Need an IC for DC to PWM conversion

[Iawia]

Hi,

how can I generate PWM signals (w/o a microcontroller if possible) from a variable dc signal (0-5v) to drive an H-Bridge?

Is there a IC that I can buy that will do it?

 

[shortbus=]

A SG3525 IC will do it. Although it needs 8V-35V for power, it uses 5V (which it provides internally) for the PWM control. It was originally made for switch mode power supplies, but can be used for many PWM circuits.

https://www.google.com/url?sa=t&rct...qd4FCCESR7EAsBXwtMkSq1g&bvm=bv.48572450,d.aWc

 

[canadaelk]

Or the 555! E

 

[alec_t]

Have you seen this?
https://www.electro-tech-online.com/threads/amperage-of-8-aa-cells-connected-in-series.528/

 

[dr pepper]

I recently used a TL494 for the same purpose, it was a pyrography pen for the mrs.
The SG3525 I think is a modern version of the TL494.
I'll dig up the '494 schematic if you want to go with that.

 

[BeerBelly]

This is a very popular IC which is almost always used.

I recently used a TL494 for the same purpose, it was a pyrography pen for the mrs.
The SG3525 I think is a modern version of the TL494.
I'll dig up the '494 schematic if you want to go with that.

 

[ronv]

Or here is one using a comparator.

 

[Iawia]

ok thanks guys. I will look at your wonderful suggestions.