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DRV8452: How to calculate bulk cap?

Kazuki Itoh
Genius 10820 points
Part Number: DRV8452

Hi team,

Could you let me know how to calculate the recommended bulk cap value?

The datasheet 10.1 describes about the bulk cap, but it doesn't explain how to calculate that specifically.

The FS current of the target motor is 122mA. As four motors are connected to the same VM, my customer assumes larger bulk cap should be needed.

I'm asking my customer to show us the schematic.

 

Best regards,

Kazuki Itoh

  • +1
    TI__Mastermind 23431 points

    Hey Itoh-san,

    See the application report Input and Output Capacitor Selection for a lot of good detail on bulk capacitor calculations in general. We are working on a motor driver specific application note about bulk capacitance calculation, but it is not done yet and I'm not sure when it will be complete. 

    You are welcome to order our EVM and replace the bulk capacitance until you see appropriate current and voltage response in your system.  

    Regards,

    Jacob