TLV3501: Variable frequency and amplitude at relaxation oscillator

Hello Mehmet,

What is the expected frequency range? How much frequency change are you expecting (there are limits). Accuracy limits? LC? Crystal?

How are you expecting to change the frequency? Voltage? Variable cap or pot?

Are you expecting a 50% duty cycle? Or PWM?

The comparator has a digital output - so varying the amplitude requires either attenuating the output or becomes very complicated as the output is usually used as part of the feedback path and can change the thresholds.

This may not be as simple as you think... What is the end application?

 I need a ac square wave with an amplitude of 5V or 10V,  100Hz-5khz frequency and 20-80% duty cycle. 

Hi Mehmet,

TLV3501 has a maximum supply of 5.5V, so the device will not be able to swing to 10V.

Please read this cookbook to see how to implement a relaxation oscillator using a comparator and discrete components: Analog Engineer's Circuit Relaxation Oscillator Circuit

Dynamically changing the swing, frequency, and duty cycle will involve dynamically changing the external passives (capacitors and resistors). As Paul said, this may not be simple to do. Could you please tell us the end application for this relaxation oscillator?