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Class D Audio Amplifier IC Forum Discussions

Acherme
Level 1
5 sign-ins First reply posted First question asked
Level 1

Hello, I am using the IRS2452AM in order to make a full-bridge class D amplifier, so I use the BTL mode. However, I don't know what kind of feedback topology is recommended. The IRAUDAMP23 shows how to do a feedback, but the IC is used in half-bridge mode (BTL off, 2 channels). Do you have any solutions ? Thanks in advance.

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Nishanth
Moderator
Moderator 25 replies posted 10 solutions authored 50 sign-ins
Moderator

Hello @Acherme,

You have to keep the two channels independent and make them a full bridge. The BTL mode has a common mode offset, but using two separate control loops does not have it.

Regards,

Nishanth

 

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Nishanth
Moderator
Moderator 25 replies posted 10 solutions authored 50 sign-ins
Moderator

Hello @Acherme,

Thank you for contributing to the Infineon community.

Feedback topology will remain the same for Full bridge BTL mode.

Regards,

Nishanth 

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Acherme
Level 1
5 sign-ins First reply posted First question asked
Level 1

Hello and thanks for your answer Nishanth, unfortunatly it doesn't really help me. 

1.PNG

In the case of the IRAUDAMP23 the feedback signals are taken from the nodes 1 and 2, and they are injected in the node 3. But if I am using a full bridge, what must I do with the signals taken from the other bridge (nodes 4 and 5) ? Should inject them directly to the node 3 ? Or should inject the difference of the two bridges feedback signals by using a substractor like shown in this video https://youtu.be/24sBtnnjK34 ? Thanks in advance.

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Nishanth
Moderator
Moderator 25 replies posted 10 solutions authored 50 sign-ins
Moderator

Hello @Acherme,

You have to keep the two channels independent and make them a full bridge. The BTL mode has a common mode offset, but using two separate control loops does not have it.

Regards,

Nishanth

 

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