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New Product: DRV8801 Single Brushed DC Motor Driver Carrier


#1

Hello!

We have just released a new low-power brushed DC motor driver that can deliver a continuous 1 A and offers a wide operating voltage range of 8 - 36 V range. The module is a breakout board for TI’s DRV8801 motor driver that features a simple two-pin speed/direction interface, current-sense feedback, and built-in protection against under-voltage, over-current, and over-temperature, providing a great alternative to motor drivers such as the L293D, SN754410, and L298N.

For more information, please see the DRV8801 motor driver carrier product page.

- Ben


#2

Looks nice, well done again.

I’m always sniffing for bigger drivers though. Do Pololu have any plans to build drivers based on the http://www.ti.com/product/drv8832 or http://www.ti.com/product/drv8812 ?


#3

Hello.

I think our DRV8833, DRV8835, DRV8824 carriers are going to be better than those two drivers you linked to. Am I missing something?

- Ben


#4

No, I’m missing something, namely an 8 that should be a 4. D’oh.

I meant DRV8412 & ti.com/lit/ds/symlink/drv8432.pdf.


#5

Hi.

Those parts looks a little difficult because of the extra 12V requirement; it also looks like they might not be able to do 100% duty cycle. They might make for an interesting low-voltage (3-12 V?) option, with an external boost regulator to get the 12V, but that is a waste of the 50V MOSFETs in the chip. For voltages above 6V, I think other parts like the MC33926 and VNH5019 are more compelling. Is there a performance point of these new TI parts that is particularly interesting for you?

- Jan


#6

Hi Jan

I didn’t see the extra 12V requirement until you pointed it out. I can see that makes things harder.

What attracted me to those chips was the possibility of a high current stepper drive, 3A or 7A is a lot bigger than your offerings.
Since these chips offer “parallel mode”, I also wonder if a more versatile “brushed or stepper” driver could be made, where you select the motor type via jumpers.

Their graph on page 9 of the datasheet suggests to me it reaches 100% duty cycle, what makes you think they may not reach 100% ?

I’m thinking of 24/36 and maybe even 48V systems, we’re already spoiled for choices below 12V.


#7

I’m basing the duty cycle limitation assumption on the “Bootstrap Capacitor Under Voltage Protection” section on page 11. Also, I do not see a separate charge pump for keeping the high-side N-channel MOSFET gate supply topped off to keep the MOSFETs on indefinitely.

- Jan


#8

I must say, I’m glad you understand that section, because I certainly don’t !

Any comment on my idea of a ‘universal’ drive board that could drive a high current stepper or 1 or 2 brushed motors ?


#9

I doubt that a dual-function, stepper/brushed motor driver would be that interesting. I suppose that if you have a driver for one of the purposes, it wouldn’t hurt to have the option of using it for the other kind of motor, but I suspect that the tradeoffs would make it not that great for at least one of the applications. For instance, looks like these chips do not have the step/direction interface that many stepper drivers do; if we added that externally somehow, people who want just the dual brushed motor drivers would be paying for extra stuff they don’t need.

- Jan


#10

Sounds reasonable. Thanks for all your replies.