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LM5122: LM5122 : SW of Negative is out of spec.

Tom Su
Prodigy 10 points
Part Number: LM5122

Hi:

   Confirm that the negative voltage of SW of LM5122 is -5V
   However, the waveform tested from Spec. is -10V (as shown below)
   -10V is out of spec., Is there any problem?

  

  • 0
    TI__Expert 3280 points

    Hi Tom,

    Thanks for reaching out. I suspect this was caused by measuring with a long oscilloscope probe, which would cause a measurement error with such a high frequency.
    Notice that in figure 44 of the datasheet, the switch node is not falling below -5V.

    Thank you and best regards,
    Bryan