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Original question:

DRV8161: Query on spec

DRV8161: Idrive current

Pranjali Andhare
Prodigy 225 points

Part Number: DRV8161
Other Parts Discussed in Thread: LM2665, CSD18543Q3A

Hi Akshay,

 How gate drive peak current relates with this BST diode current (peak) 

  • 0
    TI__Mastermind 26481 points

    Hey Pranjali,

    The current across the bst diode is the iavg current needed to turn on the MOSFEts
    iavg = # of switching mosfets * Qg * FPWM

    The Idrive peak current comes from the bootstrap capacitor which gets charged up from GVDD when LS FET turns on.

    Best,

    Akshay

  • 0 in reply to Akshay Rajeev Menon
    Prodigy 225 points

    Thanks Akshay,

    We are planning to use 5V LDO output as input to  charge pump for getting 8 to 20V GVDD supply.

    Can we use LM2665  charge pump to provide GVDD supply.

    MOSFET - CSD18543Q3A

    Fsw- 1.2 Khz

  • 0 in reply to Pranjali Andhare
    TI__Guru 72105 points

    Hello Pranjali,

    The LM2665 is a simple voltage doubler. The output voltage will therefore be roughly 10V with a 5V LDO. But the voltage drop away from the 10V is dependent on the load current. See Figure 5 in the datasheet. Therefore I think you can use this device for your needs, but am not sure what you mean with 8V to 20V.

    Best regards,
    Brigitte