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TPS92641: TPS92641 power supply question

Robin Liu
Intellectual 1950 points
Part Number: TPS92641

Hi team,

please help with my customer's question as below.

For the TPS92641, because there is a 12V bias power supply on the customer board. So the customer ask, could they supply the VIN with the 12V and don't connect the HV power input with the VIN pin?

is there any risk with this solution?

Regards

Robin Liu

robin-liu@ti.com

  • 0
    TI__Mastermind 28655 points
    Hello Robin,

    From a Colleague:

    "VIN must be supplied through the highest power line in order to function correctly.
    However, the 12 V can be connected to VCC to reduce power loss due to the internal LDO."

    Best Regards,
  • 0 in reply to Irwin Nederbragt
    TI__Intellectual 1950 points

    Hi Irwin,

    thanks.

    the customer intention is that they don't want to connect the system HVIN to the VIN pin directly, so they want to check, could they use the 12V as the highest power line to connect to the VIN to generate the Vcc and the device internal bias supply?

    Any risk as this method?

     

    Regards

    Robin 

  • 0 in reply to Robin Liu
    TI__Mastermind 28655 points
    Hello Robin,

    From a Colleague:

    "VIN must be supplied through the highest power line in order to function correctly.
    However, the 12 V can be connected to VCC to reduce power loss due to the internal LDO."

    They can use 12V to supply Vin if the power stage is also supplied with 12V. If the power stage is powered by higher voltage than 12V then the Vin needs to be tied to that as well. 12V can be applied to VCC to generate VCC.

    Best Regards,
  • 0 in reply to Irwin Nederbragt
    TI__Intellectual 1950 points

    Hi Irwin,

    Thanks. can you give a explain on this?

    "They can use 12V to supply Vin if the power stage is also supplied with 12V. If the power stage is powered by higher voltage than 12V then the Vin needs to be tied to that as well."

    1. because the power path go throw the external MOS, so could they only connect the highest voltage to the MOS?

    2. if connect 12V to Vcc, could they float the VIN pin?

    Regards

    Robin Liu

  • 0 in reply to Robin Liu
    TI__Mastermind 28655 points
    Hello Robin,

    No, 12V can be tied to VCC but Vin needs to be tied to the highest voltage of the design (the power going to the power stage (the drain of the high side MOSFET). Tying 12V to VCC will reduce the bias power the TPS92641 needs to dissipate but Vin needs to be tied to the high voltage node.

    Best Regards,