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LMR14206: Surge Current at input side.

Sagar Rathod
Prodigy 115 points
Part Number: LMR14206

Hello All,

I am selecting LMR14206XMK/NOPB  IC for my new design.

the design requires the CE qualification so according to that the device should sustain 2KV at input for Live to Neutral and vice versa, for 8/20 uS Surge current.

So the question is if i select the surge diodes (Vcl < Vmax) it will sustain? i have doubt on the SHDN pin if suppose i tied it to VCC then it will sustain the surge?

I had tried on another make IC which have Enable pin limitation for 2V to 6V so it has damaged.

I don't want to fail in the given IC. Please suggest EMI EMC and surge protection ckt if possible or which can sustain the IEC-61326 Standard. 

Thank You.

  • 0
    TI__Guru 50120 points

    Hello,

    I would suggest using a newer device like the LMR43606.

    This newer device has an absolute maximum and ESD rating specified below.  

    Since you are putting a TVS diode on the input, it should protect from surge and should be fixed to the clamping voltage. 

    In this case, make sure the clamp voltage is at most 42V to be within absolute maximum rating datasheet specifications.

    For EMI/EMC, conducted (CE) and radiated (RE) data have been taken for this device and shown from Figure 8-19 to 8-25 in datasheet.

    Please have customer follow EVM PCB layout and suggest typical input EMI filter in datasheet.

    Regards,

    Jimmy

  • 0 in reply to Jimmy Hua
    Prodigy 115 points

    Hello, 

    Thank you for the reply, But for the package and soldering concerns the LMR14206 this one is much easier then suggested.

    also the for the mass production and size constraint of PCB matters. 

    So may i go with  LMR14206?.

    I will add my EMI EMC and surge protection ckt before the IC hope it might sustain.

    should i go with it?

  • 0 in reply to Sagar Rathod
    TI__Guru 50120 points

    Hello,

    Thank you for clarification. It sounds like you want a leaded package device. 

    In that case please continue to use LMR14206 and reference the datasheet for ESD ratings, suggested component selection, and PCB layout guidelines.

    Regards,

    Jimmy