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Projects, Designs, and Technical Stuff / DRV8251 DC Brushed Motor Driver
« Last post by Tnixsw on Today at 12:42:59 am »Hi all,
I was looking at using this device for a project that uses a 5V brushed DC motor for a printer mechanism.
The device data sheet mentions that PWM can be used for speed control and that switching between driving and braking typically works best. This method allows full access to the current sense feature, which is not available during all switches OFF - (motor coasting).
This seems contradictory to me as you are trying to drive the motor and then stop it in a single PWM period.
I tried this and the motor doesn't seem happy.
I would have thought the current sense might have been better utilized during coasting for speed control feedback by using the back EMF of the motor.
I thought if someone has already used this device, they could share some experience.
cheers
Tony
I was looking at using this device for a project that uses a 5V brushed DC motor for a printer mechanism.
The device data sheet mentions that PWM can be used for speed control and that switching between driving and braking typically works best. This method allows full access to the current sense feature, which is not available during all switches OFF - (motor coasting).
This seems contradictory to me as you are trying to drive the motor and then stop it in a single PWM period.
I tried this and the motor doesn't seem happy.
I would have thought the current sense might have been better utilized during coasting for speed control feedback by using the back EMF of the motor.
I thought if someone has already used this device, they could share some experience.
cheers
Tony