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ULN2004 VOL,VOH, VIL,VIH

1567623
Intellectual 330 points
Other Parts Discussed in Thread: ULN2003A

Hi 

Can i get information about  ULN2004    VOL,VOH, VIL,VIH 

  • 0
    TI__Mastermind 24485 points

    Hello,

    All of this information is in he datasheet, just in various forms here and there, so let me help to explain.

    1. VOL - the output low voltage is the VCE(sat) specification. The actual voltage will depend on loading conditions as well as the input voltage. 

    2. VOH - The VOH voltage is dependent upon whats powering the external devices. This device does not source current to the output, but is simply used as a switch to ground to activate the peripherals. The outputs can tolerate a voltage up to 50V.

    3. VIL - This can be seen as the II(off) specification where the current into the device needs to be below a certain threshold to ensure that the device is off. It usually is also ok to just say that the output is off when the input voltage is much below the VIH specification. 

    4. VIH - This is specified as the VI(on) specification in the datasheet. This is also dependent upon the output loading conditions.

    Please let me know if you have any additional questions.

    Best,
    Michael

  • 0
    Intellectual 470 points
    Hi, I am new to this forum. Unfortunately I do not have an answer for your question. I just have a problem of my own, but I was unable to find "a new post" tab, so... My problem is I have connected ULN2003 to stepper motor at output side and to PIC16F Mc at the input side. I am unable to mod=ve the motor even a bit. I am powering the motor with 12 VDC and powering the Mc through my laptop. My power supply shows 0.0 current ! and as i said the stepper does not move. I think for some reason the NPNs inside uln2003 do not turn on ! that is why I do not see any current flowing ! Any idea ? Thanks.
  • 0 in reply to nader niakan90
    TI__Mastermind 24485 points

    Hello Nader,

    There is a button at the top right of the forum that you can click to add a new post (where it says "+ Sign in to Post":

    As for your question, it may just depend on your motor driving scheme. 

    There is an application note that describes different stepper motor driving patterns. 

    http://www.ti.com/lit/an/slva767/slva767.pdf 

    I am also not sure if you are using a stepper motor or a DC motor. It's possible, but I think unlikely that the ULN2003A is not working properly.

    There is also a BoosterPack that we offer to help in your design with driving stepper motors:

    http://www.ti.com/tool/boostxl-uln2003 

    This can be easily paired with any of the MSP430s in our Launchpad Ecosystem to help drive stepper motors.

    http://www.ti.com/lsds/ti/tools-software/launchpads/overview/overview.page

    Feel free to let me know if you have additional questions. If you have a new question try to go ahead and post in a new thread.

    Best,
    Michael