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TLV6703: Hysteresis range

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Replies: 22

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Part Number: TLV6703

Hi Sir 

TLV6703 hysteresis range 5.5mV is too small 

May I know how to extend the hysteresis range of TLV6703 ? have any tool can easy design ?

So far our application is 2cell battery voltage monitor ,the battery voltage is 8.4V~6V

We would like to design VIT-=5.9V and VIT+=6V

Thanks 

  • Hi Kai,

    Please see the two cookbooks below about designing external hysteresis for inverting and noninverting configurations:

    Non Inverting: http://www.ti.com/lit/an/sboa313a/sboa313a.pdf

    Inverting: http://www.ti.com/lit/an/snoa997a/snoa997a.pdf

    Regards,

    Jonny

  • Hi Kai,

    can you show a schematic?

    Kai

  • In reply to kai klaas69:

    Hi Kai 

    Thanks for your help 

    I would like to know how to modify this circuit VIT+ = 6.05V ,VIT- = 5.95V

    if have excel calculator ,it will be better 

  • In reply to Kai Hsiao:

    Kai,

    Please try this excel tool for calculating hysteresis. I'm not sure what your output high level was in this case so I wasn't able to test it out first. Please let me know if you have any feedback on the tool!

    Regards,

    JonnyComparator Hysteresis Tool.xlsx

  • In reply to Jonathan Nguyen:

    Hi Jonny

    Thanks for your reply and tool 

    I use the tool to calculator ,it is weird

    1. TLV6703 is internal reference ,my condition is below ,if I set the Vdiv voltage under 5V ,it will have warning information

    2. Resistor range I set 10khom , but R3 result is 20ohm ,which one is correct 

    So far our schematic is using TLV6703 (internal reference) ,could you help to double confirm how to use TLV6703

    Thanks

  • In reply to Kai Hsiao:

    Kai,

    R3 is an input (in yellow), so the default that had showed up was 20 ohms. You can change that to whatever value you plan to use for your pullup. From there, the "resistor range" tab will calculate the remaining resistors as close to the range you select.

    Did you want your VIT+ at 6V or 6.2V? I see in the screenshot you provided, you have Vh set at 6.2 and Vl set at 5.7, which is different from your initial post.

    Because the part has internal reference, you can ignore whatever values it generates for R4 and R5 - I believe R4 is the trouble maker for your case that is causing the warning to show up. Changing Vdiv to less than 6V doesnt change the values it calculated for R1, R2, and R3. Thank you for the feedback and I will look into this... not sure why it is throwing out a warning for this case.

    Below was what I was able to verify to work for the part:

  • In reply to Jonathan Nguyen:

    Kai

    We have not seen any response on this thread in a while, so I am going to close the post.  if you require further assistance, please reply or open a new thread.

    Thanks

    Chuck

  • In reply to Chuck Sins:

    Hi Chuck 

    OK

    We will check your suggestion 

    Thanks

  • In reply to Kai Hsiao:

    Hi Kai,

    unfortunately, the PSPICE model of TLV6703 cannot be imported into TINA-TI. So, I made a simplified TINA-TI simulation:

    This means the following: In your schematic choose R58 = 33k + 910R, R59 = 2k4 and solder a 10M resistor from the "sense" input (pin 3) of TLV6703 to the output (pin 1) of TLV6703.

    To be able to compensate for the manufacturing tolerances of resistors and threshold voltages of TLV6703, you could use a 2k precision multiturn cermet trimmer instead of the 910R resistor.

    Kai

  • In reply to kai klaas69:

    Hi Kai

    Thanks for your fully support 

    Is it possible to provide the excel calculator to us ? due to we may change the VDD and pull up voltage and hys voltage range 

    it will be easy to use TLV6703 

    Thanks

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