Pwm Ic

[rahulcet]

Iam looking for a PWM ic which generates fixed frequency of about 20KHz with 0 - 100% duty cycle. I need the duty cycle to vary using a pot or some thing say from 0 to 5V.

 

[3v0]

In another thread you are working with a PIC in c ? Why do you need a dedicated PWM chip ? The pic can easily provide that function.

 

[rahulcet]

He he. this is different mate. tell me if I can get two two PWm outputs with two induvidullay controllable duty cycles from one 18F458. can ya do that. thast y i asked this here.
but ur fast to respond danx for that.

 

[KMoffett]

Take a look at TL494. It has two complimentary outputs.

ken

 

[3v0]

He he. this is different mate. tell me if I can get two two PWm outputs with two induvidullay controllable duty cycles from one 18F458. can ya do that. thast y i asked this here.
but ur fast to respond danx for that.

You can get as many PWM outputs as you have IO pins. One software loop that counts from 0 to 100, 20K times per second. Turns on all output with duty cycle greater then 1 at zero, and switches each off when the loop counter is equal to the duty cycle.

Also I am sure there are PICs that can do it in hardware.

 

[rahulcet]

Interesting. i will have a look at that loop that U talked about. Thanks MAte.

 

[3v0]

Interesting. i will have a look at that loop that U talked about. Thanks MAte.

y'l u'r @ it: deep six the phone text and use real english.

 

[rahulcet]

He he .
Ok Mate.
YOU ARE FUNNY.