LB1948MC-ZH Integrated Circuits (ICs)

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Motor control is a necessary for a variety of robotic, industrial automation, automotive, and other applications. Whether only controlling a single phase load or managing a multi-phase output to power a motor, a precise motor control circuit is often needed. The LB1948Master-Controller Zero-Hazard (LB1948MC-ZH) is a single-component solution that offers smooth speed control, excellent noise suppression characteristics, and robust protection against thermal overloads, power failures, and overcurrents.

The LB1948MC-ZH is a single-chip motor control and power supply solution for digital signal processing (DSP), microprocessor (MPU), digital signal controller (DSC) and other, that combines field-oriented control and phase protection with the necessary power supplies. It incorporates one PWM output, three phase current sense circuits, a low-side MOSFET gate driver, and reverse-voltage protection. The synchronous rectification control logic (SRC) offers high efficiency driving of the MOSFETs when running in excitation or direct current (DC) mode.

The LB1948MC-ZH is available in a tiny 8-pin package and offers a wide range of operating voltage with a negative differential resistance (NDR). It can provide up to 40V of peak VDS, up to 4kHz switching frequency, and up to 35A peak output current. It is an ideal solution for single and multi-phase motor control applications.

Applications

The LB1948MC-ZH is well-suited for controlling a wide range of DC and AC motors such as permanent magnet stepper motors, induction motors, brushless DC motors, as well as stepper motors rotating at relatively low speeds. It provides excellent low-speed torque, high switching frequency and adjustable protection features that can be adapted to various application requirements.

It is an ideal solution for applications such as robotic arms, factory automation, industrial variable speed drive applications, home appliance energy saving, automotive speed control. It also finds application in lighting equipment, medical equipment, security systems and renewable energy applications such as solar and wind power.

Working Principle

The LB1948MC-ZH is based on a field-oriented control (FOC) architecture, which enables smooth and precise control of speed and direction of motors. The control principle works by applying the voltage to each phase in the motor with the proper timing and magnitude. The LB1948MC-ZH uses a three-phase bridge rectification circuit to provide this voltage to the motor. The PWM output can be programmed to create the desired frequency and speed.

The LB1948MC-ZH also incorporates a high-side and low-side current sensing circuit that is used to detect an overload condition or a fault. In addition, the device incorporates over-voltage and under-voltage protection to protect the system from exceeding the operation range.

The LB1948MC-ZH can be further configured to control the direction of the motor in addition to controlling the speed. This is commonly referred to as a phase-reverse control, and can be used in applications such as driving a conveyor belt or a robotic arm.

Conclusion

The LB1948MC-ZH is a single-chip power supply and motor control solution for a wide range of motors. It has the ability to provide a wide-range of operating voltage with a negative differential resistance, up to 40V of peak VDS, up to 4kHz switching frequency, and up to 35A peak output current, while also offering excellent low-speed torque, high switching frequency and adjustable protection features. The LB1948MC-ZH is an ideal choice for motor control applications that require precise speed and direction control.

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