A3940KLP-T

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PMIC - Motor Drivers, Controllers

The A3940KLP-T is a high performance, brushless DC motor driver designed specifically for automotive and battery-powered applications. It is designed to provide full three-phase control of the motor in both speed and direction control. It is designed to drive brushless DC (BLDC) motors with Hall-commutated trapezoidal style waveforms at up to 50 kHz PWM switching frequency.

Application Field

The A3940KLP-T is suited for automotive and battery-powered applications such as automotive seat adjustment motors, cooling fan motors, or fuel injectors. It is also suitable for clean energy applications such as ESCs(Electric Speed Controllers) in brushless motors for aerial vehicles and renewable energy systems, including solar, wind and hydro power.

Working Principle

The A3940KLP-T utilizes advanced mixed-signal microcontroller technology with advanced analog and digital power-management techniques. It is designed to provide efficient, low-cost control of brushless DC motors with Hall-commutated trapezoidal waveforms. The device incorporates a number of features to allow a higher level of integration than other motor drivers. These features include advanced current regulation and protection, adjustable PWM frequency and duty-cycle range, low-voltage operation and low-power standby.

The device integrates a high-performance three-phase brushless DC motor control block, consisting of a three-phase power stage with integrated MOSFET transistors and a single-chip microcontroller. The current in each phase is monitored and regulated using a highly integrated, fast-response current regulator. The driver provides the capability to program the switching frequency, dead time, soft start, coast time and operating temperature.

The A3940KLP-T utilizes an integrated PWM controller, which operates in a “split-phase” manner. This splits the 180 degree control space into two circuits. There are two half-bridge power devices used for each phase, with one switching the high side and the other switching the low side devices. The switching of the two half-bridge devices is synchronized and timed according to the given PWM signal. The timing of the switching is adjustable by programming the PWM frequency, duty cycle and dead time.

The device also has additional features such as current-sense circuit, undervoltage and thermal shutdown, overcurrent protection and fault reporting. The combination of current regulation, protection and fault reporting makes this an ideal solution for battery powered applications.

The A3940KLP-T is an easy-to-use, low-cost device that is designed to provide efficient and reliable motor control of brushless DC motors with Hall-commutated trapezoidal waveforms. It is well suited for automotive and battery-powered applications, and offers a high level of integration for cost and size savings.

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