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TPS40210: The Negative pressure output for DC/DC

Zhang Liang
Genius 4275 points
Part Number: TPS40210
Other Parts Discussed in Thread: LM5155, PMP22155

Tool/software:

Hi,

We kick off the project of the laser radar TDA design, the the bias voltage is about 200V, and use the SINK current mode,

we need about 200V negative bias voltage, and your ampliifer team colleague promote to use the TPS40210 and he suggest us to create the new thread for this caes;

We read the datasheet but this is only a positive voltage output, and we can't reverse output circuit because our circuit is Shared ground;

Please kindly provide your commend how to solve this issue, thanks.

The ampliifer thread: https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1438059/lmh34400-the-design-issue-for-lmh34400/5517154#5517154

Our design block diagram:

  • 0
    TI__Mastermind 31210 points

    Hi Zhang,

    Thanks for opening a new thread for this.

    It is possible to achieve negative output voltages with a boost converter by selecting the topology.
    TPS40210 is a suitable part for this, but I would even recommend the LM5155 family, as this boost device is more modern.

    Here is  a reference design for an inverting buck boost design with -250V output voltage.
    https://www.ti.com/tool/PMP22155
    Could you also give me the specs for VIN range and maximum load conditions?

    Thanks and best regards,
    Niklas

  • 0 in reply to Niklas Schwarz
    Genius 4275 points

    Hi Niklas,

    We need the APD bise voltage range is -120V~200V and the current is 5mA, can you help to check if TPS40210 is covered this voltage range

    ( TPS40210 voltage range is 150V~250V), thanks.

  • 0 in reply to Niklas Schwarz
    Prodigy 10 points

    Hi Niklas,

    PMP22155 is specifically designed for APD biasing, which is great. As Mr. Zhang mentioned, the bias voltage needs to be within the range of -120V to -200V. Is it possible to achieve this?

    thanks.

  • 0 in reply to ?? ?
    TI__Mastermind 31210 points

    Hi Zhang,

    Yes, -150V to -200V should definitely be feasible.
    5mA current should also be no problem.
    Does the input voltage match you design as well? (Reference design uses 6V to 40V supply voltage)
    This would fit for both LM5155 and TPS40210 then.

    You can follow the reference design in selecting the external components and only need to adjust the Vcontrol resistors and the compensation, depending on the stability performance.

    Best regards,
    Niklas