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BQ25606: BQ25606 Pin 11 TS must to connect to REGN?

Jian Jjang Zeng
Prodigy 70 points
Part Number: BQ25606

The data sheet shows the voltage regulation on REGN to be 5.6 to 6.65V.

If the typical voltage is 6V, the tolerance will be -6.6%~+10.8%.

And this tolerance, lead the protection can not meet safety criteria.

Can we change the TS bias voltage from a external 3.3V source?

  • 0
    TI__Guru**** 166626 points

    Hi Jian,

    The TS circuit functions by comparing the divided down REGN voltage to internal reference voltages, also from REGN, fed to comparators.  Any relative shift in REGN is seen at TS pin and internal comparators.  If you use external source for TS, the TS function is not accurate.  

    The TS pin ABS max is 7V.  With a voltage divider, the TS never sees the full REGN voltage. 

    To what protection are you referring?

    Regards,

    Jeff 

  • 0 in reply to Jeff F
    Prodigy 70 points

    Because of the large tolerance of REGN.

    We are afraid the thermal protection may have chance to cause charger still work even battery temp over 65C, which already over battery charging temp 60C.

  • 0 in reply to Jian Jjang Zeng
    Prodigy 70 points

    Hi Jeff

    One more question, as you indicated the comparators are feed from REGN also.

    The tolerane would not like below:

           The data sheet shows the voltage regulation on REGN to be 5.6 to 6.65V.

           If the typical voltage is 6V, the tolerance will be -6.6%~+10.8%.

    What's the tolerance of the REGN will be when we calculate device overall tolerance on VTS?

  • 0 in reply to Jian Jjang Zeng
    TI__Guru 57651 points

    Hi,

    Will get back to you during business hours in the next week.

    Thanks,

    Ning.

  • 0 in reply to Ning T
    TI__Guru**** 166626 points

    Hi Jian,

    Because the resistor divider is pulled up to the same voltage as the comparator reference values, all voltages will shift by same tolerance so the tolerance is irrelevant.  It will not affect the TS function accuracy.

    Regards,

    Jeff