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BQ76952: Explane more the schematic of reference design for two stack BQ76952

Long Nguyen
Prodigy 10 points
Part Number: BQ76952 
About the TIDA-010247 Schematic. Can someone clearly explain what is the purpose of the TOP LD pin in this case? is it possible not to use this TOP LD pin?
  • 0
    TI__Expert 3345 points

    Hi, 

    As listed in the sch, TOP_LD is used for 2 purposes: 1) for end of pre-discharge judgement; 2) as a reference of TOP_DSG. Especially for the 2ed purpose, when top AFE wants to turn off DSG MOSFET, TOP_DSG drops towards to TOP_LD and turn off Q41, so DSG MOSFET can be turned off completely. You can refer more detail explanations from below paper: Design Considerations of Stacked BQ769x2 With High-Side N-MOSFET

    If you don't want to use TOP_LD, you need to consider how to turn off DSG MOSFET completely. 

    Ryan Tan