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TPS56A37: MODE pin resistor tolerance

Koshi Ninomiya
Expert 5655 points
Part Number: TPS56A37


Tool/software:

Hi Team,

My customer is considering to use the TPS56A37, and is looking at the application circuit setting for it.
The MODE pin of TPS56A37 is the internal fixed switching frequency setting pin which TI recommends to connect a 1% 52.3k resistor to AGND.

However, the 1% 52.3k resistor is strict. We would like to understand the reason why the 1% 52.3k resistor is required.
Although the TPS56A37 is the fixed 500kHz switching frequency, if the MODE resistor tolerance becomes wider (for example, 5%), will the switching frequency accuracy become wider too?
We would like to understand the relation between the MODE resistor tolerance and the switcihng frequency accuracy.

Best Regards,

Koshi Ninomiya

  • 0
    TI__Genius 12405 points

    Hello,

    I will respond to this between this week and next week.

    Thank you,

    Calan

  • +1
    TI__Genius 12405 points

    Hi Koshi,

    52.3kohm 1% resistor is highly recommended by TI for this Mode pin connected to AGND. This is what is used to detect the Mode and latch on to the 500kHz FSW during Power Up. Using some value other than what is recommended can result in detection failure, incorrect operation etc. This resistor is crucial for operating at the 500kHz fsw. It is recommended to stay within this range for guaranteed operation.

    Hope this helps resolve your question.

    Thank you,

    Calan