A3935KJP-T

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A3935KJP-T, classified as a PMIC – Motor Drivers, Controllers, is one of the many integrated circuits supplied by Allegro MicroSystems. This integrated circuit from Allegro is developed specifically for high-performance, low-cost DC Brush Motor Control applications. It facilitates the smooth running of the brush motor by providing over-current protection and current sensing to perform the job of the external H-bridge motor driver efficiently. It also has a small foot print and comprises of the necessary components under one ic package.

The main application field of the A3935KJP-T is automotive applications. It is primarily designed to reduce power losses in the vehicle and help reduce the size of the control electronics. This integration helps to reduce the cost of the vehicle and make it more attractive to the consumer. It is also suitable for various industrial, consumer and medical applications.

The primary advantage of this integrated circuit is its high system efficiency, reducing power dissipation while prolonging battery life. It also reduces the motor current noise, thus enhancing motor performance. The pulse-width modulation (PWM) implementation provides smooth transition from low PWM frequency to high PWM frequency and also takes full advantage of the available motor speed.

The features of the A3935KJP-T includes includes adjustable slew rate limited current control, over-current protection and simultaneous power down for both gate control output (OE) and enable input (SCE). It also features thermal shutdown protection and internal charge pump for the gate control output (OE).

The working principle of the A3935KJP-T is the same as the normal external H-bridge driver, but with a few enhancements. In normal H-bridge motor driver, the motor is switched ON or OFF when the enable (EN) line is asserted. In the A3935KJP-T, the enable (EN) line is used to control the speed of the motor. The enable input (EN) voltage level determines the PWM frequency, which in turn determines the motor speed. When the enable voltage (EN) is high, the PWM frequency is low and the motor runs at slow speed, while when it is low, the PWM frequency is high and the motor runs faster.

In the A3935KJP-T, the gate outputs (OE) are controlled by an internal charge pump, eliminating the need for an external charge pump. The internal charge pump increases the gate voltage to drive the power MOSFETs during the power up sequence. This in turn reduces the power dissipation and increases the system efficiency.

The current is controlled by the adjustable slew rate limits, which reduces the gate current and power losses. The over-current protection feature of the A3935KJP-T senses a high current and reduces the gate voltage to below the limit and turns OFF the MOSFETs. This stops the motor as soon as it senses over-current.

The A3935KJP-T is an excellent motor control solution, as it has all the necessary features and low power consumption. Its low power dissipation and high-performance make it suitable for automotive, industrial and medical applications.

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