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DRV110: Driving 12V DC Solenoid directly from a rectified Mains voltage.

Arno Espag
Prodigy 40 points
Part Number: DRV110
Other Parts Discussed in Thread: TIDA-00284

I used the DRV110 to successfully drive a 12V solenoid from a 12V source.  It works very well.

Will I be able to drive the same solenoid from a 230V rectified line, which produces a DC volage of 325V, or would you recommend that the line voltage be dropped to a more suitable level.  Can I simply just adapt my mosfet switch to handle the higher voltage?

Thanks

Arno Espag

  • 0
    TI__Genius 14485 points
    Hello Arno,

    I'm glad to hear you had success with operating the DRV110 at 12V.

    You can definitely power the DRV110 from rectified 230V. Our reference design TIDA-00284 does just that. As you suggest, you will need to choose a different MOSFET for the new voltage and current requirements. Our NexFET portfolio has some good options for FETs for this type of application.

    Let me know if you have any other questions.
  • 0 in reply to James Lockridge19
    Prodigy 40 points

    Hello James

    Thanks for your reply.  

    I understand that the DRV110 is a current controller, but the reference design you suggested uses a 230V solenoiod.  My question was, can I drive a 12V solenoid by simply controlling the current.  Will I not damage the solenoid by subjecting it to pulses in excess of 300V, or does the DRV110 regulate the voltage across the solenoid to something closer to 12V?

    Thanks again for your help.

    Arno

  • 0 in reply to Arno Espag
    TI__Genius 14485 points
    Hello Arno,

    The DRV110 regulates the current through the solenoid using PWM. If you set the DRV110 to regulate for the same current you chose for your 12-V circuit, then the solenoid should operate fine. Ultimately, the solenoid would fail due to too much current going through it rather than the voltage put on it.

    The capability of the DRV110 to regulate the current in the solenoid will be based on how fast the solenoid charges. I need to do some more investigation to give a better design parameter for this, but here is a "back-of-the-envelope" approximation that I think will work.

    0.075 << I*R/V

    Where:
    I = the peak current or the hold current (calculation is best done with the hold current)
    R = series resistance of solenoid
    V = solenoid supply voltage
  • 0 in reply to James Lockridge19
    Prodigy 40 points

    Thanks James

    I will test and let you know what happened.

    Regards

    Arno

  • 0 in reply to Arno Espag
    Prodigy 40 points

    Hello James

    I now have another problem with the DRV110 driving a 12V solenoid.  My design is real simple, but the problem is that I find that some work and some not for some reason.  I tied the Power pin and the enable pin together and when I turn the power on some refuse to work.  The external conditions are all the same. PCBs are all the same.  Where can I send you the circuit diagram?

    Thanks

  • 0 in reply to Arno Espag
    TI__Genius 14485 points

    Arno,

    You can send your schematic to me a in a private message on the E2E forum.

    You should not tie the power pin to the EN pin. The EN pin is only rated for 7 V maximum. Internally, the EN pin has a resistor network that asserts it to high by default when powered on. Rather than tying it to the power pin, you can just leave it floating for the same functionality.