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TPS25730: TPS25730

Jacob Bitton
Prodigy 60 points
Part Number: TPS25730

Tool/software:

I want to set the ADCIN1 to ADCIN4 voltage to configure the output voltage to 20V 5A.

the voltage for ADCIN1 and ADCIN2 are given by datasheet Table 8-1, what should be the voltage for ADCIN 3 and ADCIN4? why there is no a table like TABLE8-1 for ADCIN3 and ADCIN4?

Regards

  • 0
    TI__Mastermind 34046 points

    Hi Jacob, 

    Apologies are the confusion, table 8-1 can also be applied for ACIN3 and ADCIN4 as well. There are no differences between the DIV calculation for all of the ADCINx pins. 

    You can refer to the TPS25730EVM as a reference, all the resistor divider components are the same across all 4 ADCINx pins. 

    Thanks and Regards,
    Raymond Lin

  • +1 in reply to Raymond Lin
    Prodigy 60 points

    Hello Lin,

    Thanks for the clarification.

    Section 9.2.2 shows an example to generate 20V/3A, according to the decoding tables the ADCINx values should be:

    ADCIN1=0, ADCIN2=7, ADCIN3=3 and ADCIN4=1

    But when calculating the 4 voltages (see below) I received the following:

     ADCIN1=1, ADCIN2=7, ADCIN3=5 and ADCIN4=3

    These voltages shall give:

    Vmin=9V, Vmax=20V, Operating Current= 5A and Max Current=5A.

    Please help.

    Best Regards

     

  • 0 in reply to Jacob Bitton
    TI__Mastermind 34046 points

    Hi Jacob,

    The decoded value for each ADCINx is calculated below:
    ADCIN1:  2.28/(2.28+198.2) = 0.01137 -> decodes to 0

    ADCIN2: 191/(191+9.4) = 0.953 -> decodes to 7

    ADCIN3: 38/(38+162) = 0.19 -> decodes to 3

    ADCIN4: 9.5/(9.5+190) = 0.0476 -> decodes to 1

    ADCIN1 and ADCIN2 configures the min and max voltage of 5V to 20V with device I2C address of 0x20.

    ADCIN3 and ADCIN4 configures the min and max current of 3A. 

    You can refer to the DIV equation on Table 8-1 to calculate the decoded values for each resistor divider pin strapping. 
    Let us know if you have any further questions! 

    Thanks and Regards,

    Raymon dLIn