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AMC1301-Q1: How to improve common mode interference

Link Huang
Expert 3405 points
Part Number: AMC1301-Q1
Other Parts Discussed in Thread: AMC1300B-Q1

Tool/software:

Hi Team,

Hope all is well.

The input voltage sampling encountered the problem of common mode interference: the interference signal will be connected from the primary GND of the isolation sampling device(AMC1301QDWVRQ1), causing the DCDC input voltage sampling to be pulled down and oscillate.
The customer currently connected a 470pF capacitor in parallel between the primary and secondary GND of the isolation device to improve the situation.

How can they improve the anti-interference ability of the isolation device? What experience can we share? Thanks!

Best Regards,

Link

  • 0
    TI__Guru 51271 points

    Hi Link,

    It is not clear to me the exact issue at this time.

    Does the customer have scope shots showing the inputs with respect to GND1, or the outputs with respect to GND2? 

    If the issue is common-mode input interference then I would suggest common-mode filtering capacitors from both inputs to GND1. 

    If it is an issue with the isolation performance, the customer could consider transitioning to a device with newer isolation technology such as AMC1300B-Q1.