L7809ABV

Product Overview

• Category: Voltage Regulator
• Use: To regulate and stabilize the output voltage in electronic circuits
• Characteristics:
  • Fixed output voltage of 9V
  • Maximum output current of 1.5A
  • Low dropout voltage
  • Thermal overload protection
• Package: TO-220
• Essence: Integrated circuit (IC)
• Packaging/Quantity: Available in reels or tubes, quantity varies depending on supplier

Specifications

• Input Voltage Range: 11V to 35V
• Output Voltage: 9V ±4%
• Output Current: Up to 1.5A
• Dropout Voltage: 2V (typical)
• Quiescent Current: 6mA (typical)
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The L7809ABV has three pins:

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

Functional Features

• Voltage Regulation: The L7809ABV maintains a constant output voltage of 9V, regardless of changes in the input voltage or load conditions.
• Thermal Overload Protection: The IC includes built-in protection against excessive heat, preventing damage to the device.
• Short Circuit Protection: In case of a short circuit, the regulator shuts down to protect itself and the connected circuitry.

Advantages and Disadvantages

Advantages: - Easy to use and implement in various electronic circuits - Stable and reliable output voltage - Wide operating temperature range - Built-in protection features ensure safety

Disadvantages: - Fixed output voltage may not be suitable for all applications - Dropout voltage can cause a significant power loss in low input voltage scenarios

Working Principles

The L7809ABV is a linear voltage regulator that uses a series pass transistor to regulate the output voltage. It compares the reference voltage with the feedback voltage and adjusts the pass transistor accordingly to maintain a constant output voltage.

Detailed Application Field Plans

The L7809ABV is commonly used in various electronic devices and circuits, including:

1. Power Supplies: It is widely used as a voltage regulator in power supply circuits to provide a stable 9V output.
2. Audio Amplifiers: The L7809ABV can be used to regulate the voltage for audio amplifier circuits, ensuring consistent performance.
3. Microcontroller Systems: It is often employed in microcontroller-based systems to provide a regulated power source for reliable operation.

Detailed and Complete Alternative Models

• LM7809: Similar voltage regulator with the same specifications and pin configuration.
• MC7809: Another alternative with comparable characteristics and functionality.

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