Texas Instruments
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LM431ACMX/NOPB
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LM431ACMX/NOPB

Product Overview

Category: Integrated Circuits (ICs)

Use: Voltage References

Characteristics: - Adjustable Precision Shunt Regulator - Programmable Output Voltage - Low Dynamic Output Impedance - Wide Operating Current Range - Low Temperature Coefficient - Fast Turn-On Response - Low Output Noise

Package: SOT-23

Essence: The LM431ACMX/NOPB is a precision shunt regulator that can be used to provide a stable reference voltage. It is commonly used in various electronic circuits where a precise voltage reference is required.

Packaging/Quantity: The LM431ACMX/NOPB is available in a SOT-23 package and is typically sold in reels of 3000 units.

Specifications

  • Reference Voltage: Adjustable from 2.5V to 36V
  • Operating Current Range: 1mA to 100mA
  • Temperature Range: -40°C to +85°C
  • Line Regulation: 0.2% (Typical)
  • Load Regulation: 0.4% (Typical)
  • Output Voltage Noise: 0.04% (Typical)
  • Cathode Current: 1mA to 100mA

Pin Configuration

The LM431ACMX/NOPB has three pins:

  1. Anode (A): Connected to the positive supply voltage.
  2. Cathode (C): Connected to the load or ground.
  3. Reference (R): Provides the adjustable reference voltage.

Functional Features

  • Adjustable Output Voltage: The LM431ACMX/NOPB allows the user to set the output voltage according to their requirements by using external resistors.
  • Precision Voltage Reference: It provides a stable and accurate reference voltage, making it suitable for applications requiring precise voltage regulation.
  • Low Dynamic Output Impedance: The LM431ACMX/NOPB maintains a low output impedance, ensuring stability and reducing the impact of load variations.
  • Fast Turn-On Response: It has a fast response time, allowing for quick regulation of the output voltage.
  • Wide Operating Current Range: The LM431ACMX/NOPB can operate within a wide range of current levels, making it versatile for various applications.

Advantages

  • High precision and accuracy in voltage regulation.
  • Easy to use and configure.
  • Wide operating temperature range.
  • Low output noise.
  • Small package size allows for space-saving designs.

Disadvantages

  • Requires external resistors for voltage adjustment.
  • Limited maximum output current capability.
  • Sensitive to voltage spikes and transients.

Working Principles

The LM431ACMX/NOPB operates as a shunt regulator. It compares the reference voltage at the Reference (R) pin with the voltage across the cathode (C) and anode (A) pins. By adjusting the resistance connected to the Reference pin, the output voltage can be set to the desired value. The LM431ACMX/NOPB then regulates the voltage across the cathode and anode pins to match the reference voltage.

Detailed Application Field Plans

The LM431ACMX/NOPB is widely used in various applications, including:

  1. Voltage regulators and power supplies
  2. Battery charging circuits
  3. Audio amplifiers
  4. Instrumentation and measurement equipment
  5. Industrial control systems
  6. LED lighting systems
  7. Automotive electronics

Detailed and Complete Alternative Models

Some alternative models to the LM431ACMX/NOPB include:

  1. TL431: Similar adjustable precision shunt regulator with different package options.
  2. LM4040: Precision voltage reference with fixed output voltages.
  3. LT1009: Precision reference with low temperature coefficient and high accuracy.

These alternative models offer similar functionality and can be used as substitutes depending on specific requirements.

Word count: 525 words

Noem 10 veelgestelde vragen en antwoorden met betrekking tot de toepassing van LM431ACMX/NOPB in technische oplossingen

  1. What is the LM431ACMX/NOPB?

    • The LM431ACMX/NOPB is a programmable shunt voltage reference that can be used in various technical solutions.

  2. What is the typical application of LM431ACMX/NOPB?

    • The LM431ACMX/NOPB is commonly used as a precision voltage reference in power supplies, battery management systems, and voltage regulators.

  3. What is the operating voltage range of LM431ACMX/NOPB?

    • The LM431ACMX/NOPB has an operating voltage range from 2.5V to 36V.

  4. How does LM431ACMX/NOPB contribute to circuit protection?

    • The LM431ACMX/NOPB can be used to monitor and control voltage levels, providing overvoltage protection in circuits.

  5. Can LM431ACMX/NOPB be used for temperature compensation?

    • Yes, the LM431ACMX/NOPB can be employed for temperature compensation in various electronic circuits.

  6. What are the key features of LM431ACMX/NOPB?

    • The LM431ACMX/NOPB offers a low dynamic impedance, wide operating temperature range, and high accuracy.

  7. How is LM431ACMX/NOPB programmed for specific voltage references?

    • The LM431ACMX/NOPB can be programmed by selecting appropriate external resistors to set the desired voltage reference.

  8. Does LM431ACMX/NOPB require external components for operation?

    • Yes, the LM431ACMX/NOPB typically requires external resistors and capacitors for proper operation.

  9. What are the typical output voltage options for LM431ACMX/NOPB?

    • The LM431ACMX/NOPB can provide output voltage options ranging from 2.5V to 36V, depending on the application requirements.

  10. Can LM431ACMX/NOPB be used in automotive applications?

    • Yes, the LM431ACMX/NOPB is suitable for use in automotive electronics, such as voltage monitoring and regulation in vehicle systems.