RC4580: RC4580IDR Application support

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See the circuit diagram for details 

Hi Lei,

Thank you for providing the schematic. I have a few follow up questions:

1. Did the part burn out as soon as the power supplies turned on? 
2. When it failed, was anything connected to IO3?
3. Could you include the full photo of the part that burned out? If the damage is visible, this could help determine the cause.
4. Is this a new design, or a design that has been in production for some time? 

Also, I noticed that U1B is unused. We recommend that the unused amplifier should be placed in a follower configuration to keep the amplifier output in a linear operating range. For more details, see the following:

https://www.edn.com/properly-terminating-an-unused-op-amp/

https://e2e.ti.com/blogs_/archives/b/thesignal/posts/the-unused-op-amp-what-to-do

Best Regards,

Alex Curtis

1、Yes ,the part burn out as soon as the power supplies turned on

2、Yes, I connected the electronic multimeter (KEYSIGT 34461A)

3、See the picture below.

4、No, this refers to something that has been in production and use for five years.

Hi Lei,

Thank you for the photo of the failed unit, there is clearly a lot of current flowing through the part to cause it to heat up enough to melt the package.

Given that the part is failing as soon as the power supplies turn on, this could be an EOS issue, but given that I do not see any obvious issues with the schematic and that this design has been in production for five years, I'm inclined to think this is isolated to the device, but more information is needed. 

When the power supplies are turned on, what is connected to the output of the amplifier (what is the load being driven in the circuit downstream of the amplifier in normal operation)?

How many devices in this batch have exhibited this issue (failure rate)?

Have you performed an A-B-A swap with an undamaged unit in the batch exhibiting the issue (2527)? This procedure is outlined here:

Best Regards,

Alex Curtis