# REGARDING THE DUTY CYCLE OF PWM

Discussion in 'General Electronics Chat' started by magnolias, Dec 3, 2008.

1. ### magnolias Thread Starter New Member

Dec 3, 2008
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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.

2. ### Wendy Moderator

Mar 24, 2008
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It's the average voltage of the output. You filter out the AC, and you're left with the DC component.

3. ### magnolias Thread Starter New Member

Dec 3, 2008
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THE OUTPUT FREQUENCY OF THE PWM IS AROUND 24 KHZ.....ANYHELP REGARDING THIS WOULD BE REALLY APPRECIATED

4. ### magnolias Thread Starter New Member

Dec 3, 2008
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HELLO BILL,

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

5. ### Wendy Moderator

Mar 24, 2008
20,772
2,540
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.

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Mar 24, 2008
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7. ### magnolias Thread Starter New Member

Dec 3, 2008
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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 .

8. ### magnolias Thread Starter New Member

Dec 3, 2008
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Last edited: Dec 3, 2008