Problems about ma5332ms overcurrent protection

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ghostwolf
Level 1
Level 1
5 sign-ins First question asked Welcome!
Thank you very much for answering my question!
 
According to the official PDF, two kinds of circuit boards are produced
 
One is differential input mode. In this mode, everything works normally. The schematic diagram is as follows:
差分输入.jpg
 
The second input mode is single ended input mode (in fact, it is also a differential signal, in which a group of differential signals are input respectively from the two negative terminals of the amplifier). In this mode, the amplifier is easy to enter the overcurrent protection state, while in the same or higher volume, the two groups of differential input mode will not have overcurrent protection at all. The schematic diagram is as follows
单端输入.jpg

What is wrong with the second input mode? Cause the amplifier to enter the overcurrent protection state frequently

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1 Solution
Liz
Employee
Employee
10 replies posted 10 likes given 25 sign-ins

Please check if  the AMPSUB+ and AMPSUB- signals are refer to the GND. If it is floating, it could trigger the OCP.

 

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2 Replies
Nishanth
Moderator
Moderator
Moderator
100 solutions authored 10 likes given 100 replies posted

Hi @ghostwolf ,

Thank you for contributing to the Infineon community.

You are experiencing a problem with over-current protection, whether it is in the hardware or in simulation.

Please provide us with CSD pin waveforms for both input mode to understand the issue better.

Regards,

Nishanth 

Liz
Employee
Employee
10 replies posted 10 likes given 25 sign-ins

Please check if  the AMPSUB+ and AMPSUB- signals are refer to the GND. If it is floating, it could trigger the OCP.