Lianna Dicke MOTOR HARDWARE BREAKDOWN

Design Goals: Drive DC motor that draws 5 A maximum continuous current Voltage operation at 12 Volts (automotive) Low cost Possibility of being driven in both directions Commands will come from Teensy 3.1 controller Commands will include PWM and direction control Due to a major design scope change (new actuator), a detailed schematic is not included in this documentation

DRV8701: Gate Driver Teensy 3.1 Commands H-BRIDGE MOTOR POSITION SENSOR High Level Block Diagram

This is a high level diagram of the functionality of the motor driver hardware (Provided by Texas Instruments) H-Bridge to Motor Connections: connected to four NMOS power transistors, which are capable to handle 5A Reverse Supply Protection: if hooked up backwards, there will not be any current going through the H-Bridge DRV8701 Speed Sensor: indicates how much current is going through

H-Bridge Directional Flow

Texas Instrument Gate Driver Chip: DRV8701 The internals of the chip Inputs from Teensy 3.1 Outputs for Teensy 3.1: Open Collector H-Bridge to Motor Connections: Power Stage Power Generation: Control Logic Power Differential Amplifier: reads out a voltage due to Rsense and feedbacks to Outputs and Logic that controls the Gates

Layout Design Goal (Provided by TI)

Land Pattern Data : (Footprint) Recommendation from TI: Add thermal pad under IC; add vias to distribute thermal energy

Hardware Implementation: Prototype