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Old 25th January 2005, 07:36 PM   #1
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Default Help with HIP4082

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
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Old 25th January 2005, 08:55 PM   #2
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Hi,

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

Thanks
Chris
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Old 26th January 2005, 03:39 PM   #3
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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
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Old 26th January 2005, 10:39 PM   #4
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Connect two more mosfets and use it full bridge and dc offset should cancel.

Add an error amp and apply feedback.
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Old 29th January 2005, 07:35 PM   #5
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Thank you
I will try
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