why do the inductor burn out in the IMX6D board?

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why do the inductor burn out in the IMX6D board?

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翔李
Contributor IV

HI,

I debug a IMX6D board,includes a MAX9286 IC to capture 4coax camera 720P25 video in,connect to imx6d by mipi.The camera is powered by the coax calbe means that the cable supply power and video at the same time.

It works well when use VDD_CAM 5V power supply to the coax cable,but when use 12V supply,the inductor 330NH burned out usually.Each camera is 100mA at 12V,150mA at 5V.

As following picture,the burned out inductor L69 in the red part ,and the OK inductor in the green partL69 is ,.LQW18CNR33J00 330NH,630mA.

Why do the inductor L69 burn out? How to debug it?

pastedImage_1.jpgpastedImage_4.png

pastedImage_3.png

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weidong_sun
NXP TechSupport
NXP TechSupport

Hello Li,

    There is something wrong on your schematic, check it again, please!  It should be connected like below:

pastedImage_1.png


Have a great day,
TIC   Weidong Sun

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翔李
Contributor IV

Thanks.

But,what is the difference between your sch and mine?

I find out that your sch. is the same as my sch.

If i change the L69 to more big footprint like 1206 1A ,can it be ok?

I lam ost,and I am so confused.

My cell is +86 13811049846,from China.

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