Question about issue of ADG453 related power supply condition

Hello,

My customer uses ADG453 supplying +12V (DP12V) at VDD and -12V (DN12V) at Vss like below schematic.

And when -12V trip out, L2 is damaged and ADG453 become hot.

At this time, current of L2 is 1.25A.  (At normal operation, current of L2 is 0.08A.

Q1) Would you confirm the power supply circuit in above schematic?

Q2) Would you let me know why L2 and ADG453 is damaged when  -12V trip out?

       Or would you confirm the power supply circuit in above schematic in case of removing -12V part?

Please advise me.

If you have any questions, please let me  know.

Regards,

Se-woong

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  • 0
    •  Analog Employees 
    on Jun 30, 2015 3:51 PM over 5 years ago

    Hi Se-woong,

    I'm not sure the issue here has anything to do with the switch and is more likely an issue with the power supply. What components are generating the +/-12V rails? What do you mean when you say the -12V rail is tripping out? Are the abs max ratings on the ADG453 being exceeded when the power supply is misbehaving?

    I would suggest the inductor on the ground trace may not be a good idea. This might be causing issues, or if the -12V rail is misbehaving it could be exceeding max ratings on the ADG453 and causing damage due to latchup.

    Rgds,

    Paul

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  • 0
    •  Analog Employees 
    on Jun 30, 2015 3:51 PM over 5 years ago

    Hi Se-woong,

    I'm not sure the issue here has anything to do with the switch and is more likely an issue with the power supply. What components are generating the +/-12V rails? What do you mean when you say the -12V rail is tripping out? Are the abs max ratings on the ADG453 being exceeded when the power supply is misbehaving?

    I would suggest the inductor on the ground trace may not be a good idea. This might be causing issues, or if the -12V rail is misbehaving it could be exceeding max ratings on the ADG453 and causing damage due to latchup.

    Rgds,

    Paul

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