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TPSM41625: Question about stand-alone Mode

Austin Do
Expert 4115 points

Part Number: TPSM41625

Hello team,

I have some questions from the customer. Can you please answer the below? 

1. In stand-alone mode, by setting 78.7kohms, but if there is no external clock, would the device operate with frequency set by RT?

2. In stand-alone mode, if external clock be stopped, and then would the device operate with frequency set by RT again? (initially external clock -> after sufficient time, no external clock)

3. What is the range of 78.7kohm?

4. What is the difference of operation between 78.7k and 187k? Is it just due to noise depending on the output?

Best Regards,

Austin

  • 0
    TI__Expert 7320 points

    Hi Austin,

    Due to US holiday, please kindly expect a reply by Wednesday.

  • +1
    TI__Genius 17115 points

    Hello Austin,

    My answer to your questions 1-4:

    1. In stand-alone mode, by setting 78.7kohm, The device will be configured in SYN function. When synchronizing, the external clock signal must be applied to the SYNC pin before the device reaches its VIN UVLO threshold. In a stand-alone configuration, the external clock frequency must be within ±20% of the frequency set by the RRT resistor. This device does not support the dynamic application or removal of an external SYNC signal. If the external SYNC signal is removed, the device treats this as a clock fault and stops power conversion. Refer to section 7.3.6 in the datasheet.
    2. The same as above,  This device does not support the dynamic application or removal of an external SYNC signal. If the external SYNC signal is removed, the device treats this as a clock fault and stops power conversion.
    3. The recommended range is 1%.
    4. The only difference in operation between 78.7kohm and 187kohm is that 78.7kohm will be recommended for reduction of noise for lower VOUT range as in the datasheet.

    Please let me know if this answers all your questions,

    Thank you

  • 0 in reply to Calan Elaya
    TI__Expert 4115 points

    Hi Calan,

    Well noted.

    Thanks for your reply.

    Best Regards,

    Austin