L78L18CD13TR

Product Overview

• Category: Voltage Regulator
• Use: To regulate and stabilize the output voltage in electronic circuits
• Characteristics:
  • Low dropout voltage
  • High output current capability
  • Thermal overload protection
  • Short-circuit protection
• Package: TO-252 (DPAK)
• Essence: Linear voltage regulator
• Packaging/Quantity: Tape and reel, 2,500 units per reel

Specifications

• Input Voltage Range: 7V to 20V
• Output Voltage: 18V
• Output Current: Up to 100mA
• Dropout Voltage: 1.7V (typical)
• Line Regulation: ±0.2% (typical)
• Load Regulation: ±0.4% (typical)
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The L78L18CD13TR has three pins:

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

Functional Features

• Voltage Regulation: The L78L18CD13TR regulates the output voltage to a constant 18V, regardless of changes in the input voltage or load conditions.
• Low Dropout Voltage: With a low dropout voltage of 1.7V, this regulator can maintain a stable output even when the input voltage is close to the desired output voltage.
• Thermal Overload Protection: The device includes built-in thermal overload protection, which shuts down the regulator if the temperature exceeds a safe operating limit.
• Short-Circuit Protection: In case of a short circuit on the output, the regulator limits the current to protect itself and the connected circuitry.

Advantages and Disadvantages

Advantages: - Provides a stable and regulated output voltage. - Suitable for low-power applications. - Offers thermal and short-circuit protection. - Easy to use and integrate into electronic circuits.

Disadvantages: - Limited output current capability (up to 100mA). - Requires an input voltage higher than the desired output voltage.

Working Principles

The L78L18CD13TR is a linear voltage regulator that uses a pass transistor to regulate the output voltage. It operates by comparing the output voltage with a reference voltage and adjusting the pass transistor accordingly. When the output voltage deviates from the desired value, the regulator adjusts the pass transistor to maintain a constant output voltage.

Detailed Application Field Plans

The L78L18CD13TR is commonly used in various electronic applications, including:

1. Power Supplies: It can be used as a voltage regulator in power supply circuits to provide a stable output voltage for other components.
2. Battery-Powered Devices: The regulator ensures a constant voltage supply to sensitive components in battery-powered devices, such as portable audio players and handheld instruments.
3. Automotive Electronics: It finds application in automotive electronics, providing regulated voltage to sensors, actuators, and other critical components.
4. Industrial Control Systems: The regulator is suitable for industrial control systems, where precise and stable voltage regulation is required for reliable operation.

Detailed and Complete Alternative Models

Some alternative models to the L78L18CD13TR include:

1. LM7805: A popular 5V linear voltage regulator with similar characteristics but a different output voltage.
2. LT1084: A high-current linear voltage regulator capable of delivering up to 5A of output current.
3. ADP3339: A low-dropout linear voltage regulator with adjustable output voltage and high output current capability.

These alternative models offer different output voltages, current capabilities, and additional features to suit various application requirements.

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