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TPS54325

philippe chabot
Prodigy 80 points
Other Parts Discussed in Thread: TPS54325

Hi,

 

what is the electrical characteristic of the EN input for the TPS54325.

impedance,  current leak,  what happens if floating, etc..

 

thank you

 

Philippe

  • 0
    TI__Guru**** 191445 points

    I can tell you that the EN pin is active high.  It must be pulled up to enable the device.  I usually tie EN directly to Vin to enable.  I may have some additional characteristic data fro the EN pin, but I do not hav access to it at this time.  I am out of the office until Monday, so I may not reply further until then

  • 0 in reply to JohnTucker
    TI__Guru**** 191445 points

    I found the additional info.  It relates to current of the EN pin.

     

    For Vin = 12 V, the EN current will vary linearly with EN applied voltage.  0 uA at 0 V, 45 uA at the maximum voltage of 18

    That is all the info that I have other than what is in the datasheet.  Will that suffice?

  • 0 in reply to JohnTucker
    Prodigy 80 points

    Thank you John for your answer.

    1. Is the device disabled when floating ?

    2. can I use a mosfet P-channel,  S=12V,  D=EN,  and I use the gate G to turn ON and OFF the TPS54325 ? any resistance needed at the EN pin ?

     

    Thank you

    philippe

  • 0 in reply to philippe chabot
    TI__Guru**** 191445 points

    The device is OFF when EN is floating.  If you are using that FET to pull EN up to 12 V, then that will work. At 12 V, the IC will draw 20 uA into the EN pin. you may want to use a resistor from drain to ground so that ther is enough current in teh FET.