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ISO6760: Why ISO6760DWR suffers damage

Jeongin Yang
Prodigy 10 points
Part Number: ISO6760

Tool/software:

Dear TI team,

Testing the input circuit will damage the ISO6760DWR components. I don't know the cause, so I'm leaving a question.

I am using ISO6760DWR parts in the circuit for insulation. The circuit configuration is as shown in the image below.

The input signal to the ISO6760DWR part is configured as the circuit below. The voltage going into the input signal is 72V.

The power source used in the circuit is configured as shown in the image below. It receives the main power supply of 72V and generates 24V, 5V, and 3.3V using a regulator.

Is there a wrong configuration in the circuit?

Thanks.

  • 0
    TI__Genius 17295 points

    Hello,

    Thank you for your question.

    While I review the schematics you have provided, I have some questions regarding the issue you are facing:

    1. Can you please provide some more details on the damage to the device?
    2. Were there any signal transmission issue? if so, please provide waveforms

    Regards,
    Aaditya Vittal

  • 0 in reply to Aaditya V.
    Prodigy 10 points

    Hello,

    Thanks for your reply.

    1. To explain the extent of damage to the device, the input signal was confirmed in the ISO6760DWR part, but the output signal was not confirmed, so it was determined that the part was dead.

    2. Referring to my attached circuit, a signal was input to the ISO6760DWR by receiving an input of 72V, but when checking the waveform, the output signal was not confirmed as in number 1. Sorry there is no image file.

    Is it difficult to determine the cause of component damage based on this information alone?

    Thanks.

  • 0 in reply to Jeongin Yang
    TI__Genius 17295 points

    Hi Jeongin, 

    Thanks for your reply.

    Can you please confirm the voltage of the signal at the INx pins of the ISO6760 device? I would like to make sure that 72V is not the input voltage to the INx pins of the ISO6760 device. the absolute maximum specification for the INx pins is maximum VCC1+0.5V, so 72V would definitely violate this specification assuming that it is directly connected to the isolator.

    Please confirm the voltage at the INx pin on ISO6760 device.

    Regards,
    Aaditya Vittal