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TPS25910: Question regarding equation 11

Al Paulhus
Prodigy 170 points
Part Number: TPS25910

What is IC-LOAD in equation 11?  Is that "-" a just a hyphen or is it subtraction ?  Is there an error in the document as IC is never really defined ?

  • 0
    TI__Guru 57737 points

    Hi Al Paulhus,

    In equation 11,  IC-LOAD is the current flowing into the output capacitor.

    If there is any load current, then the current flowing into the Output Capacitor is = Input Current - Load Current.

  • 0 in reply to Praveen GD
    TI__Guru 57737 points
    Hi Al Paulhus,

    Do you have any more questions ? If not, can we close this thread ?
  • 0 in reply to Praveen GD
    Prodigy 170 points

    I do have another question regarding the GATE pin.  The datasheet says that the maximum voltage on GATE is 7.5V.   But this cannot be correct !  If this part uses an NMOS FET as its switch, its gate voltage would need to be greater than 20V to turn ON this FET if I undersatnd how FETS work.  Is my interpretation of this specification in error? 

  • 0 in reply to Al Paulhus
    TI__Guru 57737 points

    Hi Al Paulhus,

    Your understanding is correct. For N-Channel FET's , the Gate voltage has to be greater than the Source Voltage.

    As you can see in the Datasheet 'ELECTRICAL CHARACTERISTICS' section, the Gate Output Voltage is specified as 'GATE-OUT' voltage which is the gate to Source Voltage.

    If the Vin raises, the Gate Voltage also raises maintaining V(GATE-OUT) around 6.6V. 

    Hope this answers your question.