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TPS552892-Q1: TPS552892

Giora Eytan
Expert 1265 points
Part Number: TPS552892-Q1
Other Parts Discussed in Thread: TPS552892, LM2611, LM5157, , LM63635-Q1

Hello,

I am looking for a schematic - using the TPS552892-  converting positive voltage (12V) to a Negative Voltage (-15V) .

Regards,

Giora

.

  • 0
    TI__Guru 65470 points

    Hello Giora,

    The TPS552892 is a converter that is converting from positive voltage to positive voltage. In general it might be possible to use the part for a negative output voltage, but then you need to connect GND to -15V and make sure that any signal that gets to the device is referenced to -15V and not GND.

    Dependent on the current, you might be able to use LM2611.

    Of you could use LM5157 in flyback configuration.

    But in any case to recommend the right part, please share the input voltage range and the output current needed.

    Best regards,
    Brigitte

  • 0 in reply to Brigitte
    Expert 1265 points

    Brigitte,

    Thanks.

    1. I need an Automotive qualified device.

    2. Input range: 10 - 14V

    3. Output Range: -15 +/- 0.5V @ 3A

    4. I tried to simulate the device using TI TPS552892_Encrypted spice. See attached.

    TPS552892.pdf

    Simulation output.pdf

    Regards,

    Giora

  • 0 in reply to Giora Eytan
    Expert 1265 points

    Brigitte,

    Thanks.

    1. I need an Automotive qualified device.

    2. Input range: 10 - 14V

    3. Output Range: -15 +/- 0.5V @ 3A

    4. I tried to simulate the device using TI TPS552892_Encrypted spice. See attached.

    TPS552892.pdf

    Simulation output.pdf

    Regards,

    Giora

  • +1 in reply to Giora Eytan
    TI__Guru 65470 points

    Hello Giora,

    Sorry for the late response, I was not accessible and assigned the communication to me by accident. Please excuse me.

    Your simulation schematic needs some update as you referenced the IC to the negative output, but several components on the input side to the VOUT (your GND symbol). You need to reference all signals that are connected to the converter to the GND level of the converter, otherwise you might even damage the converter.

    Please be aware that the ground potential of your board is -15V in the outside world. Everything needs to be referenced to the -15V on your board. Then you regulate from 10-14V to -15V (hopefully).

    Best regards,
    Brigitte

  • 0 in reply to Giora Eytan
    TI__Mastermind 27910 points

    Hi Giora,

    TPS552892-Q1 is the four MOSFETs integrated buck-boost converter to converter from positive voltage to positive voltage. To generate the negative voltage rail, please refer to the below app note for inverting buck-boost topology.

    https://www.ti.com/lit/an/snva856b/snva856b.pdf

    Please post a new thread including automotive buck device like LM63635-Q1, so the experts from Buck team will recommend the most suitable device.

    BRs,

    Bryce