LM2904YST

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LM2904YST is an high-performance integrated circuit in the linear-amplifiers-instrumentation, OP amps, and buffer amps categories. It is a single, monolithic circuit that provides motor control for speed, position and torque feedback in various types of brushed, brushless, and stepper motors.

LM2904YST is a differential amplifier with a gain bandwidth of up to 20MHz and a high output current capability of 45mA. It includes an internal mute circuit, allowing it to be disabled or enabled with a single control signal. The part has a quiescent current of just 3mA and can be operated from a single 5-volt supply.

LM2904YST makes use of two main integrated components - the amplifier and the linear motor control circuits. The amplifier provides a high-gain differential input to the motor control circuits. This allows for the control of current and voltage levels, providing precision control and feedback of motor position, speed, and torque.

The linear motor control circuits include a dual voltage-to-current converter, which provides a high-precision output voltage as feedback to the amplifier. The combination of these two components ensures a highly accurate, stable and low-noise motor control. The amplifier can be used to deliver current to the motor in one of three basic modes: direct voltage control, speed control, or torque control.

In direct voltage control mode, the amplifier acts as a voltage regulator, providing a constant current to the motor, regardless of motor speed or load. Speed and torque control signals are typically applied to the amplifier’s input to accurately control the motor’s speed and torque. Both input signals are monitored by the amplifier and converted into feedback signals. These feedback signals are then used to adjust the output voltage, as well as the motor’s speed and torque.

In addition to its motor control features, the LM2904YST also provides additional features, such as over-temperature and over-current protection. The part also has programmable output current limit, which can be used to limit the maximum output current and prevent damage to the motor or the circuit.

In summary, the LM2904YST is a high-performance, single-chip integrated circuit, providing precision motor control and feedback for brushed, brushless, and stepper motors. Its combination of differential amplifier and linear motor control circuits provides a high-precision output voltage and fast response time, enabling users to control the speed, position and torque of the motor accurately and reliably. The part also includes additional features, such as over-temperature, over-current, and programmable output current limit protection, making it suitable for use in a wide variety of applications.

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