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LM48511SQBD: Various questions about my design.

Part Number: LM48511SQBD
Other Parts Discussed in Thread: LM48511

Greetings one and all,

I have recently designed a evaluation board for the LM48511, that caused the smoke to escape.  Currently we are unsure of where the fault lies.  So I had some questions around the design, namely:

The inductor (L1) we are using is the same package as recommended by the data sheet, thou as can be seen from the attached image it is 10uH instead of the 6.8uH that is shown in the data sheets.  Does this have a negative impact, or is the difference negligible? 

Also as can be seen from the image, we are using two speaker connections, CN22 and CN24, to test the difference between a filtering circuit and a none filter circuit.  Unfortunately the smoke escaped before we could get to that part of the testing and I was wondering if anyone had any experience driving it through and transformer like we are doing?

  • Hello Hannes,

    Welcome to E2E, thanks for your interest in our products.
    I have noticed that the input signal level is very high under this condition the device's output will be clipped or even the device could be damaged. The output voltage shouldn't be higher than the boost voltage level in order to avoid this kind of problems.
    On the other hand, you can also disconnect the output filter in order to check a possible problem with that. If the device works well without the filter, it means that there is an issue with the filter.

    Best Regards
    José Luis Figueroa
    Audio Applications Engineer