Dear TI Technical Support Team,
I am designing a board that will be used to control direction and speed of 2xDC hobby motors (3-9V, 110RPM). Two of them can draw at most 250-300mA under full load. I decided to use DRV8837 to control DC motors. I have attached the schematic. In the schematic, C1 and C6 are 100uF 16V electrolytic capacitors. In the pcb layout, I will place them as suggested in datasheet. I have following questions. If possible, could you please answer them.
1. From the datasheet and similiar threads in the forum, what I understand is that, to control/change the direction I need to apply logic 0 or 1 to IN2 input of DRV8837, to control speed using pwm I need to apply pwm signal to IN1 input, and to shutdown the motor driver I need to apply logic 0 to all three inputs (nsleep, IN1 and IN2). Is this correct?
2. I put 100nF 50V ceramic capacitor between OUT1 and OUT2 of motor driver to reduce noise. Do you recommend it?
3. Do I need external flyback/clamp diodes for back emf protection when using DRV8837?
4. The board is powered from 1S Lipo battery. I am using buck converter to convert input voltage to 3.3V motor voltage. Do you have some other recommendations to protect +3V3_Motor power path or it is enough to put some bulk capacitor on VM line?
Thank you in advance for your help,
Best regards,
Ahmet
