A suitable amplifier for PWM

[tony03]

Hi all,

I need to build a PWM amplifier at 35kHz, I built the schematic with an ideal op amp (I think it is a 741) on OrCAD. However, I think the slew rate of the amplifier is not fast enough, so is there any op amp that can replace it?

Thanks in advance

 

[dr pepper]

An op amp isnt a great thing to use for that, however you might get better results from something like a NE5532, they are a lot quicker, still not great for switching mosfet gates though.
You could put a mosfet gate driver on the output of the modulator, that will improve things and much reduce wasted heat in the fets by slow switching times.

 

[wahlin]

How about DRV103 or DRV104 ?