The internal overcurrent protection (OCP) threshold is 1.6A typical at 12V supply +25☌. It will remain in standby mode until the junction temperature falls by +30☌. The thermal shutdown is triggered when the junction temperature of the device reaches +170☌. The device has an internal thermal shutdown to prevent a thermal runaway scenario. Fault Protection – RANGE Short to GND, Supply, or Broken Wires.Wide Operating Voltage Range: 8V to 18V.Note: Read the datasheet to learn more about defining the hysteresis window, it is advisable to solder a 0.1uF capacitor across the motor +/- terminal for noise decoupling. Overtemperature shutdown provides thermal protection for the device. The overcurrent protection monitors the output current and shuts down the outputs stage with periodic retry to help protect the coil from device burnout. In case of supply undervoltage and overvoltage, the device shuts down the output drive to help prevent overvoltage stress on the coil. To help protect the motor coil, the ZXBM5409Q provides fault condition protection, such as RANGE input short to GND, short-to supply voltage, or broken wires, by stopping the motor and disconnecting the output stage. For system flexibility, the servo controls forward and reverse hysteresis, dead band, and angle amplification are easily programmable by external resistors. To simplify the circuit design and minimize external components, the device integrates voltage and temperature-compensated internal references, amplifiers, and output H-bridge power switches with low RDSON. The integrated full-bridge driver output stage is composed of high-current, low-RDSON H-bridge MOSFETs to maximize efficiency. The project is based on the ZXBM5409Q chip from Diode Incorporation which is a protected H-bridge driver designed specifically for manual automotive headlight-beam control and industrial servo control applications with DC-brush motor loads. Multi rotation is possible with the help of a multiturn potentiometer. This will provide a maximum rotation of 270 degrees. When the reference pot is turned, the motor shaft will follow the potion. The project requires a special mechanism, where the DC motor’s output shaft is mechanically couple with the potentiometer shaft using a reduction gear. Can be used in applications such as side mirror movement control for cars, car head lamp beam control, animatronics, robotics, etc. The project is ideally suited for almost any servo positioning application. This project provides all necessary active functions for a closed-loop servo system using a Brushed DC Motor and potentiometer mounted on the output shaft of the DC Motor with Gear. The active PWM pin decides the motor direction of rotation (one at a time, the other output is logic 0).The project presented here is a low-cost position control closed-loop analog-servo using brushed DC motor and potentiometer as feedback. Pins 9 and 10 are PWM signal outputs, at any time there is only 1 active PWM, this allows us to control the direction as well as the speed by varying the duty cycle of the PWM signal. Pins IN1 and IN2 are the control pins where: IN1Īs shown in the circuit diagram we need only 3 Arduino terminal pins, pin 8 is for the push button which toggles the motor direction of rotation. The L293D driver has 2 VCCs: VCC1 is +5V and VCC2 is +12V (same as motor nominal voltage). If the button is pressed the motor will change its direction directly. The speed of the DC motor (both directions) is controlled with the 10k potentiometer which is connected to analog channel 0 (A0) and the direction of rotation is controlled with the push button which is connected to pin 8 of the Arduino UNO board.
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