Hello again,
thank you for your replies.
This seems to be a big problem for many of my modules, hence I would like to share more data.
@schmitt trigger:
Due to the current compliance of the HMP4040 power supply it cannot draw 0.5A.
@FvM:
Yes, we measure both, the LDO and cap. And yes, a resistor in parallel to the cap is what I meant.
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Anyway, I am not sure if the caps are the problem, because the same effect did also happen with different LDOs (LDK130M-3) that use
different/smaller caps (1uF) at the input and output.
Attached you can find a description of the module. It seems, that some of the LDOs break after some hours of operation.
So, I am looking for reasons. I also thought about kind of a chain reaction. If one LDO breaks, it kills the others ?
The datasheets of both LDOs (TPS7A7001 and LDK130M-R) deal with stability issues.
I am very thankful for any hint/idea/thought/...
Thanky very much.
-e
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View attachment MIMI_CTRL_LDO_problems.pdf