DRV8835 Motor Driver with Pololu regualtor

Other Hardware Motors, Mechanics, Power and CNC
1

I want to use the DRV8835 Dual Motor Driver with the Pololu S7V8F5 Voltage Regulator.

These are my Connections:

ACCU GND -> Pololu GND -> Motor Driver GND
ACCU 7,4 V -> Pololu VIN -> Motor Driver VIN
Pololu VOUT (5V) -> Motor Driver VCC

Just the Pololu worked fine; I got my 5V out of it.
When I connected the Motor Driver in the described way, my Pololu went out of work immediately. Even when I disconnect the Motor Driver, the Pololu is gone.

Do you see any problem in connecting the 5V Vout of the Pololu directly to the Motor Driver? And if yes, why?
Should I Connect the Ardu with the VOUT of the Pololu or the ACCU directly and take the 5V out of the Ardu for my Motor Driver?

Thank you for your help.

2

Hi,
Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png?
Also a picture of your project so we can see your component layout.

Thanks.. Tom... :slight_smile:

3

Ok, here it comes...

IMG_20171108_135255.jpg
IMG_20171108_135255.jpg3264×1836 409 KB

4

Post links to the correct data on all your hardware please - Every module has a product page or
datasheet, that is where we start.

5

Motor Driver:

Pololu regulator:

6

My guess is that you are trying to draw too much current from the voltage regulator.

...R

7

Hi,
Can you post a picture of your two devices.
Did you have to solder the header pins to the PCBs or were they already soldered?

Tom... :slight_smile:

8

Post on the Pololu forum. The engineers support their products and will respond quickly.

Be prepared to explain why you want to regulate the voltage to the motor driver. That is usually not necessary or even desirable.