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BQ78PL116: Schottky diodes in balancing path

Part Number: BQ78PL116

Tool/software:

Hi,

what are the zener diodes (in the EVM schematic D9, D10, D1, ...) above the balancing MOSFETS used for? Is the (parasitic) diode in the MOSFET not enough?

If not, what are the specifications / requirements (reverse voltage,...) of these diodes?

Best regards,

Achim