• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 49 subscribers
  • Views 777 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LM293: Output on Single - Supply

user6024592
Prodigy 30 points
Part Number: LM293

Hi , there

I'm trying to use LM293 for my application and I can't get my expected output when it works on single-supply .

I use the TINA to simulate my circuit (Model of LM293 is from http://www.ti.com/product/LM293/toolssoftware )

Above is my circuit and the results

In my view , a low output will get when IN+ is lower than IN-.

Q1：Whether I misunderstand the LM293？

Q2：What‘s wrong with my circuit and how can I do to resolve it？

Thanks

  • 0
    TI__Genius 10485 points

    Hi,

    For your answer to Q1, the common-mode input voltage range is 0 to Vcc – 1.5 V.  With the 12V Vcc you are using, the common-mode input voltage range is 0 to 10.5V. Your input has a voltage swing from 10V to -10V. Therefore, you are violating the common mode of the device.

    Before I answer your second question, I have some follow-up questions:

    1. What is your expected input voltage range for the device?
    2. What is your desired output voltage range?

    Regards,

    Joe