LM4675SDBD: 1-1LK937I]

Sylvia Allison

Part Number: LM4675SDBD

On this request to determine if they would be willing/able to perform testing on failed devices from this request to determine “… if the defect is regarding the static damage or is it electrical overstress”?

over 7 years ago

0 José Luis over 7 years ago

TI__Mastermind 20085 points

Hi Sylvia,

Welcome to E2E, thanks for your interest in our products.
I don't understand very well your request, could you please give us further information?

Best Regards
José Luis Figueroa
Audio Applications Engineer

0 Sylvia Allison over 7 years ago in reply to José Luis

Prodigy 110 points

After reviewing the attached FA report, the customer is requesting assistance from TI in evaluating failed samples to determine the level of damage in order to determine possible root cause of short originating from either EOS or ESD.

0 José Luis over 7 years ago in reply to Sylvia Allison

TI__Mastermind 20085 points

Hi Sylvia,

You mentioned attached FA report, but it seems that you forgot to add it. Could you please add the FA report?
I have another question, Did the customer get the chips directly with TI or with a TI's authorized distributor?

Best Regards
José Luis Figueroa
Audio Applications Engineer

0 Sylvia Allison over 7 years ago in reply to José Luis

Prodigy 110 points

Final Report has been submitted.

thank you,

QEM-CCR-1710-00128.pdf

0 Sylvia Allison over 7 years ago in reply to Sylvia Allison

Prodigy 110 points

I have submitted the request to the originator. ask soon as I receive a response. I will let you know.
thank you,

0 Sylvia Allison over 7 years ago in reply to Sylvia Allison

Prodigy 110 points

I have received a response from the originator: These components were sold to Creation from Avnet, to build on our customer boards. Creation mounts the chips on a PCB, and then ships the assembly to our customer. The customer mount the board into a system.
We have had discussions with our customer because we do not do a compete functional test on their board and they are finding the failed components when they perform a system functional test.

0 José Luis over 7 years ago in reply to Sylvia Allison

TI__Mastermind 20085 points

Hi Sylvia,

The FA conclusion mentions that there is no evidence of a systemic issue with the device or this particular production lot.
Please send me schematic and PCB layout If you need an additional review of your application.

Best Regards
José Luis Figueroa
Audio Applications Engineer

0 Sylvia Allison over 7 years ago in reply to José Luis

Prodigy 110 points

the customer provided the schematic layout

I was able to get a snapshot of the schematics for amplifier circuit.

The customer is hesitant in providing the full schematics due to their policy with intellectual property.

I believe the snapshot should be sufficient.

0 José Luis over 7 years ago in reply to Sylvia Allison

TI__Mastermind 20085 points

Hi Sylvia,

I can't watch the snapshot, perhaps there was a problem when you upload the picture. Could you upload it again?

Best Regards
José Luis Figueroa
Audio Applications Engineer

0 Sylvia Allison over 7 years ago in reply to José Luis

Prodigy 110 points

0 Sylvia Allison over 7 years ago in reply to José Luis

Prodigy 110 points

Hi Jose,
I'm not able to submit the schematic on this website.
do you have an email address to send the picture?

Please advise,

0 Sylvia Allison over 7 years ago in reply to Sylvia Allison

Prodigy 110 points

I was not able to load the picture. Can you provide an email address so I can submit it to you?
Please advise,

0 Sylvia Allison over 7 years ago in reply to Sylvia Allison

Prodigy 110 points

RE TI Support Failure Analysis SR #1-3480588050 SCAR 50780 THREAD ID 1-1LK937I.msg

0 José Luis over 7 years ago in reply to Sylvia Allison

TI__Mastermind 20085 points

Hi Sylvia,

I can only see one detail in your schematic if you are going to use an output filter, you should use an LC filter. You can refer the following application reports: Filter-Free Class-D Audio Amplifiers and Class-D LC Filter Design to find further information about designing an output filter. But I don't think that this is causing your issue.

Best Regards
José Luis Figueroa
Audio Applications Engineer

0 Sylvia Allison over 7 years ago in reply to Sylvia Allison

Prodigy 110 points

the customer has some issues before this is closed:

As we requested, the failure analysis was to determine if the problem was related to ESD or EOS.

The recent information provides great feedback on the signal to the speaker, recommendation for filtering but it does not answer the question whether the damage is related to overstress of the component or static damage.

I certainly appreciate your time and help for all that has been done. I am not sure if I will get verification of the true cause of the failure.

Please advise,

0 José Luis over 7 years ago in reply to Sylvia Allison

TI__Mastermind 20085 points

Hi Sylvia,

If you think that the problem could be caused by ESD to use transient voltage suppressors (TVS) could be a solution or if you think the problem is caused by EOS, you should make sure that the IC is subjected to a current or voltage that is beyond the datasheet specification limits of the device.

Best Regards
José Luis Figueroa
Audio Applications Engineer

0 José Luis over 7 years ago in reply to Sylvia Allison

TI__Mastermind 20085 points

Hi Sylvia,

I haven't heard back from you I'm assuming you were able to resolve your issue. If not, you just post a reply or create a new thread if this thread has locked due to time-out.

Best Regards
José Luis Figueroa
Audio Applications Engineer

Audio

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LM4675SDBD: 1-1LK937I]