT IS OF VOLTAGE LEVELS BETWEEN 0.75 AND 3.7V( THIS VOLTAGE LEVELS ARE FROM A VOL TO FREQUENCY CONVERTER VFC32).I WOULD ALSO LIKE TO KNOW THE AMPLITUDE OF THE RESULTANT PWM WAVE.

THANKS IN ADVANCE

 

It's the average voltage of the output. You filter out the AC, and you're left with the DC component.

 

THE OUTPUT FREQUENCY OF THE PWM IS AROUND 24 KHZ.....ANYHELP REGARDING THIS WOULD BE REALLY APPRECIATED

 

HELLO BILL,

THANK YOU FOR THE REPLY ,BUT COULD YOU EXPLAIN THAT IN DETAIL BECAUSE I AM A BIT WEAK IN THIS.

 

Many devices, like motors or lights, respond to the average power. I don't know anything about your basic circuit you are refering to, but PWM is basic theory.

Visualize a RC circuit attacted to a PWM circuit, the red lines would show how the voltages would average.

 

The link didn't come through all the way...

http://www.chem.duke.edu/%7Eboris/datasheets/VFC32.pdf

Interesting chippie, almost looks like a 555 a little bit.

I think I'm misunderstanding the OP's question.

 

Hello Bill ,

I was actually referring to the circuit discussed in the following link.

http://electronicdesign.com/Articles/Index.cfm?ArticleID=6168

The link for the circuit diagram is mentioned in the above link but just in case i am sending you the link . Any help about how the o/p of vfc (which is sent as the input to drv 101) affects drv101 and the duty cycle .

 

thank you for the reply.

http://electronicdesign.com/Files/29/6168/Figure_01.gif