TPS786: when EN shutdown , output still has 0.5V voltage

Haiwen Huang

Part Number: TPS786

Dears :

when customer use TPS 78601, They found when EN shutdown ,output still has 0.5V voltage ,we disconnect all the load ,but still found 0.5V voltage in the output . Could you please help check what happened ? Thanks .

over 3 years ago

0 JCHK over 3 years ago

TI__Mastermind 43630 points

HI Haiwen,

Is there a chance that there is a voltage on PS pulling up VOUT? The TPS786 does not have an active pull-down when disabled.

Regards,

0 Haiwen Huang over 3 years ago in reply to JCHK

TI__Intellectual 1270 points

Hi JCHK:

I tried to cut off all the load and pull up circuit , now the output voltage can as low as 0,26V. still can't meet 0V. Can you please help take a look ? Thanks .

0 JCHK over 3 years ago in reply to Haiwen Huang

TI__Mastermind 43630 points

Hi Haiwen,

If there are other rails in the system that still have power, is there any chance one of the devices powered by another rail is also powered by the output of the TPS786? There could a leakage path pulling up the output voltage.

Does adding a pulldown to GND make the output go to ground?

I hope this gives you some ideas to find the source.

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TPS786: when EN shutdown , output still has 0.5V voltage