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Low Side Driver

Kash Olia
Genius 3215 points
Other Parts Discussed in Thread: ULN2003A, TPL7407LA, TPL7407LA-Q1

Hi,

I'm designing a board and looking for a Low Side Driver/Output so I can sink the signal. I'd like to sink a load powered by a 12V supply. 

Thanks,

Kash Olia

  • 0
    TI__Mastermind 32650 points

    Hi Kash,

    TI's Low side switch portfolio can be found at: http://www.ti.com/power-management/power-switches/low-side-switches/products.html

    While the voltage is compliant for many of the device on there, do note that the amount of current flowing through these devices is usually the limiting factor as well as the nature of the load (inductive, resistive). Please take care when selecting the right switch for your application. 

    Off the top of my head I would say two options to consider are the ULN2003A which is a 7-ch Darlington array and TPL7407LA which is a 7-ch NMOS array.

    Thank you for choosing TI Power Switches in your designs.

  • 0 in reply to Shreyas Dmello
    Genius 3215 points

    Shreyas,

    Thanks for your reply and sorry late reply. 

    TPL7407LA-Q1 seems to be a good fit, although I may need to combine the outputs for loads with more current.

    What I understand from the circuit diagram I should be able to command the input pins (enable) with PWM signal and control the drain of the MOSFET, so basically I'd be able to control the speed of the DC motor connected to the output side by changing the duty cycle of the PWM input signal. Does my interpretation seem correct to you?

    Thanks,

  • 0 in reply to Kash Olia
    TI__Mastermind 32650 points

    Hi Kash,

    Your interpretation seems correct for how the device works. I do think your limiting feature is the tPLH and tPHL of the TPL7407LA-Q1.

    Also, I'm not familiar with the current loads of your DC motor so please take care when running this device to not exceed the Absolute Max Ratings.

  • 0 in reply to Shreyas Dmello
    Genius 3215 points

    Thanks Shreyas!