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CMOS Bidirectional H-bridge DC motor drivers

RAVI TEJA
Intellectual 270 points
Other Parts Discussed in Thread: SN754410, DRV8871

Hi,

Can someone please suggest me CMOS Bidirectional H-bridge DC motor drivers with 12V 500mA drive capability. I have considered SN754410 & L298 drivers but both of them need 5V for VCC1 pins - but I only have 3.3V & 12V on board supplies and not very keen on having another voltage converter on board. Also just wondering if 3.3V is sufficient to power SN754410 & L298 - both the datasheets ask for a minimum 4.5V on VCC1 pins.

Thanks,

Ravi

  • 0
    TI__Guru** 114905 points

    Hi Ravi,

    There are several devices to choose between HERE

  • 0 in reply to Rick Duncan
    Intellectual 270 points

    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.

  • 0 in reply to RAVI TEJA
    TI__Mastermind 26065 points
    Hi Ravi,

    Would recommend a 0.1uF ceramic + 47uF(100uF better) Tan/Al for the VM decoupling in your case. Please put the 0.1uF close enough to the VM pin and the 47uF also as close as possible to VM and a GND plane.

    Best regards,