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TPS62745: Working with a pure resistive load and a small current (30uA), it will be unstable.

Kevin Huang8
Genius 4515 points
Part Number: TPS62745

Hi Team,

Powered by DC power supply,
The voltage input is 6.1V; the load resistance is 82KΩ, see attachment SCH for details.
The current value of 8Pcs and 6Pcs will be unstable, please see the attached video for details.
The other 2Pcs current is stable, changing only 1uA at 26uA.
Please help analyze what is the reason?

TPS62745.pdf

  • 0
    TI__Expert 7320 points

    Hi Kevin,

    The schematic looks good.

    Could you please test the waveform of SW(DC couple) and output voltage(AC couple)to see if there's any unstable low-frequency oscillation?

    If SW and output voltage is stable, I don't think there's any risk.