L6228N

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PMIC (Power Management Integrated Circuit) refers to a specialized system-level chip that integrates multiple functions such as power management, motor control, data conversion and display control. Examples of PMICs include the L6228N motor driver, controller, and converter. This paper will discuss the application fields and working principles of L6228N PMIC.

Application Fields and Features of L6228N PMICs

The L6228N is a low-voltage 8-bit PMIC. This device is designed to control piezoelectric motors and provide a wide range of motion control such as position control, velocity control, and direction control. The chip is ideal for piezo motors of various specifications including bipolar, unipolar, and stepping motors. Additionally, its motion control capabilities can be enlarged by cascading two or more of the same type of PMICs into a single unit.

The L6228N PMIC provides three main features for controlling piezo motors. First, it includes a built-in PWM (pulse width modulation) signal amplifier and generator that can be programmed for efficient motor control. Second, it includes a motor current measurement and protection circuit, which allows for accurate current feedback and pre-set current limits for motor protection. Additionally, the device includes an OS/ER (over-speed/emergency-stop) signal monitoring circuit for lightweight and fast protection against dangerous motor conditions.

This PMIC is also equipped with several power management functions, such as thermal shutdown, under-voltage lockout (UVLO), over-voltage protection (OVP), and reverse current protection (RCP). Its low-voltage operation and support for higher operating voltages, up to 60V, make it suitable for a wide range of power systems.

Working Principle

As mentioned earlier, the L6228N PMIC provides a wide range of motion control capabilities by using pulse width modulation (PWM). PWM is an efficient way of controlling the rotary speed, torque, or power of a motor by rapidly switching it on and off. This technique allows for the frequency of the signal to be adjusted to the desired motor speed.

The L6228N uses a three-phase drive scheme for its PWM signal generation. This includes a high-side drive, low-side drive, and low-side short circuit protection. It uses a high-side drive (HSD) to control the switching of the motor and a low-side drive (LSD) to protect the motor from short circuit currents. The use of these two drive techniques allows for an efficient and safe power control scheme.

The L6228N also features several protection features, such as thermal shutdown, UVLO, OVP, under-voltage protection (UVP), and reverse current protection (RCP). Thermal shutdown helps protect the chip and motor from over-heating, while UVLO prevents the chip from functioning if the voltage drops below a certain threshold. OVP helps ensure that the HSD is not exceeding the specified voltage rating of the motor. UVP and RCP help to protect the PMIC and motor from related risks.

Conclusion

The L6228N is a low-voltage 8-bit PMIC with a wide range of motion control and power management capabilities. The device includes a built-in PWM signal amplifier and generator, motor current measurement and protection circuit, and OS/ER signal monitoring. Additionally, the chip comes with several protection features such as thermal shutdown, UVLO, OVP, UVP and RCP. This makes the L6228N PMIC suitable for a range of power systems and applications.

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