This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS65400 WebBench Error

Other Parts Discussed in Thread: TPS65400

Hello

I'm Alber as an FAE in Arrow Korea

My customer try to get a optimized schematic using TPS65400, but there was an error message.

Following is their their wanted in/out spec.

 

Vin_min : 15V

Vin_max : 15V

 

Vout1 : 3.7V / 4A

Vout2 : 4.7V / 4A

Vout3 : 3.3V / 2A

Vout4 : 3.8V / 2A

 

Why there was occurred error message?

Can they use these output spec at TPS65400?

How to solve this WebBench Error?

  • hi, Alber

    I will test and reply you later.

    BR,

    zhao

  • Hi, Alber

     

    it is the ambient temperature limit the this design, please change the ambient temperature to 0 degreeC and take a try.

    so the SW1~4 work max loading at the same time, the IC would trigger OTP.

    BR,

    zhao

  • Hi, Zhao

    Thank you for feedback.

    And I have another one question.

    My customer will use following setting

    Vin : 15V

    Vout1 : 1.0V

    Vout2 : 1.0V

    Vout3 : 1.2V

    Vout4 : 1.8V

    In this case, they will use the 'current sharing mode' at SW1 and SW2.

    But the WebBench could show only each channel.

    How can they get a schematic of Compensation block? C and R value....

    And How can they test the current sharing mode on WebBench?

    Thanks.

  • Hi, Alber

    When using current sharing mode for SW1 and SW2, the COMP2 terminal must be tied to VDDA through a 4-kΩ resistor.
    And please use same component for SW1 and SW2, the match well, the better for averaging current.
    Compensation circuit (R and C) are same with NO current sharing mode, so you can use the R & C value when SW1 and SW2 output independently.

    zhao
  • Hi, Zhao

    Thank you for your feedback.

    if they use under current sharing mode at SW1 and SW2, how could be connected the ENSW2 Pin? should be open or pull-up through register?

    Customer are using ENSW1 Pin and ENSW2 Pin tied to VDDD through 4.7k ohm register.

    is there any problem?

  • Hi, Alber

    When SW1/SW2 pair output are shared, should set the ENABLE_PIN_CONFIG register to single ENABLE mode, see the page28 of datasheet.  

    After the ENABLE_PIN_CONFIG is set to single ENABLE, SW1 & SW2 output will be both controlled by ENSW1 pin, IC will ignore ENSW2 pin voltage, which means the ENSW2 pin floating, connected to GNDA, or connected to VDDD, it is all OK.

    thanks.

    zhao

  • Hi, Zhao

    Thank you for your feedaback.

    Then, is this impossible using current sharing mode without I2C host control?

    Attached is customer's schematic.

    Please check it.

  • hi, Alber

    I have checked the TPS65400 EVM.

    1. When current sharing, it is not necessary to set single ENABLE by I2C control.

    I have checked the customer configuration in EVM, it is no problem, connecting the ENSW1 and ENSW2 pin to VDDA through pull-up resistor(10kohm) can achieve SW1 & SW2 current sharing. 

    2. the R & C compensation circuit for COMP1 is OK.

    3. BTW, by default, the SSx/PG1 pin is configured to softstart function, which means connecting a capacitor between SSx/PGx and GND, don't connect R233~R236 resistor to VDDA and capacitor at the same time.

    thank you very much~

    BR,

    zhao

     

  • Hi Zhao

    Thank you very much for your feedback in detail.

    R233~R236 are connected to VDDD, but they will not insert these registers in real.

    Thanks.
  • Hi, Alber

    You are welcome.