LM2903P

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LM2903P Linear - Comparators

The LM2903P is a dual voltage comparator, provide an economical solution for logic level compare applications. It is generally used in applications that require accurate logic-level translation between two different voltage levels. In addition, it can be used in AC/DC motor control, AM/FM modulation, switched-mode power supplies and tachometer circuits. This device is provided in a variety of packages, such as SOIC-8, or the more efficient TO-220F or PAK-8 packages.

Application Fields

The LM2903P can be used in various applications, including:

• Voltage Level/Logic Translation – This is the main application for this comparator, providing a simple and reliable way to compare two different voltage levels. This can prove very useful for controlling switches and motors with different voltage levels.
• Transition Detection – One of the core features of the LM2903P is its ability to detect the difference between two input voltages. This can be used in applications such as transitioning between AC and DC power sources, monitoring the load on a motor, or detecting changes in temperature.
• Power Supply Control – The LM2903P can be used in power supply control systems, to monitor the power going to a motor or other device. This can be used to provide a stable and reliable power source, or to regulate the power output of a device.
• Tachometer Applications - The LM2903P can be used to create tachometers, which measure the speed of a motor or other device. This is useful for precision applications, such as controlling the speed of a spinning disk or controlling the dynamics of a robotic arm.

Working Principle

The LM2903P is a dual voltage comparator, compare two input voltages and provides an output indicating the comparison result. It does this by comparing the inputs at the non-inverting (positive) and inverting (negative) inputs, generating a high output if the non-inverting input is greater than the inverting input. The LM2903P’s operation is based on a series of resistors and two switching transistors, which are biased by the two input voltages. The transistors switch on or off which in turn switches the output pin.

The LM2903P has an adjustable hysteresis control, allowing the user to customize and optimize the device performance. The hysteresis is adjusted using a variable resistor connected to the non-inverting input. The amount of hysteresis is determined by the resistance value, with a higher resistance providing more hysteresis.

The LM2903P also has a slew rate control feature, which allows the user to adjust the rate at which the output switches from high to low or low to high. This feature can be used to minimize glitches and improve system performance, especially in high-speed applications.

The LM2903P is also protected from over-voltage and short-circuit conditions. It has built-in protection circuitry, which will activate if the input voltages exceed their maximum ratings, or if a short circuit is detected.

Conclusion

In conclusion, the LM2903P is a versatile and economical comparator, capable of performing a variety of logic-level compares. Its adjustable hysteresis control and slew rate control features make it especially useful in applications that require precise voltage level control. Its over-voltage and short-circuit protection make it a safe and reliable choice for a wide range of applications.

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