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DRV2603 Datasheet(PDF) 9 Page - Texas Instruments |
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DRV2603 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 19 page Input Output Drive 3.3 V 0 V 0% 50% 100% -3.3 V PWM Input Duty Cycle DRV2603 www.ti.com SLOS754A – JUNE 2012 – REVISED JANUARY 2014 ECCENTRIC ROTATING MASS MOTORS (ERM) Eccentric Rotating Mass motors, or ERMs, are typically DC-controlled motors of the bar or coin type. ERMs can be driven in the clockwise direction or counter-clockwise depending on the polarity of voltage across its two terminals. Bi-directional drive is made possible in a single-supply system by differential outputs that are capable of sourcing and sinking current. This feature helps eliminate long vibration tails which are undesirable in haptic feedback systems.. Figure 13. Reversal of Motor Direction Another common approach to driving DC motors is the concept of overdrive voltage. To overcome the inertia of the motor's mass, they are often overdriven for a short amount of time before returning to the motor's rated voltage to sustain the motor's rotation. Negative overdrive is also used to stop (or brake) an ERM quickly by reversing the magnetic field of the driving coil(s). ERM MODE The DRV2603 is a compact, cost-effective driver solution for ERM motors. Most competing solutions require external components for biasing or level-shifting, but the DRV2603 requires only one decoupling capacitor giving a total approximate circuit size of 2 mm by 2 mm. This small solution size still comes packed with features such as a level-shifted input, differential outputs for braking, constant drive strength over supply, edge rate control, and a wide input PWM frequency range. When in ERM mode, the DRV2603 employs a simple control scheme. A 100% input duty cycle gives full-strength forward rotation, a 50% input duty cycle give no rotation strength, and a 0% duty cycle give full-strength reverse rotation. Forcing the motor velocity towards reverse rotation is used to implement motor braking in ERMs. By stringing together various duty cycles over varying amounts of time, a haptic motor control signal will be constructed at the output to precisely drive the motor. Figure 14. ERM Mode Copyright © 2012–2014, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links :DRV2603 |
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