STK672-630A-E

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Pulse-width modulation (PWM) motor drivers and controllers offer several advantages over traditional low-voltage drive systems. By controlling current, not voltage, they can improve efficiency, reduce heat and consumption, and extend the power supply or battery life. PMICs like the STK672-630A-E, a high efficient brushed DC low voltage motor driver, can help reduce design complexity and cost, while providing a fully integrated solution for driving low-voltage brushed DC motors.

The STK672-630A-E is a fully integrated brushed DC motor driver that includes dual low-on resistance (low RON) N-MOSFETS and a current Sense Amplifier (CSA). It also incorporates a liquid crystal display (LCD) driving transistor, a gain setting resistor, an over-current protection circuit, and a band-gap voltage reference. This PMIC is designed to drive a wide range of low-voltage DC motors, with features such as optimal switching frequency, suitable sense current limits, and low RON on both channels.

The STK672-630A-E motor driver features a low-voltage operating range of 4.5-14V, a wide switching frequency range of 100kHz-2MHz, and a maximum load current of 6.3A. With this device a user can easily set up the gain level through the combination of the current sense amplifier and adjustable gain setting resistor. The driver also offers an over-current protection circuit, along with adjustments for start-up current, pull-in time and current limit.

The STK672-630A-E can be applied in several motor control applications such as robot control, motor control systems, motor starters and power supplies. It is also suitable for industrial applications, including cooling fans and drives, exhaust fans, blowers, and sump pumps. The device can be used in combination with already existing microcontrollers or can be implemented in standalone applications.

The working principle of the STK672-630A-E is that it controls the flow of current through its low RON n-channel MOSFETs. It has two half-bridge circuits that can be used together for driving single DC motors, or separately for dual-direction motors. The signals for each of the bridges are derived from the current sense amplifier, which has adjustable gain settings for proper current sensing, and includes a protection circuit for preventing over-current from damaging the circuit.

In addition, during operation the driver measures the current sense voltage and compares it to the reference voltage. If the sensed current is higher than the reference voltage, it will turn off the power devices until the current drops below the reference level. In this way, the motor driver can safely prevent the over-current protection circuit from activating and protect the motor and the entire system.

In conclusion, the STK672-630A-E motor driver is a fully integrated, efficient, complex, and high cost-performance motor driver. It is suitable for low-voltage DC motor control applications such as robot control, motor control systems, motor starters, and power supplies. By using PWM control and its current sensing circuit, it can achieve precise motor control and offers an adjustable over-current protection. It provides an ideal solution for reducing design complexity and cost in low-voltage DC motor applications.

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