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fzabkar
 Post subject: Re: power problem ADATA SU900
PostPosted: August 5th, 2018, 18:29 
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One thing you might like to try is to disable U6 by shorting its enable pin to ground.

Quote:
Enable

When input voltage is greater than the undervoltage lockout threshold (UVLO), typically 2.3V, MP2162 can be enabled by pulling EN pin to higher than 1.2V. Leaving EN pin float or pull down to ground will disable MP2162.

Then see if the other voltages are stable.


Attachments:
MP2162_AZ_app_cct.gif
MP2162_AZ_app_cct.gif [ 18.83 KiB | Viewed 5937 times ]
MP2162_AZ_pinout.gif
MP2162_AZ_pinout.gif [ 14.75 KiB | Viewed 5937 times ]
MP2162_AZ_pin_definitions.gif
MP2162_AZ_pin_definitions.gif [ 35.16 KiB | Viewed 5937 times ]
Reg_1V5.jpg
Reg_1V5.jpg [ 110.26 KiB | Viewed 5937 times ]
Reg_1V5_resistors.jpg
Reg_1V5_resistors.jpg [ 57.05 KiB | Viewed 5937 times ]

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lasek
 Post subject: Re: power problem ADATA SU900
PostPosted: August 6th, 2018, 11:20 
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After disabled MP2162 current is still not stable and still changing in every points. I marked capacitors connected to 1.5V point.


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fzabkar
 Post subject: Re: power problem ADATA SU900
PostPosted: August 6th, 2018, 17:24 
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When you grounded the enable pin of U6, did its output remain at 0V? If not, then it must be faulty.

Otherwise I'm out of ideas.

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lasek
 Post subject: Re: power problem ADATA SU900
PostPosted: August 7th, 2018, 2:30 
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No, after grounded enable pin still showing changing current between 0,1 to about 2,2V but not 0V.
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fzabkar
 Post subject: Re: power problem ADATA SU900
PostPosted: August 7th, 2018, 2:47 
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Either U6 is faulty, or there is an open feedback resistor. See R1 and R2 in the application circuit.

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lasek
 Post subject: Re: power problem ADATA SU900
PostPosted: August 7th, 2018, 3:09 
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sorry where is resistor R1 and R2 ?
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fzabkar
 Post subject: Re: power problem ADATA SU900
PostPosted: August 7th, 2018, 3:28 
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See attachment.


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Reg_1V5_resistors_feedback.jpg
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lasek
 Post subject: Re: power problem ADATA SU900
PostPosted: August 9th, 2018, 10:23 
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Thank you fzabkar for your help. Unfortunately I don't resolved this case.
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arvika
 Post subject: Re: power problem ADATA SU900
PostPosted: August 10th, 2018, 14:14 
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This case probably can be solved, so hope you redirect client to another lab.

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