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DRV8305: Decoupling Capacitor Value Selection

Annie Liu
Genius 10295 points
Part Number: DRV8305

Hi team,

The customer uses DRV8305S to drive a BLDC motor with a rated voltage of 24V and a rated current of 1.7A. May I know how big should the decoupling capacitor be?

Regards,

Annie

  • +1
    TI__Genius 10331 points

    Hi Annie,

    According to the DRV8305 datasheet (External Components table), the decoupling capacitor attached from PVDD to GND (C-PVDD) should have a minimum capacitance of 4.7uF and be rated for the PVDD operating voltage (+24V in this case). This is so that the sensitive internals relying on PVDD are receiving a stabilized charge flow.

    The 1uF capacitors circled are used in the actual layout as, essentially, local smoothing/stabilizing agents of VDRAIN to each FET while the 4.7uF is directly near the PVDD (pin 41) of the IC. 

    Hope this information is satisfactory.

    Best Regards,

    -Joshua

  • 0
    TI__Mastermind 18916 points

    Hi Annie, 

    Do you still require further assistance on this?
    Please help mark the thread as resolved if there are no further questions. Thanks.

    Best Regards, 
    Andrew