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TPS5110 DRV Pin Oscillations

Craig Rettew
Intellectual 965 points
Other Parts Discussed in Thread: TPS5110

I'm using the TPS5110 in my circuit to wakeup my MCU every 1 hour. Both PWR_EN and DONE are connected to separate momentary switches that are normally open. When pressed, it ties the signals to +VBAT_IN. When none of the switches are pressed, I'm getting a 10hz square wave on the DRV pin. Any idea why I would get getting this?

  • 0
    Intellectual 965 points
    Anyone? I've done more testing with this and it seems that this part doesn't react well to transients. Granted my power supply is older than I am and might have so issues but it starts oscillating as shown when I get a funky power up, maybe a spike of current. Just an observation.