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BQ24200: What if current during charge drops below Itaper?

Oliver Schett
Prodigy 50 points
Part Number: BQ24200
Other Parts Discussed in Thread: BQ24210, BQ24650

Hey,

So I want to design a Solar charging circuit for a battery pack with 10000mAh, for MPPT i use a SPV1040 from St Microelectronics and I need a chip that controls the charging of the battery pack. So i stumbled across the BQ24200. The only concern I have is, what happens when the charging current drops below the 25mA of Itaper during the charge? Since the solar panel is heavily current limited it could happen that the charge current drops below this value. Is going to be a fault issued? If yes then how to disable this fault?

My problem with this whole circuit is that I'm using such a big battery pack that no ordinary charge controller is suitable, because they have timer's that are always going to be issuing a fault, because the battery pack is not full. Is there a solution to this problem?

  • 0
    TI__Guru*** 143880 points
    Oliver,

    You might look at bq24210. It is designed for solar charging and allows you to disable the timer.
  • 0
    TI__Guru 65746 points
    Hello
    The BQ24200 is an older device that has high input voltage capability but no option to disable the timers. Device is not designed with solar cell in mind.

    Take a look a the BQ24650 it is a switching charger with MPPT and will support a wide input voltage.
    Another device is the BQ24210 it is a linear and designed for Solar Cell applications.