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DRV8701: Control Linak LA14

Eric van Uden
Prodigy 20 points
Part Number: DRV8701
Other Parts Discussed in Thread: DRV8251A

Hello,

We want to control a Linak LA14 motor using the DRV8701:

We want to control the motor in one direction: open or close. Could you comment on this if you see any challenges?

-This takes a couple of seconds. We do not want to PWM the drive signal.
-Control is done by a microcontroller
-Current is sensed by ADC of microcontroller.
-FET will be 2N7002K-T1-GE3 (3A) --> maximum current of Linak motor is 2A. 

Could you comment on this if you see any challengs? Thanks in advance!

  • +1
    TI__Genius 17998 points

    Hey Eric, 

    Is there a reason you want to use a gate driver such as the DRV8701 for this?  We have many integrated Brushed DC motor drivers with integrated current sensing that can drive >2A continuously, these would have a MUCH smaller package size and solution cost than the gate driver solution.

    For example check out the DRV8251A - https://www.ti.com/product/DRV8251A 

    If you let me know your operating voltage I can provide a better suggestion if you're open to integrated driver solutions.  

    Eric van Uden said:
    -This takes a couple of seconds. We do not want to PWM the drive signal.

    Without PWM control the motor voltage will determine the speed of the motor.  If you give 100% duty cycle at VM with your operating voltage does it accomplish your time requirement?  

    Best,

    Jacob

  • 0 in reply to Jacob Thompson
    Prodigy 20 points

    Hello Jacob,

    Thank you for your quick reply. Your suggestion is much better proposal regarding pricing and size. I switched to this component. 

    I think this answers the question already. The circuit is powered by +24V, so the DRV8251A  seems to be a good option. 

    Further regarding your question. We only want to provide the VM supply voltage to the motor. No PWM is required. Only the direction should be controlled. 


    With kind regards,


    Eric van Uden