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why inductor burn out in the coax circuit of IMX6D?

Question asked by 翔李 on Nov 19, 2017
Latest reply on Nov 21, 2017 by 翔李



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?