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Original question:

TPS65094: The Buck issue for TPS650940

TPS65094: The TPS650940 technology issue

Zhang Liang
Genius 3560 points
Part Number: TPS65094

Tool/software:

Hi,

I have submiteed the issue on the other the thread and the link as below:

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1388720/tps65094-the-buck-issue-for-tps650940/5325281?tisearch=e2e-sitesearch&keymatch=TPS65094#5325281

Now, our end customer feedback to us the blow:

1.8A sinking and rsmrst dropping, high-frequency interference was measured in the output of pin56/LDO5 (supplying drv power to pin8/buck2+drv power to pin38/buck1&6).

Disconnecting LDO5 and directly connecting it to 5v of pin57 can also measure high-frequency interference,


From the perspective of action time, the abnormality of "drv power supply" is earlier than standby power such as 1.8A, 1.24A, VNN, etc,


May I ask, besides standby electricity, what else can cause abnormal RSMRST?

  • 0
    TI__Expert 5325 points

    Hi Zhang,

    RSMRSTB is only set to go low when any of the signals for the checked columns go low. 
    Are they able to capture these signals too ? (VSYS, PMICEN, THERMTRIPB, VNN, V1P24A)

    + The noise is a bit concerning. I was trying to look at the full schematic from the previous thread that you linked, but it appears very small. 
    Are you able to send a higher resolution image/pdf of the full schematic so I may take a closer look at the system connections and component values? 

    Thank you,
    Sarah