68418-406HLF

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The 68418-406HLF is a gate drive power amplifier and microstepping motor driver designed to control current in small- and medium-sized 3-phase bi-polar stepper motors. The device is powered by a single-phase supply up to 44 VDC. A single 68418-406HLF can drive motors up to 2 A rms coil current, or in pairs up to 4 A rms. The device provides a motor control solution that is flexible in either unipolar or bi-polar motors.

The 68418-406HLF incorporates microstepping for smoother motor motion, both in step-and-direction or time division multi-stepping modes. The microstepping resolution can be adjusted via the Vadj pin within the range of 1/2, 1/4, 1/8, 1/32, and 1/128. Additionally, the 68418-406HLF incorporates automatic current control loops which are configured via external resistors. This ensures that the current in all phases of the motor remain stable and within rated limits.

The 68418-406HLF is a single chip amplifier that offers a 3-phase motor control solution with a single-phase supply. It combines microstepping with dynamic current control, ensuring reliable and accurate motor control. The device is a good choice for applications such as industrial automation, robotics, home automation, vending machines, and other applications that require accurate motor control.

The 68418-406HLF uses a peak current foldback method to control the motor current. This method provides both fast dynamic response and a simple current control loop configuration. The device operates in the region of current limiting, with the maximum current determined by the external resistors connected to the Vadj pin. The current can be tuned within the range of 100mA to the full rated supply current. Once the external resistor is selected, the device self-adjusts the current every two PWM cycles.

The 68418-406HLF also offers a motor speed control mode. This mode is enabled by connecting the SD pin to a frequency generator, such as a pulse-width modulation (PWM) signal. The device allows for speed control range of up to a factor of 2, depending on the PWM frequency. The 68418-406HLF also offers automatic current limiting in this mode.

The 68418-406HLF can be used in a variety of applications, such as industrial automation, robotics, home automation, vending machines, medical equipment, and other applications that require accurate motor control. Its advantages include fast dynamic response, low power dissipation, and simple resistor-based current control. This device is also highly reliable, making it suitable for harsh operating conditions.

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