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BQ24072T: Meet IEC62368 at BQ24072T

takahiko yokota
Mastermind 7135 points
Part Number: BQ24072T
Other Parts Discussed in Thread: BQ24072,

Hi

My customer are required additional the charging safegard to battery with changing  IEC62368.
So they must stop charging at Ta=45℃. 
They use BQ24072 but they could not stop charging because the exothermic of battery is small at Ta=45℃.
Are there the method to resolve it?
Or are there the devices to be able to meet IEC62368?

Best regards,
Yokota
  • 0
    TI__Guru 67476 points
    Hello
    The bq24072 will use a current current source to measure the NTC value for temp sensing.
    The bq24072T will use a voltage to measure the to measure the NTC value for temp sensing.

    BQ24072 is less flexible and more difficult to set up for a 0C to 45C application.
    BQ24072T can be configured for this range with a common NTC value, see below where a tighter range was used for margin.

    I have a run calculation on the bq24072T, valid for bq2407XT.
    NTC – beta 3380k and 10k at 25C
    Temp Hot – 5C (5.81k)
    Temp Cold – 40C (22.6k)

    R7 = 19.36k
    R6 = 31.28k