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RE: CMOS Bidirectional H-bridge DC motor drivers

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Thank you . I zeroed on DRV8871. Need little more help please. Am using a geared DC motor to operate water valve. My DC motor is rated 12V - 20mA max No Load and 800mA max Full Load & Stall (30 rpm with 20Kgcm torque). Normal operation means 1 second rotation and 500ms stall to ensure closure. Could you please suggest what value and type Bulk Capacitor on VM (pin 5) best suits my application. Can I go ahead with 47uF capacitor?

Power supply ratings are 12V 5A with lines running upto 50m on 16AWG copper cables. Also should I necessarily use a Tantalum or Aluminium Organic Polymer Capacitor for VM pin? Considering 10-12V constant DC voltage on VM pin for my case, can I not use a cheap Aluminium Electrolytic capacitor. Are ESR and Ripple Current.

The main reason I would not want to use Tantalum/Organic Polymer capacitors are their costs.


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