LM7908CT

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Regulator
• Characteristics: Negative voltage regulator, fixed output voltage of -8V
• Package: TO-220
• Essence: Regulates input voltage to a stable -8V output voltage
• Packaging/Quantity: Available in packs of 10 or individually

Specifications

• Input Voltage Range: -10V to -35V
• Output Voltage: -8V
• Output Current: Up to 1.5A
• Dropout Voltage: 2V (maximum)
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The LM7908CT has three pins:

1. Pin 1 (Input): Connects to the input voltage source (-10V to -35V).
2. Pin 2 (Ground): Connected to the ground reference.
3. Pin 3 (Output): Provides the regulated -8V output voltage.

Functional Features

• Regulates the input voltage to a stable -8V output voltage.
• Provides protection against overcurrent and thermal overload.
• Low dropout voltage ensures efficient regulation even with low input-output voltage differentials.
• Internal short-circuit current limiting protects the device from excessive current flow.

Advantages and Disadvantages

Advantages: - Simple and reliable voltage regulation solution. - Wide input voltage range allows for versatile applications. - Compact TO-220 package facilitates easy integration into various circuits.

Disadvantages: - Fixed output voltage limits flexibility in certain applications. - Dropout voltage may cause power dissipation in high-current scenarios.

Working Principles

The LM7908CT is a negative voltage regulator that utilizes a series pass transistor to regulate the output voltage. It compares the reference voltage (-8V) with the feedback voltage from the output, adjusting the series pass transistor to maintain a stable -8V output.

Detailed Application Field Plans

The LM7908CT finds applications in various fields, including: 1. Power supply circuits requiring a regulated -8V output. 2. Audio amplifiers and preamplifiers. 3. Industrial control systems. 4. Automotive electronics. 5. Instrumentation and measurement equipment.

Detailed and Complete Alternative Models

• LM79XX series: Provides negative voltage regulation with different fixed output voltages (e.g., LM7912 for -12V).
• LM317: Adjustable positive voltage regulator.
• LM337: Adjustable negative voltage regulator.

These alternative models offer different output voltage options or adjustable voltage regulation, providing flexibility for specific application requirements.

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