TPS2663: IN_SYS power leakage

Hi TM,

I will get back by today eod on this.

Regards 

Kunal Goel

Hi TM,

Can you please share your schematic and block diagram?

Regards

Kunal Goel

Hi TM,

Can you share waveforms for the eFuse which is seeing leakage? 

Please probe VIN,VIN_SYS,VOUT,DRV,SHDN,FLT, PGOOD.

Please make sure SHDN pin is high. 

Regards

Kunal Goel

Kunal, we will do that and feedback to you (maybe next Monday), thanks.

Hi Kunal,

Will SHDN level impact this? Because for leakage channel, pull up may not working at that time. Pull up goes high following the input of that channel.

Hi TM,

If SHDN is low then there can be leakage.

Regards

Kunal Goel

Hi Kunal,

That seems doesn't make sense, per my understanding the SHDN is for eFuse ON/OFF control, which means, if ON (high), power can pass through it, otherwise it blocks the forward path. If not, how can we control the ON/OFF of each channel.

Kunal, please check the waveform I captured.

Hi Kunal,

We tried to pull up SHDN signal, but leakage still can be seen, check this waveform.

Hi TM,

Leakage is reduced to around 2V? I think this is because of external FET drain to source leakage even when it is  off. 

Regards

Kunal Goel

Hi Kunal,

The PD at front end have absorbed some current, so the leakage voltage dropped to around 2V. But if disconnect the connection to PD, leakage voltage is about 19V when +VBUS_SINK =28V.

Hi TM,

We have an internal mail chain going with FAE . I will reply there. Is that fine?

Regards

Kunal Goel