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TPSM84A22: Will nearby strong magnet affect module operation?

Tom Tsao
Expert 2010 points
Part Number: TPSM84A22
Other Parts Discussed in Thread: TLV62569

Tool/software:

Hi TI team,

I am using the TPSM84A22 in my design, and there will be a strong permanent magnet placed near the module due to mechanical constraints.

I have few questions:

1. Will the external magnetic field affect the internal inductor, and in turn impact the operation of the power module?

2. If yes, how can I determine the safe minimum distance between the magnet and the module?

3. For TLV62569 (with an external inductor), will the external magnetic field affect the inductor and cause abnormal converter behavior?

Thanks for your support!

Best regards,
Tom

  • 0
    TI__Expert 5818 points

    Hi Tom,

    Regarding TPSM84A22, yes having a strong magnet will affect internal inductor of module, it can affect inductors saturation and inductance. This can cause abnormal behavior like instability, bad regulation and reduced efficiency. Datasheet doesn't provide a safe distance since there is different case scenarios that can affect the location. For sure I'd say to keep at least several cm distance, best way to address this would be to use a gauss meter to measure the magnetic fields, try measuring without magnet and then with magnet, move magnet until you get gauss meter reading close to value when magnet wasn't there. If you cant space the 2 components far enough, you could also look into magnetic shielding to help minimize magnet interference.

    As for TLV62569 I would suggest posting a new E2E so it goes to the correct engineer supporting that device. But most likely any device using inductor will be affected.

    Regards,

    Eileen