NJM79L15A

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Regulator
• Characteristics: Low dropout voltage, high ripple rejection, compact size
• Package: TO-92 (3-pin package)
• Essence: Linear voltage regulator
• Packaging/Quantity: Available in reels of 2,500 units

Specifications

• Input Voltage Range: -35V to -18V
• Output Voltage: -15V
• Output Current: 100mA
• Dropout Voltage: 1.5V (typical)
• Ripple Rejection Ratio: 60dB (typical)
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The NJM79L15A IC has three pins:

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

Functional Features

• Voltage Regulation: The NJM79L15A maintains a stable output voltage of -15V regardless of changes in the input voltage or load conditions.
• Low Dropout Voltage: With a typical dropout voltage of 1.5V, the IC can regulate the output voltage even when the input voltage is close to the desired output voltage.
• High Ripple Rejection: The IC exhibits excellent rejection of input ripple voltage, ensuring a clean and stable output voltage.
• Thermal Shutdown Protection: The device incorporates thermal shutdown circuitry to prevent damage due to excessive temperature.

Advantages and Disadvantages

Advantages: - Compact Size: The TO-92 package makes it suitable for space-constrained applications. - Easy to Use: The three-pin configuration simplifies the circuit design and integration process. - Low Dropout Voltage: Enables efficient voltage regulation even with low input-output differentials.

Disadvantages: - Limited Output Current: The NJM79L15A can provide a maximum output current of 100mA, which may not be sufficient for high-power applications. - Negative Voltage Output: The IC only provides negative voltage regulation, limiting its use in certain applications requiring positive voltage regulation.

Working Principles

The NJM79L15A is a linear voltage regulator that utilizes a series pass transistor to regulate the output voltage. It compares the reference voltage (-15V) with the feedback voltage and adjusts the pass transistor accordingly to maintain a stable output voltage.

Detailed Application Field Plans

The NJM79L15A finds applications in various fields, including:

1. Industrial Electronics: Used in power supply circuits for industrial equipment and machinery.
2. Automotive Electronics: Employed in automotive systems such as audio amplifiers and lighting controls.
3. Telecommunications: Utilized in communication devices and network infrastructure equipment.
4. Consumer Electronics: Integrated into audio/video equipment, gaming consoles, and portable devices.

Detailed and Complete Alternative Models

1. LM79L15: Manufactured by Texas Instruments, this IC offers similar specifications and pin configuration to the NJM79L15A.
2. MC79L15: Produced by ON Semiconductor, it is another alternative with comparable characteristics and package type.
3. UA79L15: Manufactured by Fairchild Semiconductor, this IC provides an alternative option for -15V voltage regulation.

(Note: This list is not exhaustive and other alternatives from different manufacturers may exist.)

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