pwm complimentary output

[max]

hi friends,

how to convert a pic16f870 single ended pwm output to complimentary
output (push-pull type) using discrete logic?

regards
 

[medik]

Hi, to get complimentary output, use two op amp, connect in a way that the pwm output will be connected to the + and - of the 2 op amp while 2.5v goes to the other ends of the op amp. I will upload a picture when i get home.

[borberk]

Change code to have output on two pins in oposite phase or use inverter.

[Ichan]

You need to consider adding dead band control to prevent cross conduction. If you are going to drive mosfets then a mosfet driver like IR2104/84 is a good choice, or change the PIC which have Enhanced PWM feature.

-ichan

[tAhm1D]

Hi max,
You can't have push-pull output with discrete logic from PWM output of PIC16F870. You have to use the compare module in CCP and use interrupt to obtain push-pull output. Or you could implement the whole thing on software using only the timer.