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TMCS1101: a lightning surge specified by JISC61000-4-5 class 5 is applied to analog input pins(IN+ pins and IN- pins)

Shunsuke Yamamoto
Expert 7681 points
Part Number: TMCS1101

Tool/software:

Hi team.

Good day to you. My customer has been considering TMCS1101 for two-way radio equipment and has a question.

1. If a lightning surge specified by JISC61000-4-5 class 5(It is probably similar to IEC61000-4-5 class 5) is applied to analog input pins(IN+ pins and IN- pins) of TMCS1101, would TMCS1101 be destroyed?

Best regards,

Shunsuke Yamamoto

  • 0
    TI__Expert 5560 points

    Hi Yamamoto-san,

    Section 6.6 of the datasheet has all of our insulation specifications. We are certified according to IEC 62368-1.

    I am not familiar with IEC6100-4-5. The insulation specifications in the datasheet are all that I can guarantee. I am not sure if there is overlap between the IEC 62368-1 and IEC6100-4-5. Our certification might be sufficient for the customer.

    Best,

    Holly

  • 0 in reply to Holly R
    TI__Expert 7681 points

    Hi Holy,

    Thank you for the answer. I understood that we aren't familiar with IEC61000-4-5. I received several technical questions regarding TMCS1101. Could you please kindly help me to answer?

    1. Do we have the waveform image of the surge test of maximum surge isolation voltage? This test may seem similar to the surge test of IEC61000-4-5.

    2. What is the isolation voltage? I am sorry that I am not familiar with isolation.

    3. May I know the countermeasure circuit for TMCS1101 against the lightning surge? My customer plans to use TMCS1101 outside, and it will be affected by the lightning surge.

    Best regards,

    Shunsuke Yamamoto

  • 0 in reply to Shunsuke Yamamoto
    TI__Expert 5560 points

    Hi Yamamoto,

    1. I will need to talk with some colleagues to figure out this information. Please let me get back to you tomorrow.

    2. The TMCS1101 has a high voltage and low voltage side. The high voltage side is the side with pins 1-4 (IN+, IN-) where all the current is flowing through. There is a separation (isolation) between this side and the other side of the IC. Isolation voltage is the maximum voltage that can be seen on the high voltage side. If the high voltage side gets a higher voltage than that then the voltage can affect/damage the circuitry on the low voltage side.

    3. We do not have any countermeasure circuit for this.

    If you are concerned I would recommend looking at our TMCS112x devices. We will be able to provide you with specific surge data from that.

    Best,

    Holly

  • +1 in reply to Holly R
    TI__Expert 5560 points

    Hi Yamamoto,

    I talked with my team and there was no set waveform for this test. They tested many different voltage levels at different pulse widths, but we do not have this specific data about what each of the waveforms was. They will have to look more into the IEC 62368-1 standard to see if this is sufficient for them.

    Best,

    Holly