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Only 1st time power on trouble of ADP5052

Question asked by Kaos on May 13, 2015
Latest reply on May 13, 2015 by Kaos

Dear Sir/Madam,

 

Our customer have met the following trouble all ADP5052s on ES process now.

 

After PCB assemble by factory, and power on .

So output voltage is too low voltage.

Ch1 in yellow is supply voltage 12V.

Ch2 /3 in green / blue shows the output voltage.

12V_1R5V_1VRising_abnormal.png

 

But after wait for a few minutes, and power on again , so the correct output have comin.

3 times and 4 times also same result.

12V_1R5V_1VRising_1.png

I put the fail and OK scope pictures here, also enclose the schematic.

Schematic seems good.

Please advice us why this trouble have comin?

 

Thanks Kaos

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