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TIDA-010208: Diode at PACK+,- pins

Shyama Agrawal
Intellectual 860 points
Part Number: TIDA-010208

Hello,

In TIDA-010208 (Page-6), the writer has used D47. What will happen if a charger is connected in reverse polarity? Attached is the image of the section I am referring to. Please clarify the purpose of D47.

  • 0
    TI__Expert 5920 points

    Hi, 

    Thanks for your question.

    Our engineer will reply you soon.

  • +1
    TI__Expert 3145 points

    Hi, 

    When charger is attached reversely, D47 will forward conduct and clamp the minimum voltage. Normally chargers has CC-CV control and won't allow the current to increase too high to damage D47. 

    D47 here is to support a path to prevent PACK+ voltage much lower than PACK-, this scenario happens with two situations: 1) charger is attached reversely; 2) PACK+ is short to PACK- and there is a larger parasitic inductance on PCB and external short wire, the inductance will generate a huge reverse voltage when DSG MOSFETs are turning off (with huge di/dt). And this reverse voltage will bee added to the total battery voltage and damage DSG MOSFET if your MOSFETs' max VDS voltage is not high enough. 

    Thanks.

    Best Regards,

    Ryan Tan