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TPS53211: FUNCTIONAL BLOCK DIAGRAM

FRANK1
Expert 7895 points
Part Number: TPS53211

Hi sir,

I have a question on LDO of FUNCTIONAL BLOCK DIAGRAM in page 7.

is it still have an output for this LDO?

Does VCCDR pin must be connected to an external power supply?

Thanks,

Regards,

  

  • 0
    TI__Expert 7895 points

    the purpose of my inquiry, I want to confirm when there is a power input on VCC pin, whether I need to add an external power on VCCDR pin or not.

    thx.

  • 0 in reply to FRANK1
    TI__Genius 14455 points

    Hi,

      The VCCDR is the driver VCC voltage. The internal LDO will generate the voltage on VCCDR if no external voltage is supplied.

    Regards,

    Gerold

  • 0 in reply to Gerold Dhanabalan - Online Design Tools
    TI__Expert 7895 points

    Hi Gerold,

    Thank u for your response.

    More inquiries, 

    1.After VCC power supply, LDO has output voltage, which can replace external VCCDR, that is VCCDR no longer needs external power supply.

    Is my understand correct?

    2. In what range can VCC enable LDO normally?

    3. What is the voltage value of internal LDO?

    4. How to use VCCDR with 12v VCC input?

    Thanks a lot.

    Regards,

  • 0 in reply to FRANK1
    TI__Expert 7895 points

    waiting your feedback,

    thanks a lot.

  • 0 in reply to FRANK1
    TI__Guru 52745 points

    M123456,

    1) Yes, your understanding is correct.  After applying power to VCC, the internal LDO is powered and the VCCDR pin does not need to be externally powered.

    2) VCCDR is controlled by both VCC and Enable.  VCC will need to be above its UVLO level (4.1V - 4.4V) as specified in the datasheet, and enable will need to be above its  "HI" level (2.2V)  before the internal LDO is enabled.  The internal VCCDR LDO can be enabled any time the VCC voltage is above it's UVLO (4.1V - 4.4V)

    3) The nominal VCCDR regulation voltage is 6.15V with a tolerance of 5.9 - 6.3V.  I do not have detailed drop-out voltage information for the VCCDR LDO voltage for low VCC voltages.  If you need detailed dropout voltage information, I can look for it.

    4) With VCC = 12V, TI would recommend bypassing VCCDR to GND with a minimum 4.7uF 10V rated X5R or better ceramic capacitor.