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TPS2H160-Q1: How to use this IC

Taroimo
Intellectual 680 points
Part Number: TPS2H160-Q1
Other Parts Discussed in Thread: TPS22950-Q1

Dear TI team

 

I would like to ask you about the following four questions.

 

①Is the following order correct for starting up the high-side switch?

 

  1. Supply +5VDC power to VS pin
  2. DIAG_EN pin: L→H
  3. IN1: L→H

              IN2: L→H

  1. OUT1: 5V output

              OUT2: 5V output

 

② Regarding pull-up resistors for OUT1/2 outputs The data sheet "8.3.6.2.2 Channel Off" describes the recommendation of external pull-up resistors.

Is it correct to attach separate 20kΩ PullUp resistors to OUT1 and OUT2?

 

③ST1 may drop to "L" if the high-side switch is activated while a USB memory is connected to OUT1.

Please let me know if there are any possible factors for this phenomenon. (By the way, this phenomenon does not occur when the OUT1 USB is not loaded.)

(High side switch: OFF→ON (OUT1 load: Yes (USB memory connected), OUT2 load: No (USB not connected)))

 

➃It has been confirmed that when the power is turned on with no load connected to the OUT2 USB, ST2 will fall to “L” once.

Please let me know if there are any possible factors for this phenomenon.

(High side switch: OFF→ON (OUT1 load: None (USB not connected), OUT2 load: None (USB not connected)))

 

 

Best Regards,

Taroimo

  • 0
    TI__Mastermind 32650 points

    Hi Taroimo,

    What is the application here? Is there any specific reason that a high side switch is used in this application vs a load switch like TPS22950-Q1?

    There are various faults that could trigger during operation. These are listed in Section 8.3.5.3 in the datasheet. Without seeing a waveform or having a schematic, my initial thought is that the current limit is being triggered during startup due to downstream capacitance.

    It is required to use a 20kOhm pull up per channel for off state open load detection.

    The correct operation for this device is that VS is provided with supply voltage (this device is built for the 12V automotive space), then all I/O pins are correctly set like DIAG_EN, SEL and SEH. ILIM is previously set as well. Then the INx pin is triggered high and the corresponding OUTx rises up to the VS voltage. For more information, a typical application is shown in Section 9 of the datasheet.

    Thanks,

    Shreyas

  • 0 in reply to Shreyas Dmello
    Intellectual 680 points

    Hi Shreyas,

     

    Thanks for your confirmation.

     

    The application is a load switch between microcontroller and USB memory.

    OUTx of this IC is assigned as VBUSx of USB.

    Is the recognition that the Open-load Detection function of this IC is not suitable for USB correct?

     

    Best Regards,

    Taroimo

  • +1 in reply to Taroimo
    TI__Mastermind 32650 points

    Hi Taroimo,

    This device is built for the automotive power market and I am not certain what the limitations for the USB connection are. 

    If automotive compliance is not required, I would recommend looking into TI's selection of UBS switches. This is handled by a different product group.

    https://www.ti.com/power-management/usb-power-switches-charging-port-controllers/overview.html

    For the best support on this topic I recommend tagging one of these products in a new question so that an engineer from the team will respond quickly and with more accuracy.

    I apologize for the inconvenience but thank you for your interest in Texas Instruments devices.

    Best,

    Shreyas

  • 0 in reply to Shreyas Dmello
    Intellectual 680 points

    Hi Shreyas,

     

    Thanks for your confirmation.

    I have another question, so I'll start another thread.

     

    Best Regards,

    Taroimo