L78M09ABV

Product Overview

• Category: Voltage Regulator
• Use: To regulate and stabilize the output voltage in electronic circuits
• Characteristics:
  • Fixed output voltage of 9V
  • High accuracy and low dropout voltage
  • Thermal overload protection
  • Short-circuit protection
• Package: TO-220
• Essence: Integrated circuit voltage regulator
• Packaging/Quantity: Available in reels or tubes, quantity varies based on manufacturer

Specifications

• Input Voltage Range: 11V to 35V
• Output Voltage: 9V
• Output Current: Up to 500mA
• Dropout Voltage: 2V (typical)
• Line Regulation: ±0.2% (typical)
• Load Regulation: ±0.4% (typical)
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The L78M09ABV has three pins:

1. Input Pin (VIN): Connects to the input voltage source.
2. Ground Pin (GND): Connected to the ground reference of the circuit.
3. Output Pin (VOUT): Provides the regulated output voltage.

Functional Features

• Voltage Regulation: The L78M09ABV maintains a constant output voltage of 9V, regardless of changes in the input voltage or load conditions.
• Thermal Overload Protection: The device includes built-in thermal shutdown circuitry that protects it from overheating.
• Short-Circuit Protection: In case of a short circuit, the L78M09ABV limits the output current to prevent damage to the device and the connected circuitry.

Advantages and Disadvantages

Advantages: - High accuracy and stability in regulating the output voltage. - Wide input voltage range allows for versatile applications. - Thermal and short-circuit protection enhance reliability and safety.

Disadvantages: - Limited output current capacity (up to 500mA). - Dropout voltage of 2V may not be suitable for low-power applications.

Working Principles

The L78M09ABV is a linear voltage regulator that uses a series pass transistor to regulate the output voltage. It compares the output voltage with a reference voltage and adjusts the pass transistor accordingly to maintain a constant output voltage of 9V. The device dissipates excess voltage as heat, which is why it has a dropout voltage.

Detailed Application Field Plans

The L78M09ABV finds applications in various electronic circuits where a stable 9V power supply is required. Some common application areas include:

1. Audio Amplifiers: Provides a regulated power source for audio amplifiers, ensuring consistent performance.
2. Microcontroller Systems: Used to power microcontrollers, ensuring reliable operation.
3. Battery Chargers: Regulates the charging voltage for batteries, preventing overcharging and damage.
4. LED Lighting: Supplies a stable voltage to LED lighting systems, ensuring consistent brightness.

Detailed and Complete Alternative Models

1. LM7809: Similar voltage regulator with a TO-220 package.
2. MC7809: Another alternative with similar specifications and pin configuration.
3. UA7809: Integrated circuit voltage regulator with a fixed 9V output.

These alternative models offer similar functionality and can be used as substitutes for the L78M09ABV in various applications.

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