L6474HTR Integrated Circuits (ICs)

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Motor controllers are an essential part of modern electronics, and the L6474HTR is one of the most reliable and versatile drives available today. It is a highly integrated controller with a wide range of applications and features such as current monitoring, PWM control, over-current protection and adjustable speed control. This article explores the application field and working principle of the L6474HTR motor controller.

The L6474HTR is an effective power management unit specially designed to drive small DC motors in automotive and industrial applications. It has a wide operating range spanning -40°C to +125°C. The device is available in a 9-pin, 1.27 mm x 1.27mm flat no-lead (FN) package. It is EMC compliant, RoHS-compliant and requires no external components for operation. The L6474HTR combines a low-side driver, two high-side drivers, an advanced current sensing circuitry, a PWM control, an over-current protection system, and an adjustable speed control.

Working Principle

The primary focus of the L6474HTR is its ability to drive small motors. It has a power MOSFET half-bridge output stage, enabling it to provide high-voltage outputs, up to 80V. The device is also equipped with a power MOSFET half-bridge current sensing circuitry. Input voltage is applied to the half-bridge, which drives the motor to rotate in one direction. When the current reaches the set threshold, it is detected and the output is switched off. The device then switches between the two outputs and the motor rotates in the opposite direction with a different set threshold.

The L6474HTR also features a Pulse Width Modulation (PWM) control system, which allows the speed of the motor to be adjusted according to the user’s preference. PWM control is often used to reduce unwanted power consumption and to manage operating temperature. The device also has an over-current protection system, which automatically shuts down the motor when an over-current is detected.

Applications

The primary applications for the L6474HTR motor controller include automotive and industrial applications. The device can be used in a variety of applications, including automotive starter motors, small DC motors, automotive fan motors, automotive light dimmers, industrial pumps, and other hand-held motors. The device is also suitable for low-power motor control applications, such as motorized toys, fans, and robotic applications.

Conclusion

The L6474HTR motor controller is a highly versatile device, capable of driving small DC motors in a wide range of applications. Its features include a power MOSFET half-bridge output stage, a power MOSFET half-bridge current sensing circuitry, PWM control, over-current protection, and adjustable speed control. It is suitable for automotive and industrial applications and can be used in a variety of low-power devices, including toys, fans, and robotic applications.

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