Help with HIP4082

[Peter_ma]

Hello. I am a beginner in studying class D amp. I want to make a basic class D amp with less power consumption (no dc offset voltage at speaker). Finally, I used HIP4082 .

However, there is always a dc offset voltage (about 5v) at the input of low pass filter. Then, I had tried to change some connections in order to reduce the offset voltage. It was not be successful.


Could anyone have suggestions --- how to change the connections to minimize dc offset voltage .
Thank you very much.

HIP4082 Datasheet

 

[classd4sure]

Hi,

Can you post a schematic of what you'd done?

Thanks
Chris

 

[Peter_ma]

Thank you your reply.

But the schematic had not been drawn. Sorry.

The circuit is simple. I use LM361 and HIP4082 together. The output 1 and output 2 of LM361 are out of phase. Both are connected to the pin3 and pin4 of HIP4082 respectively.

I connect two NMOS to pin14 and pin16 of HIP4082, according to the figure in the datasheet of HIP4082.

The output voltage of a LPF had about 6V dc offset voltage.

datasheet of LM361

 

[classd4sure]

Connect two more mosfets and use it full bridge and dc offset should cancel.

Add an error amp and apply feedback.

 

[Peter_ma]

Thank you
I will try