Hello,
I am using a LM555 to build a PWM circuit. I configured the chip as per the PWM application circuit in NE555 datasheet (fig 18, circuit for pulse width modulation).
input frequency = 72KHz
C5 = 0.01u F
RA = 4.7K ohm
The circuit works OK between 50-90% duty cycle, but at lower duty cycle the capacitor charges up more than once per clock cycle.I tried different conbinations of clk freu and RA, but it doesn't seem to be able to solve problem
What is the reason for this? Is there a combination of the above parameters that can provide a stable PWM between 10-90%
Thank you for the help