Electrical – Which IC produces PWM that can be filtered into sine wave?


For a DC to AC transformerless power supply, I am trying to find a specific type of IC that produces PWM that can be filtered into sine wave.

What I can find in most websites is an MCU that has to be programmed to produce such PWM.

I am wondering is there any off-the-shelf IC that available so that I don't have to do the MCU programming.
I don't need fancy PWM, just a single purpose IC that produce PWM which can be filter into a sine wave.

To be more precise, the square wave pattern I’d like to generate is shown below:

enter image description here

Best Answer

If you begin with an analogue sine wave (basically an oscillator like a Colpitts or phase shift type), you can adjust it's amplitude to 1 volt peak to peak and feed it into an LTC6992.

  • Pulse Width Modulation (PWM) Controlled by Simple 0V to 1V Analog Input

The LTC®6992 is a silicon oscillator with an easy-to-use analog voltage-controlled pulse width modulation (PWM) capability.

enter image description here

\$R_{SET}\$ adjusts the oscillation frequency of the PWM.