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DRV8873H-Q1EVM: recommended capacitor voltage rating

Nicolai E
Prodigy 10 points
Part Number: DRV8873H-Q1EVM
Other Parts Discussed in Thread: DRV8873

Tool/software:

Hello,

while reading the datasheet of the drv8873 I found the general recommendation for the charge pump capacitor "Charge pump output. Connect a 16-V, 1-μF ceramic capacitor from this pin to
the VM supply."

I was wondering if thats the case for any motor voltage (VM). I would expect it to be somehow dependent on vm like the bypass capacitors and others mentioned in the datasheet.

CVM1 VM GND 0.1-μF ceramic capacitor rated for VM
CVM2 VM GND Bulk capacitor rated for VM
CVCP VCP VM 16-V, 1-μF ceramic capacitor
CFLY CPH CPL 47-nF capacitor rated for VM
CDVDD DVDD GND 6.3-V, 1-μF ceramic capacitor

Best regards

Nicolai

  • 0
    TI__Mastermind 45445 points

    Hi Nicolai,

    Thanks for reaching out to us via this forum. 

    Nicolai E said:

    while reading the datasheet of the drv8873 I found the general recommendation for the charge pump capacitor "Charge pump output. Connect a 16-V, 1-μF ceramic capacitor from this pin to
    the VM supply."

    I was wondering if thats the case for any motor voltage (VM). I would expect it to be somehow dependent on vm like the bypass capacitors and others mentioned in the datasheet.

    This is correct. Regardless of VM voltage, we expect the VVCP with respect to VM to be well within this 16 V rating. See below datasheet specification.

    Regards, Murugavel 

  • 0 in reply to Murugavel4637
    Prodigy 10 points

    Hello Murugavel,

    Thanks for your fast reply! In this case I can use the 16V rating cap while VM is 25 Volt. My question is aswered even if it would be interesting to know how this internally works. But I think its confidential.

    Thanks again

    Nicolai