TB6631FNG,EL

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PMIC (Power Management ICs) is a broad category of ICs used in many different applications. One such application is motor control – controlling the drive and current of motor systems. A popular device that falls in this category is the TB6631FNG motor driver. This device is designed to provide higher torque and drive current with improved accuracy and high-frequency operation. This application note describes the various application fields and working principle of the TB6631FNG.

General Overview

The TB6631FNG is a single-chip motor driver for Pulse-Width Modulated (PWM) control of two-phase stepper motors and DC brushless motors. It is designed to be used in two-phase, two-phase plus commutator, and half-step drive modes. It can drive load currents of up to ±7A (with optional external MOSFETs). The device also includes over-temperature and over-current protection, as well as an integrated sleep mode.

Application Fields

The TB6631FNG can be used in many different applications requiring motor drive control. These include:

• Industrial automation systems
• Home automation systems
• Robotics
• Office equipment
• Barcode readers
• Medical equipment

Working Principle

The TB6631FNG works by using a PWM waveform to control the current through the motor. A PWM waveform is a waveform consisting of narrow pulses of constant high-level (Vdd) separated by wider intervals of low-level (GND) voltage. By manipulating the duty cycle of the waveform, the current through the motor can be varied. The device is driven directly from a logic-level signal, meaning that low-level PWM signals can be used for the control of the motor drive.

The device is built around two integrated H-bridges. Each bridge is capable of driving a separate phase of the motor. The bridge is driven by the PWM signal, and the current through the motor is controlled by the duty cycle of the waveform. The device also includes an integrated set/reset flip-flop (SRFF) and current sensing circuit. This circuit is used to detect and limit the maximum current through the H-bridge, thus providing protection against over-current conditions.

Conclusion

The TB6631FNG is a versatile motor driver designed for use in many different motor control applications. It can be used to drive two-phase stepper motors and DC brushless motors without the need for external MOSFETs. The device can provide load current up to ±7A, and includes over-temperature and over-current protection. The device is driven directly from a logic-level signal and is simple to implement and configure.

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