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ISOW1432: Placement and Routing

Abhishek Garg
Prodigy 40 points
Part Number: ISOW1432

Tool/software:

We are using multiple ISOW1432 ICs in our design and similar ICs with similar Technology. We have space constraint and we placed these ICs as shown in attached images placed immediately adjacent to or on opposite sides of each other on the PCB but we are concerned about magnetic coupling and switching noises between them. We need to understand the magnetic field generated from the ICs and also what will be the ideal placement considerations and also minimum clearance required for the placement of these ICs.

Also we want to know about the Ethernet transformers if they have been placed in same manner.

  • 0
    TI__Expert 7655 points

    Hi Abhishek,

    Thanks for reaching out. Please find my inputs below:

    The ISOW1432 can be placed in top-down configuration as shown in your layout. The ISOW1432 is a robust device for EMC performance and is immune to other ISOW1432 noise interference.

    Abhishek Garg said:
    We are using multiple ISOW1432 ICs in our design and similar ICs with similar Technology

    If you mean to say any other integrated power converter IC is being used  in the system, then please check for it's Radiated Immunity levels to be sure of no functional failure.

    Abhishek Garg said:
    Also we want to know about the Ethernet transformers if they have been placed in same manner.

    Apologies, but this query was not clear to me. If you mean to ask something related to ethernet devices then please post the query separately by selecting the particular TI device you are using.

    Regards
    Varun
  • 0 in reply to Varun Kumar
    Prodigy 40 points

    Thanks varun for your response,

    Please also share some documents or test reports which supports your answer regarding EMC performance of ISOW1432 ICs.

  • 0 in reply to Abhishek Garg
    TI__Expert 7655 points

    Hi Abhishek,

    Currently there are no test report to be shared publicly but the recommendation to use it in this configuration comes from following data points:

    1. ISOW1432 is a low emission device which meets CISPR32 Class B mask with emissions levels below 37dbuV/m and has radiated immunity levels of 15V/m which has been tested and verified. 

    2. We've also seen the same upside down positioning of ISOW1432 devices getting used before in other end user application and has never seen an EMC issue being raised in the system.

    Regards
    Varun