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BQ24780S: current limit

Part Number: BQ24780S

Dear All:

    when I use the BQ24780S,  If system power demand is temporarily exceeds adapter rating, the  bq24780s supports hybrid power boost mode  to allow battery discharge
energy to supplement system power, officially the input current is limited, but I find sometimes  the adapter current  exceed the input current  limit value in  turbo boost mode 

you  will see the phenomenon in my product application, that the turbo boost mode and Underclocking happened at the same time.

can you explain the issue? thanks!

  • Bill,

    Please list the detail operating condition and the setting. For example: if the input current limit setting is lower than 1.5A, BQ24780S cannot support hybrid mode.

    1. What is the input current limit setting?

    2. What are the input voltage, battery voltage and system load current?

    3. What is the turbo mode deglitch timing setting?

    4. What is input source over load capability?

    Would you measure the input voltage, /TB_STAT, input current and switching node waveform?