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HELP WITH TPS2590 HIGH CURRENT LOAD SWITCH

David Albert
Prodigy 20 points
Other Parts Discussed in Thread: TPS2590

with the section of Datasheet for the TPS2590 Datasheet (

SLUS960B –JULY 2009–REVISED AUGUST 2010 - on PAGE 3

 

Section - OUT - POWER LIMIT Specification - What is this the POWER limit of???  Is it the POWER LIMIT of (Vout*Iout) or is it the limit of (Iout * RON)  - I AM A LITTLE CONFUSED HERE.

 

I am also confused if this is the CORRECT FORUM to ASK this particular PART QUESTION.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ELECTRICAL CHARACTERISTICS

over operating free-air temperature range (unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

OUT

RON R

 

 

VIN-VOUT, IVOUT < IRLIM or IVOUT < (ISET x 1.25), 1 29.5 42.0 mΩ A ≤ IVOUT ≤

4.5 A

Power limit V

 

 

IN: 12 V, COUT = 1000 mF, EN: 3 V →

0 V 3 5 7.5 W

Reverse diode voltage V

 

 

OUT > VIN , EN = 5 V, IIN

= - 1 A 0.77 1.0 V

 

I NEED SOME HELP ASAP!!! or POINT ME TO THE CORRECT GROUP TO POST THIS QUESTION ABOUT THE LOAD SWITCH POWER.

 

 

 

 

  • 0
    TI__Genius 9415 points

    There is an internal MOSFET switching the input to the output. The power dissipated in this FET is limited to 5W. In this way the FET is always run in it's safe operating area. The power is (vin -Vout) x Iout.

  • 0 in reply to Bob Kando
    Prodigy 20 points

    So, the Current set thru the device (Iout) is truly set by the Rlim and Rflt resistors then, correct???  They are independent of voltage set??

     

    In our application we are using two Load switches - One at 5.0 Volts and one at 3.7Volts.  We want max Ilim, so we are setting Rlim = 40.2Kohm

    and Rflt = 49.9Kohm.  That should give us a ILim = 5A and IFlt = 4A, correct???

     

     

  • 0 in reply to David Albert
    TI__Genius 9415 points

    That's right, the RILIM and RIFLT program the output current output limits.  The current limits are independent of the input voltage.

    Your RILIM and RFLT values allow the maximum output current, ILIM = 5A and IFLT = 4A.