• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 30 subscribers
  • Views 187 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DRV8305: Use with IPTG014N10NM5

Christian Bacchetta
Prodigy 50 points
Part Number: DRV8305

Goodmornig.

I would like to know what capacitor I shall use as charge pump (bootstrap) if I need to drive a bridge of six IPTG014N10NM5. On your datasheet use a 47nF. Is it sufficient ? Can I increase it ?

I need to drive 107A with the bridge; this is the reason of the choice of the MOS IPTG014N10NM5.

Waiting for a your kind answer, I thank you.

Best regards.

Christian Bacchetta

  • 0
    TI__Mastermind 26046 points

    Hi Christian,

    No, you cannot increase the value. You should use a 47nF capacitor for CP1H-CP1L and CP2H-CP2L and proper operation of the tripler charge pump. Higher values can affect the operation. 

    Thanks,
    Aaron

  • +1 in reply to Aaron Barrera
    Prodigy 50 points

    Hello Aaron.

    Thank you for your reply. I have a question.

    The MOSes I selected has 12nF of input capacity ech one; does the driver pilot them with the value of 47nF of the charge pump ?

    Thanks.

    Christian Bacchetta

  • 0 in reply to Christian Bacchetta
    TI__Mastermind 26046 points

    Hi Christian, 

    The 47nF cap is the charge pump flying capacitor, this value is used for the charge pump controller integrated into the DRV8305 to generate VCPH voltage. 

    I believe what you're thinking of is the VCPH-PVDD storage cap value. This cap stores the VCP voltage which is used to pilot the high-side gate drive voltage (GH_x). This will be affected by the FET's input gate charge, which is the following equation:

    Therefore, you may increase the value of VCPH-PVDD capacitor, but not the CP1H-CP1L or CP2H-CP2L capacitor. 

    Thanks,
    Aaron