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BQ40Z50-R1: How to choice "Load Select"

user4576477
Prodigy 90 points
Part Number: BQ40Z50-R1


Hi,

BQ40Z50-R1 Load select function have 7 items for user to choice. Does TI has example or data to explain which one is right choice for application?

Constant Current (Load Mode = 0)               Constant Power (Load Mode = 1)
0 = Avg I Last Run                                        0 = Avg P Last Run
1 = Present average discharge current        1 = Present average discharge power
2 = Current()                                                 2 =Current() × Voltage()
3 = AverageCurrent()                                    3 =AverageCurrent() × average Voltage()
4 = Design Capacity/5                                  4 =Design Energy/5
5 = AtRate() (mA)                                         5 =AtRate() (10 mW)
6 = User Rate-mA                                         6 =User Rate-mW
7 = Max Avg I Last Run (default)                  7 =Max Avg P Last Run(default)

  • 0
    TI__Genius 10830 points
    Hi ,
    Your post has been assigned to one of our BMS experts.

    Regards,
    David
  • 0
    TI__Expert 6575 points
    There is only a second order effect on gauging of the "Load Select" setting, so many of the options may be very similar depending on the load profile.
    The basic guideline to choosing the load select is as follows:
    1. If the load is fixed current or power, Load select 6 is best, but Load select 4 can also be used.
    2. If the load is variable, but does not have much change through the discharge cycle then 1 or 3 is recommended.
    3. For pulsed loads with pulses that are shorter than 10 seconds, Load Select 2 is recommended.
    4. For highly variable loads, where there is no prior information about the variability of the load, Load select 7 is the most conservative option, and Load Select 0 is the optimistic option.
    5. For highly variable loads, where there is prior information about the variability of the load, Load select 5 can be used.

    Regards,
    Swami