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ADuM5201 DC/DC input filter

Question asked by Mack on Oct 14, 2015
Latest reply on Oct 16, 2015 by bkennedy

Hello,

 

Below is power flow of my ADuM5201 design.

To reduce EMI from DC/DC inside ADuM5201, I made an attempt to add T filter just ahead of ADuM5201.

The result was as follows:

  - Much heat was generated from LDO. It was hot.

  - Data transfer via ADuM5201 was not correctly working.

 

Why does LDO generate much heat when a filter is added, especially an inductor?

There is no problem when ADuM5201 is removed out even though a filter is added.

 

ADuM5201 DC-DC.PNG

Best Regards,

Mack

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