NJM7915FA

Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Regulator
• Characteristics: Fixed Negative Voltage Regulator, -15V Output
• Package: TO-220
• Essence: Regulates input voltage to a fixed -15V output voltage
• Packaging/Quantity: Available in reels of 2,500 units

Specifications

• Input Voltage Range: -17V to -35V
• Output Voltage: -15V
• Output Current: Up to 1A
• Dropout Voltage: 2V (maximum)
• Line Regulation: 0.01%/V (typical)
• Load Regulation: 0.1% (typical)
• Operating Temperature Range: -40°C to +125°C

Pin Configuration

The NJM7915FA has a standard TO-220 package with three pins:

1. Pin 1: Input Voltage (VIN)
2. Pin 2: Ground (GND)
3. Pin 3: Output Voltage (VOUT)

Functional Features

• Fixed negative voltage regulation: The NJM7915FA provides a stable -15V output voltage regardless of changes in the input voltage or load conditions.
• Overcurrent protection: The IC includes built-in overcurrent protection to safeguard against excessive current flow.
• Thermal shutdown: In case of excessive temperature rise, the device automatically shuts down to prevent damage.

Advantages and Disadvantages

Advantages: - Simple to use: The NJM7915FA requires minimal external components for operation. - Reliable performance: It offers stable and accurate voltage regulation. - Cost-effective: The IC is available at an affordable price point.

Disadvantages: - Limited output current: The maximum output current is limited to 1A, which may not be sufficient for high-power applications. - Dropout voltage: The dropout voltage of 2V may result in higher power dissipation.

Working Principles

The NJM7915FA is a linear voltage regulator that utilizes a negative feedback mechanism to maintain a constant -15V output voltage. It consists of a series pass transistor, error amplifier, and voltage reference. The error amplifier continuously compares the output voltage with the reference voltage and adjusts the series pass transistor accordingly to regulate the output voltage.

Detailed Application Field Plans

The NJM7915FA is commonly used in various applications where a stable -15V voltage source is required. Some typical application fields include:

1. Power supplies: It can be used in power supply circuits to provide a regulated -15V voltage for analog or digital components.
2. Audio equipment: The IC finds application in audio amplifiers, mixers, and other audio devices that require a negative power supply.
3. Industrial control systems: It is suitable for industrial control systems that utilize negative voltage levels for specific functions.

Detailed and Complete Alternative Models

• LM7915: A popular alternative from Texas Instruments with similar specifications and pin configuration.
• MC7915: Another alternative from ON Semiconductor offering comparable performance characteristics.
• KA7915: An alternative from Fairchild Semiconductor with equivalent functionality and package type.

(Note: This list is not exhaustive and there are several other alternatives available in the market.)

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