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Looking for a high current half-bridge driver

Matthew Krenik
Intellectual 675 points
Other Parts Discussed in Thread: DRV8829, DRV8840, DRV8850

Hello,

I'm looking for a high current half bridge driver that takes a simple PWM input and digital input (high side or low side). I plan on driving at less than 25 kHz. I do need high current: probably around 6A, although higher might nice.

I've found a good chip from infineon that works well. I'd rather order with TI, but I can't find anything so simple from Texas instuments that provides the necessary specs. Any thoughts?  

http://www.infineon.com/cms/en/product/automotive-ics/motor-drivers-automotive/integrated-high-current-motor-drivers-novalithic-tm/trilith-ic/BTN7960B/productType.html?productType=db3a304413719f72011372e9554e00da

Thanks,

Matt

  • 0
    TI__Mastermind 20985 points

    Hi Matt, what kind of motor are you driving?  I'm not aware of any TI devices with a single half-H bridge.  We have multiple 1-H (such as DRV8829), supporting 24V 5A.

    Best regards,
    RE

  • 0 in reply to RE
    Intellectual 675 points

    I've been using 2 Half bridge driver circuits and toggling the high/low settings on each with a GPIO from an MCU. My motor is a voice coil, similar to one you would find in a hard disk drive. 

    I feel like there are a lot of functions on this chip that I would not be using, but I'm pretty sure it will work with my application. My supply voltage just needs to be the resistance of my motor times 5A, and I can achieve the peak? And if I want to run a smaller amperage through the motor, I just need to utilize the 32-level current regulator? And I can pretty much ignore everything having to do with a stepper motor? 

    Thanks for your help, I've just gotten into looking at motors, so I'm pretty unfamiliar with anything but very simple circuits. 

  • 0 in reply to Matthew Krenik
    TI__Mastermind 21320 points

    Hi Matthew,

    You may want to check out some of these products. I am not sure they have quite the power you are looking for though.

    http://www.ti.com/lsds/ti/amplifiers-linear/pwm-power-driver-products.page

  • 0 in reply to Matthew Krenik
    TI__Mastermind 20985 points

    So once the motor spins, a back-EMF is generated, and the voltage across the motor coil is VM minus BEMF.  And when current is changing (like on startup), the motor's inductance has a voltage drop.

    Yes, you can utilize the 32-level current regulator.  The DRV8840 is the same device as DRV8829, except ENABLE=Low causes Low on each output (brake) instead of High-Z (coast).

    We also have the new DRV8850, a 1-H device supporting a low supply voltage of 2V-5.5V and 8A peak.

    Best regards,
    RE