NJM78L20UA

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Regulator
• Characteristics: Low Dropout, Positive Fixed Voltage Regulator
• Package: TO-92 (Through-Hole)
• Essence: The NJM78L20UA is a low dropout voltage regulator that provides a fixed positive output voltage of 20V.
• Packaging/Quantity: Available in reels or tubes, with varying quantities depending on the supplier.

Specifications

• Input Voltage Range: 7V to 35V
• Output Voltage: 20V
• Output Current: Up to 100mA
• Dropout Voltage: Typically 0.5V at 100mA load current
• Quiescent Current: Typically 4.5mA
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The NJM78L20UA has three pins:

1. Input (VIN): This pin is used to connect the input voltage, which should be within the specified range.
2. Ground (GND): This pin is connected to the ground reference.
3. Output (VOUT): This pin provides the regulated output voltage of 20V.

Functional Features

• Low dropout voltage: The NJM78L20UA has a low dropout voltage, allowing it to regulate the output voltage even when the input voltage is close to the desired output voltage.
• Overcurrent protection: The IC includes built-in overcurrent protection, safeguarding the circuit from excessive current flow.
• Thermal shutdown protection: In case of excessive temperature, the IC automatically shuts down to prevent damage.
• Short-circuit protection: The NJM78L20UA is designed to withstand short-circuits without causing any harm to the device.

Advantages and Disadvantages

Advantages: - Low dropout voltage ensures efficient regulation. - Built-in protection features enhance reliability. - Compact TO-92 package allows for easy integration into various circuits.

Disadvantages: - Limited output current capability (up to 100mA). - Requires external capacitors for stability.

Working Principles

The NJM78L20UA 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 stable output voltage of 20V.

Detailed Application Field Plans

The NJM78L20UA can be used in various applications, including but not limited to:

1. Power supply circuits: Provides a stable 20V output voltage for powering different components.
2. Audio amplifiers: Used as a regulated power source for audio amplification circuits.
3. Industrial control systems: Ensures a reliable and constant voltage supply for control systems.

Detailed and Complete Alternative Models

1. LM317: Adjustable voltage regulator with a wide input voltage range.
2. MC7805: Fixed 5V voltage regulator with higher output current capability.
3. LT1084: Adjustable voltage regulator with low dropout voltage and high output current.

These alternative models offer different features and specifications, allowing users to choose the most suitable option for their specific requirements.

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