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LMG1020: Is it possible to apply a −250V negative high voltage to the GND pin

seungpum kang
Prodigy 160 points
Part Number: LMG1020
Other Parts Discussed in Thread: UCC33421-Q1, DS90LVRA2-Q1,

Tool/software:

Could you please confirm whether we can apply a −250 V negative high-voltage bias to the GND pin in order to implement a high-speed negative high-voltage transmitter for NDT?

In addition, as shown in the attached schematic, we plan to connect the GND pins of the UCC33421-Q1, DS90LVRA2-Q1, and TPS7A8400 to the same −250 V rail.

Kindly review this arrangement and let us know if any issues are anticipated.

The TX operates at 150 MHz and delivers a negative-unipolar output spanning 0 to −250 V (Vpp).

Each cycle is a single negative impulse that transitions 0 V → −250 V in 3.3 ns and then returns to 0 V.

  • 0
    TI__Genius 15646 points

    Seungpum,

    The primary and secondary ground pins of UCC33421-Q1 can handle 250V/3.3ns. You can check the CMTI specs and the working voltage capabilities of this devices in the DS (see below).

    For support with the other devices (DS90LVRA2-Q1, and TPS7A8400), please update the part number of your e2e thread with those (it is LMG1020 as of now) or if that does not work, submit a different e2e thread with those part numbers.

    Thank you

  • 0 in reply to Manuel Alva Hernandez
    Prodigy 160 points

    Manuel Alva Hernandez,

    Thank you for your response. In that case, could you please check if it is acceptable to connect -250V to the ground pin of the current thread’s part number, LMG1020? Also, is it possible to register DS90LVRA2-Q1 and TPS7A8400 to the current thread? As far as I know, only one part number can be registered per thread. If not, I will create a new e2e thread for them.

    Thank you.

  • 0 in reply to seungpum kang
    TI__Genius 15646 points

    Seungpum,

    Please create different threads (three in your case) for each part number and the respective engineers will reply back to you.

    Regards