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TPS701: RESET signal output failure at power-on

TS Yang
Genius 4800 points
Part Number: TPS701

Hi,

I have an inquiry regarding the TI component TPS70151.

The phenomenon is that the RESET signal output is abnormal when the power is turned on.
- see C2 (red) in the waveform below,
- Not set when power is turned on
C1 : /MR1(pin 4) , C2 : /RESET(pin 15)
When re-touch(solder) the Thermal PAD on the back of the part, it works normally.
Question1> Why is the signal line affected by the thermal PAD soldering?
Question2> If the defect occurs, please confirm that it is OK with only the resoldering the Thermal PAD.
Any advice is welcome.
thanks,
TS

  • 0
    TI__Genius 13085 points
    Hi TS,

    Is it possible that the RESET pin was either soldered to the thermal pad or had extra flux creating a leakage path between the RESET pin and the thermal pad?

    As for the second question, yes if resoldering the device and/or thermal pad causes the problem to go away then it should be fine.

    -Kyle