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TPS2662: TPS26622 design calculator

Francisco Fernandez
Prodigy 130 points
Part Number: TPS2662

Tool/software:

Hello,

The TPS26622 calculator doesnt consider the case where UVLO pin is connected to RTN to disable it. R2 and R3 cant be set to 0ohm or removed.

Besides that I would like to understand what is the voltage rating of OVP pin, the datasheet says that is 5V tolerant but absolute ratings table says 4V. Moreover, connecting a 1M resistor between Vin and OVP voltage goes over maximum voltage rating of OVP pin.

Regards

  • 0
    TI__Mastermind 21371 points

    Hello Francisco,

    Francisco Fernandez said:
    The TPS26622 calculator doesnt consider the case where UVLO pin is connected to RTN to disable it. R2 and R3 cant be set to 0ohm or removed.

    I guess you are talking about disabling OVP. Yes, you can connect OVP pin to GND to disable. Design calculator doesn't allow remove the values. 

    Francisco Fernandez said:
    Besides that I would like to understand what is the voltage rating of OVP pin, the datasheet says that is 5V tolerant but absolute ratings table says 4V. Moreover, connecting a 1M resistor between Vin and OVP voltage goes over maximum voltage rating of OVP pin.

    5V is the abs max value of OVP pin. Stresses beyond Absolute Maximum Ratings may cause permanent damage to the device.

    4V is the recommended operating voltage of OVP pin.

    Thanks

  • 0 in reply to Amrit Jit
    Prodigy 130 points

    Hello Amrit, 

    I am sorry but your answer doesn't really solve my questions. While writing my initial post I mixed UVLO with OVP:

    - You say that OVP should be connected to GND? Datasheet says that it must be connected to RNT.

    - Besides that I would like to understand what is the voltage rating of UVLO pin, the datasheet says that is 5V tolerant but absolute ratings table says 4V. Moreover, connecting a 1M resistor between Vin and OVP voltage goes over maximum voltage rating of OVP pin.

    Thanks

  • 0 in reply to Francisco Fernandez
    TI__Mastermind 21371 points

    Hello Francisco,

    Francisco Fernandez said:
    You say that OVP should be connected to GND? Datasheet says that it must be connected to RNT.

    Yes, it must be RTN. Sorry for the confusion.

    Francisco Fernandez said:
    - Besides that I would like to understand what is the voltage rating of UVLO pin, the datasheet says that is 5V tolerant but absolute ratings table says 4V. Moreover, connecting a 1M resistor between Vin and OVP voltage goes over maximum voltage rating of OVP pin.

    I understand the confusion. It's suggested to connect a 1M resistor from VIN to UVLO to reduce the UVLO pin current sinking. But you have to connect a divider along with 1M to make it below 4V. 

    Hope it clears the confusion.

    Thanks

    Amrit 

  • 0 in reply to Amrit Jit
    Prodigy 130 points

    A voltage divider while connecting a 1M  resistor? That is contradicting the datasheet in this case of use, specially Figure10-14

  • 0 in reply to Francisco Fernandez
    TI__Mastermind 21371 points

    Hello Francisco,

     Figure10-14 is correct. You can connect 1M resistor to VIN directly.

    There is clamping diode at UVLO pin which can clamp the voltage below 5V for 60 uA below sinking current.

    Sorry for the confusion before.

    Thanks 

    Amrit