TPS610986: MODE LOW,VSUB?

Hi Kevin,

I think it may not an expected behavior of TPS61098.

There are several things I want to check,

what is connected with MODE pin? Is it a MCU IO pin or some other things? 

Is there any load on VMAIN?  Is VMAIN a stable 3.3V?

 Regards,

Nathan

hi:

 1. what is connected with MODE pin? Is it a MCU IO pin or some other things? 

   MCU IO.

  2.Is there any load on VMAIN?  

  yes

3.Is VMAIN a stable 3.3V?

 yes

Hi Kevin,

So what the load current from VMAIN?

And more, in condition 2 and condition 3, MODE are both logic low level, but the VSUB conditions are different, what the setup differences between this two conditions?

Nathan

hi Nathan:

 1. So what the load current from VMAIN?  

    normal:  50 mA,   standby:60 uA.

2.And more, in condition 2 and condition 3, MODE are both logic low level, but the VSUB conditions are different,

    what the setup differences between this two conditions?

     The difference is that customers want to know why?

Hi kevin,

Ok, I knew, sorry that I got something wrong about your question before.

So does this mean that customer tried several chips and some chips get high level but some chips don't get, or that customer only tried one chip and sometimes get high level but don't get high level other times?

kevin.huang_FJXM said:

some VSUBs have charging and discharging waveforms, and some have high levels.

Regards,

Nathan

hi Nathan:

total 6000 PCS,MODE PIN LOW,  57% VSUB PIN    LOW or charging and discharging waveforms,   43%   VSUB PIN HIGH.

Hello Kevin,

As we did not hear back from you, I expect the issue is solved and I will close this thread. If you have further questions, please post below or start a new thread.

Best regards,
Brigitte