LTC7001-Noise voltage

Hi all, I am using LTC7001 with N channel mosfet.While everything is okey, The LTC7001 sometimes does not work and probobly it breaks.I change the LTC7001 with new one but after a while it that is changed breaks.I searched that why it does not work but I couldnt find a reason. I think that it breaks because of high noise voltage signal but I dont know because of this reason.In my working zone has noise voltage that is between 1 and 3 volt.Does this noise voltage cause like this breaking ? if I give noise voltage to ground line of LTC7001, will it break ? do anyone have an idea or know about this subject  ? 

thanks,

Bulent

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  • +1
    •  Analog Employees 
    on Nov 25, 2020 11:31 PM 2 months ago

    Hi

    Is there any ceramic bypass capacitor at the VCC pin to filter out the noise?  Does your design have a Schottky diode connected to TS pin?  See diagram below.  Could you provide your design schematic and any noise waveforms?

  • Hi, Thank you for reply. I use 0.1u F ceramic bypass capacitor at the VCC pin to GND.I have a Schottky diode at the TS pin and I used extra bidrictional schottky diode at the VCC line and ground line and  I used ferried bead at the ground line but altough I used this protections,the ltc7001 still breaks, I cant understand why I see this stiuation.I measured the noise voltage and I saw AC voltage 50 HZ, 300 Vpp. How can I protect the LTC7001 from noise voltage ? Do you know special technic for this IC. 

    thank,

    Bulent

Reply
  • Hi, Thank you for reply. I use 0.1u F ceramic bypass capacitor at the VCC pin to GND.I have a Schottky diode at the TS pin and I used extra bidrictional schottky diode at the VCC line and ground line and  I used ferried bead at the ground line but altough I used this protections,the ltc7001 still breaks, I cant understand why I see this stiuation.I measured the noise voltage and I saw AC voltage 50 HZ, 300 Vpp. How can I protect the LTC7001 from noise voltage ? Do you know special technic for this IC. 

    thank,

    Bulent

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