• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 62 subscribers
  • Views 393 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.

TLV62569: TLV62569

Leslie Valmadre
Prodigy 70 points
Part Number: TLV62569
Other Parts Discussed in Thread: SN74AUP2G80,

Hello,

I am using theTLV62569 IC in a buck converter circuit and it uses an Logic EN pin to enable/disable the IC output.  Pin high=enabled and Pin Low=disabled.  I will have a switch that when closed will connect EN to ground sending it low.  Is there any way to use a momentary tactile switch to manage that control.  I have seen circuits using a SN74AUP2G80 that would I am sure work but for a simple logic connection that is Hi/Low that seems to be way overkill so I am hoping someone may have a suggestion for some simple solution.  Certainly I am not clever enough to work one out:-(

BTW I am hoping to use a Tactile switch as they are very small and all the small ON/OFF switches I have found are too big for my project so I am hoping to use something similar to this https://docs.rs-online.com/4f6e/0900766b810d5f0c.pdf.  The current through the switch when EN is connected to Ground will be approx 0.001mA and 3.7v.

Hope someone can advise some ideas so I can explore options.

Regards

  • 0
    TI__Expert 7595 points

    Hi Leslie,

    Thanks for your question.

    Unfortunately I cannot think of a simple way to convert a pulsed waveform (coming from the switch) to the HIGH/LOW voltage level required by the converter without using a digital component (as the flip flop). Of course it would be way easier with an ON/OFF switch, but I understand that the dimension can be critical for your project.

    Thanks,

    Stefano

    All information in this correspondence and in any related correspondence is provided “as is” and “with all faults”, and is subject to TI’s Important Notice (http://www.ti.com/corp/docs/legal/important-notice.shtml).

  • 0 in reply to Stefano Panaro
    Prodigy 70 points

    Hi Stefano,  Thank you for your reply I sort of guessed that would be the case but thought asking wouldn't hurt:-)

    I have, after some more research, seen where a TI IC 4093B has been used in similar tactile to ON/OFF circuits and am wondering if TI have any sample circuits using that IC or even if a circuit can be developed using webench.  The circuits I have seen all use fairly generic inputs and are really just to create an ON/OFF from a Tactile momentary which is what I want to achieve but in my case I am using a design developed via WEBench and using a TLV62569 as a buck converter.  

    Is there anyway to use WEBench to develop such a circuit using the 4093 and can it be incorporated into the WEBench design already generated for the TLV62569?  Or is there a generic design schematic for the conversion from Tactile to ON/OFF available from TI

    Probably naive questions but hope you can advise

    Regards

  • 0 in reply to Leslie Valmadre
    TI__Expert 7595 points

    Hi Leslie,

    Unfortunately Webench does not give you the flexibility to add other devices to the simulation.

    I would advise you to take a look at the simulator PSPICE-FOR-TI. Here you can add other devices to the simulations. If you are interested, you can start from TLV62569 PSpice Unencrypted Transient Model (Rev. A) , available in the device page (TLV62569 data sheet, product information and support | TI.com).

    I don't know by heart any reference designs that could be suitable for your application, but I will take a look and get back to you.

    Thanks,

    Stefano

    All information in this correspondence and in any related correspondence is provided “as is” and “with all faults”, and is subject to TI’s Important Notice (http://www.ti.com/corp/docs/legal/important-notice.shtml).