PD_P3V3 (C140) or PD_LDO_3V3(C141) output is unstable (ring)

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PD_P3V3 (C140) or PD_LDO_3V3(C141) output is unstable (ring)

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Presentation transcript:

PD_P3V3 (C140) or PD_LDO_3V3(C141) output is unstable (ring)

Symptom: PD_P3V3 (C140) or PD_LDO_3V3(C141) output is unstable (ring) when did the Adapter DC cable or USB cable plug in-out test.(The failure symptom is random) Failure sample: 1 of 200pcs after life test finished.

Power on waveform CH1:CC1; CH2:CC2; CH3:VIN_3V3; CH4:VBUS

Power on waveform CH1:CC1; CH2:CC2; CH3:VIN_3V3; CH4:VBUS CH1:CC1; CH2:SPI_SSZ; CH3:VIN_3V3; CH4:VBUS

Power on waveform after remove R350 Power on waveform after remove R350 and mount R309(0 ohm) CH1:CC1; CH2:SPI_SSZ; CH3:LDO_3V3; CH4:VBUS CH1:CC1; CH2:SPI_SSZ; CH3:VIN_3V3; CH4:VBUS

PD_P3V3 Failure symptom PD_P3V3 waveform Zoom in Note. Measured with offset 3V voltage.

Additional PD_P3V3 waveform and its zoom in (Note Additional PD_P3V3 waveform and its zoom in (Note. The system is working okay under this waveform)