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TPS50601A-SP: State if SYNC is pulled high?

Azad Jalali
Prodigy 122 points
Part Number: TPS50601A-SP


Tool/software:

Hi,

We have a board that uses the TP50601A-SP in several places. In our design, when the part is not actively being SYNCed, we want it to fall back to internal oscillator mode. Due to implementation details, the SYNC pin idles high with a 1k pullup. Is this expected to cause issues with internal oscillator mode? There is a note that says that the SYNC pin requires a 10k resistor to ground for this mode to be effective, but I wonder what happens if it is pulled high instead.

Best,

Azad

  • 0
    TI__Expert 5941 points

    Hello Azad,

    I have reached out to our design team with your question.

    Please allow 1 - 2 days for us to look into this.

    Thanks,

    Andy

  • 0 in reply to Andy Fondaw
    TI__Expert 5941 points

    Hi Azad,

    I do not believe there are any major concerns with basic functionality of the device in the configuration you describe (SYNC idling high when no external clock is provided). Our design team, and a brief test with an evaluation board both confirm that the device appears to operate normally in this configuration.

    However, it is important to note that the TPS50601A-SP was not validated, or radiation tested with SYNC pulled high. SEE performance could not be guaranteed in this configuration either, as the test board pulled SYNC to GND through a resistor.

    Thanks,

    Andy