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BQ24780S: BQ24735 BQ24780 HPB resverse boost regulation

user4819317
Prodigy 160 points
Part Number: BQ24780S
Other Parts Discussed in Thread: BQ24780, BQ24735,

Hi guys,

1. Could you tell me details  what difference between BQ24735 and BQ24780. What i understand is they are both HPB architecture?

2. Any other samples with HPB architecture can recommend to me? 

3. About HPB, when boost operation happens,  the boost target regulation voltage is decided by what? what i understand is: when boost happens, the system voltage is dropping and then trigger reverse boost. what I

confused is the boost regulation voltage operation, is it decided by internal resister divider? 

Could you explain it and really appreciate!

  • 0
    TI__Genius 14355 points

    Hi,

    1. The table is their comparison table. From this table you will know difference.

    2. For HB topology charger solution, I will suggest BQ24780S for design.

    3. During turbo-boost condition, our charger didn't regulate system voltage, we monitor input current to control PWM driver signal, so the system voltage will be closed to adaptor voltage.

    Thanks 

  • 0 in reply to Paul Yeh
    Prodigy 160 points
    Hi Paul,
    Thanks for your quick reply. You can call me Eddy.

    3. During turbo-boost condition, our charger didn't regulate system voltage, we monitor input current to control PWM driver signal, so the system voltage will be closed to adaptor voltage.
    --> After monitoring the input current reaching the IINDPM setting, if the system load continue increasing, control the pwm signal to reduce the charging current for priority the system load, I think this can be understood easily.
    A case as following :after the charging current reduce to zero because of system load increasing, if the load continue increasing until the
    adapter capability (because ACIN and VSYS is connected by ACFET switch), when this happens ,the system voltage dropping happen, BQ24780S will operate reverse boost?? How to operate boost regulation ?
    Could you give me more details explanation? Thanks.
  • 0 in reply to user4819317
    TI__Genius 14355 points

    Eddy,

    Good day. I attached one page to explain IC how to enter boost mode. Hope it is clear for you.

    Thanks