STMicroelectronics
La imagen puede ser una representación.
Consulte las especificaciones para obtener detalles del producto.
LM317LZ-AP
Ver Detalle Hojas de datos

LM317LZ-AP

Product Overview

Category

The LM317LZ-AP belongs to the category of voltage regulators.

Use

It is primarily used for regulating and controlling voltage levels in electronic circuits.

Characteristics

  • Adjustable output voltage
  • High current capability
  • Low dropout voltage
  • Thermal overload protection
  • Short circuit protection

Package

The LM317LZ-AP comes in a TO-92 package, which is a small plastic package with three leads.

Essence

The essence of the LM317LZ-AP is its ability to provide a stable and adjustable output voltage, making it suitable for various applications.

Packaging/Quantity

The LM317LZ-AP is typically available in reels or tubes, with quantities varying depending on the supplier.

Specifications

  • Input Voltage Range: 3V to 40V
  • Output Voltage Range: 1.2V to 37V
  • Output Current: Up to 100mA
  • Dropout Voltage: 1.5V (typical)
  • Line Regulation: 0.01%/V
  • Load Regulation: 0.1%
  • Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The LM317LZ-AP has three pins:

  1. Adjust (ADJ): This pin is used to set the desired output voltage by connecting resistors.
  2. Output (OUT): The regulated output voltage is provided through this pin.
  3. Input (IN): The input voltage is supplied through this pin.

Functional Features

  • Adjustable Output Voltage: The LM317LZ-AP allows users to adjust the output voltage according to their specific requirements.
  • Overload Protection: It incorporates thermal overload and short circuit protection mechanisms to prevent damage to the device.
  • High Current Capability: The LM317LZ-AP can handle high current loads up to 100mA.

Advantages and Disadvantages

Advantages

  • Wide input voltage range
  • Adjustable output voltage
  • Thermal and short circuit protection
  • Easy to use and implement in various circuits

Disadvantages

  • Limited output current capability (up to 100mA)
  • Dropout voltage of 1.5V may not be suitable for low-power applications

Working Principles

The LM317LZ-AP is a three-terminal positive voltage regulator. It uses an internal reference voltage and feedback mechanism to maintain a stable output voltage. By adjusting the resistance connected to the ADJ pin, the output voltage can be set within the specified range.

Detailed Application Field Plans

The LM317LZ-AP finds applications in various fields, including:

  1. Power Supply Circuits: It is commonly used to regulate voltage in power supply circuits for electronic devices.
  2. Battery Charging: The LM317LZ-AP can be employed in battery charging circuits to control the charging voltage.
  3. Audio Amplifiers: It can be utilized in audio amplifier circuits to provide a stable voltage for powering the amplification stages.
  4. LED Drivers: The LM317LZ-AP can be used as a constant current source for driving LEDs.

Detailed and Complete Alternative Models

Some alternative models to the LM317LZ-AP include:

  1. LM1117: Similar to the LM317LZ-AP, but with lower dropout voltage and higher output current capability.
  2. LM7805: A fixed voltage regulator that provides a stable 5V output.
  3. LM2940: A low dropout voltage regulator suitable for low-power applications.

These alternative models offer different features and specifications, allowing users to choose the most appropriate one for their specific needs.

In conclusion, the LM317LZ-AP is a versatile voltage regulator with adjustable output voltage, high current capability, and various protection mechanisms. Its wide range of applications makes it a popular choice in the field of electronics.

Enumere 10 preguntas y respuestas comunes relacionadas con la aplicación de LM317LZ-AP en soluciones técnicas

Sure! Here are 10 common questions and answers related to the application of LM317LZ-AP:

  1. Q: What is LM317LZ-AP? A: LM317LZ-AP is a voltage regulator IC that can provide a regulated output voltage between 1.2V and 37V.

  2. Q: What is the maximum input voltage for LM317LZ-AP? A: The maximum input voltage for LM317LZ-AP is 40V.

  3. Q: How much current can LM317LZ-AP handle? A: LM317LZ-AP can handle a maximum current of 100mA.

  4. Q: Can LM317LZ-AP be used as a current regulator? A: Yes, LM317LZ-AP can be used as a current regulator by using an external resistor in series with the load.

  5. Q: How do I calculate the value of the external resistor for current regulation? A: The value of the external resistor can be calculated using Ohm's Law: R = Vref / I, where Vref is the reference voltage (1.25V) and I is the desired current.

  6. Q: Can LM317LZ-AP be used in both positive and negative voltage applications? A: No, LM317LZ-AP is designed for positive voltage applications only.

  7. Q: Is LM317LZ-AP suitable for high-power applications? A: No, LM317LZ-AP is not suitable for high-power applications due to its limited current handling capability.

  8. Q: Can LM317LZ-AP be used in battery charging circuits? A: Yes, LM317LZ-AP can be used in battery charging circuits by adjusting the output voltage to the desired charging voltage.

  9. Q: Does LM317LZ-AP require any external components for operation? A: Yes, LM317LZ-AP requires an input capacitor and an output capacitor for stability.

  10. Q: Can LM317LZ-AP be used in adjustable power supply designs? A: Yes, LM317LZ-AP is commonly used in adjustable power supply designs due to its ability to provide a wide range of regulated output voltages.

Please note that these answers are general and may vary depending on specific application requirements.