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duty cycle and frequency for PWM generator with 555 timers

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Jdarshan_25

Jdarshan_25

Joined Aug 30, 2024
1
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crutschow said:
Below is a circuit similar to the one in post #8, but uses the LM339 to generate the sawtooth, eliminating the 555:

The top sim shows the frequency changing from about 10kH to 100kHz for a Freq input of 0 to 3V.
The bottom sim show the PWM duty-cycle varying form 0% to 100% for a DC input of 0V to 3.5V.

Its stability/accuracy is also affected by the V+ supply voltage, so may need a stable regulator for that, if the available supply voltage is not sufficiently stable.

View attachment 328764


View attachment 328763
Click to expand...
Sorry to ask silly question, but can you please explain mathematical design. i want to update the design for 0-5V for 1-10kHz for variable duty cycle.
 
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