LB11651H-MPB-E

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The LB11651H-MPB-E is a pulse-width-modulation (PWM) integrated circuit (IC) which is used to control motors and other actuators. It is classified as a PMIC (Power Management Integrated Circuit) – Motor Drivers, Controllers, and is designed to interface with all variety of various boards and applications. This technical article introduces the basic application field and working principle of the LB11651H-MPB-E motor controller chip.

The LB11651H-MPB-E motor controller is designed for direct connection between motor, motor drive, and controller, eliminating additional components and costs. This fully integrated PWM IC contains all the necessary functions for motor control applications in one package, such as pulse width modulation (PWM), I/O ports, analogue comparator and other functional blocks, allowing both digital and analogue control of the power stage. Features of the LB11651H-MPB-E PWM IC include an internally optimized PWM algorithm, fast response time, improved power efficiency and reduced EMI.

The main application field of LB11651H-MPB-E motor controller are small motor with medium-weight size, such as automotive motor and industrial motor. Main application of the LB11651H-MPB-E motor controller include Fan Motor Drivers, Air Conditioner Motors, Home Appliances (Refrigerator/Air Conditioner/Washing Machine/Vacuum Cleaners/Salt and Pepper Grinders), and Audio Pre-amplifiers.

The LB11651H-MPB-E motor controller has a built-in power stage which block provides an efficient transmission of the required power and allows an increased current control across the entire range. The control signals can be input directly to the IC through the clock, PWM, and enable input pins. The enable pin is used to put the motor into sleep mode, while the clock and PWM pins are used to set the speed and torque of the motor, as well as its direction.

The internal comparator block allows the LB11651H-MPB-E motor controller to provide over-current protection and thermal shutdown protection for the motor. The motor current can be set by configuring a certain resistance between the current sense resistor and the MOSFET source pin. The higher the resistance, the lower the current, and vice versa. The internal protection circuit will shut down the motor if the current rises above a certain level, and the chip will indicate that an over current condition has occurred.

The LB11651H-MPB-E motor controller features two PWM outputs, Q1 & Q2, which can be used to drive a H-bridge type of MOSFET. The PWM signal output is controlled according to the internal algorithms and compares the speed error between the desired speed signal and the actual speed signal. The higher the speed error, the higher the PWM output, and vice versa. The internal PWM block feature a frequency adjustment, allowing the frequency of the output PWM signal to be adjusted according to the desired application\'s requirements.

In conclusion, the LB11651H-MPB-E motor controller is well-suited for small motor applications, such as motors in automotive, industrial, home appliance and audio amplifiers applications. The device integrated all the necessary functions for motor control, such as PWM, I/O ports, analogue comparator, and offer low EMI and higher power efficiency. Furthermore, the device contains an internal protection circuit to provide user with over-current and thermal shutdown protection.

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