IRS2092 on breadboard

[savu]

Originally Posted by Eva

The project in which I'm currently working is a big self-oscillating amplifier (>3KW). It uses IR2110. There is a PIC that can gain control over the modulator and drive the output stage. I used it at first as a square wave generator for testing the power stage. Now it works fine but this test mode is still in the code

Hello Eva,

Care to share the name of that PIC?
Because I have heard of people trying to use Atmega 16 chips.
But PIC?
Is it dsPIC series or just a fast PIC with PWM outputs?

Regards,

Savu Silviu

[nigelwright7557]

Originally Posted by rob mullen

Wondering if anyone has built a Class D amplifier based on the IRS2092 using the reference designs from International Rectifier on breadboard? how tricky is it to achieve proper grounding conditions using the breadboard?

I used the datasheet circuit and found it didnt work for me.

After a lot of work I eventually found the 10uf on VCC was too small and replaced it with 47uf and got it working.

On my next design I upped the supply to +/-45 volts and the 2092 oscillated on top of the audio. Again the same capacitor was at fault and i upped it to 100uf.

The 2092 is fussy about decoupling.