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Part Number: TPS56C215
When the Vin=12V and EN pin floating, the EN will have 5V output.
This will cause the system sequence influence by this rail.
Do you have any ideas why the EN pin will have 5V output?
We already make sure EN pin didn't connect to anything else.
I don't think this pin have 5V output is acceptable.
Can you check on the EVM?
The EN pin floating is high and two pull-up current source generated internally, The impendence to ground of the probe may impact the test result.
I will check later, you can double check from my comment.
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In reply to Yuchang Zhang:
Do you have further comments on it?
I am not sure how to check your comments.
If I don't use probe how to measure the waveform?
Besides, the probe's resistance is Mohm level, I don't think it will be a concern here.
In reply to Kuan Wei Chen (Kevin Chen):
I mean because there is internal current source, when go across different impendence, it will generate different V.
I will try to get more with design team next week.
Kevin, checked with designer, the internal current source comes from ~5V source generated from Vin, but tolerance is a little bigger, about ~20% variation.
Also as I talked, the current source(tolerance shown in datasheet EC table) x impendence of EN to ground will impact the test result.
So based on all, you data should be acceptable.
Kevin, I will close this thread, if you have more query, you can call my phone again.
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