L7920CV

Product Overview

Category: Integrated Circuit (IC)
Use: Voltage Regulator
Characteristics: Fixed Output, Negative Voltage Regulator
Package: TO-220
Essence: Linear Regulator
Packaging/Quantity: Tube/50 pieces

Specifications

Input Voltage: -35V to -10V
Output Voltage: -20V
Output Current: 1.5A
Dropout Voltage: 2V
Line Regulation: 0.04%
Load Regulation: 0.3%
Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The L7920CV IC has three pins:

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

Functional Features

Provides a fixed -20V output voltage.
Suitable for applications requiring a negative voltage supply.
Low dropout voltage ensures efficient regulation even with low input-output voltage differentials.
Internal thermal shutdown and current limiting protection features.
Wide operating temperature range allows for use in various environments.

Advantages

Simple and easy to use.
Reliable and stable voltage regulation.
Compact TO-220 package provides good heat dissipation.
Can be used in a wide range of applications.

Disadvantages

Limited output current capability compared to higher-rated regulators.
Requires external capacitors for stability.

Working Principles

The L7920CV is a linear voltage regulator that uses a negative feedback mechanism to maintain a constant -20V output voltage. It operates by comparing the output voltage with a reference voltage and adjusting the internal pass transistor to regulate the output voltage.

Detailed Application Field Plans

The L7920CV is commonly used in applications that require a negative voltage supply, such as:

Audio amplifiers
Industrial control systems
Test and measurement equipment
Automotive electronics
Telecommunications equipment

Detailed and Complete Alternative Models

LM7905: Negative voltage regulator with -5V output.
LT1963A: Adjustable negative voltage regulator.
MC79L15: Fixed -15V voltage regulator.

These alternative models provide similar functionality and can be used as substitutes for the L7920CV depending on specific requirements.

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Seznam 10 běžných otázek a odpovědí souvisejících s aplikací L7920CV v technických řešeních

Sure! Here are 10 common questions and answers related to the application of L7920CV in technical solutions:

Q: What is L7920CV? A: L7920CV is a voltage regulator IC (Integrated Circuit) that provides a fixed output voltage of -20V.
Q: What are the typical applications of L7920CV? A: L7920CV is commonly used in various technical solutions where a stable -20V power supply is required, such as audio amplifiers, industrial control systems, and instrumentation.
Q: What is the input voltage range for L7920CV? A: The input voltage range for L7920CV is typically between -35V and -7V.
Q: What is the maximum output current of L7920CV? A: The maximum output current of L7920CV is 1.5A.
Q: How does L7920CV regulate the output voltage? A: L7920CV uses internal circuitry to maintain a constant -20V output voltage, regardless of changes in the input voltage or load conditions.
Q: Can L7920CV handle higher input voltages? A: No, L7920CV is designed to operate within the specified input voltage range of -35V to -7V. Exceeding this range may damage the IC.
Q: Does L7920CV require any external components for operation? A: Yes, L7920CV requires a few external components like capacitors for stability and filtering purposes. Refer to the datasheet for recommended values.
Q: Is L7920CV available in different package types? A: Yes, L7920CV is available in different package types, such as TO-220 and D²PAK, to suit different application requirements.
Q: Can L7920CV be used in both AC and DC applications? A: Yes, L7920CV can be used in both AC and DC applications, as long as the input voltage falls within the specified range.
Q: Are there any precautions to consider when using L7920CV? A: Yes, some precautions include ensuring proper heat dissipation, avoiding reverse polarity connections, and adhering to the recommended operating conditions mentioned in the datasheet.

Please note that these answers are general and may vary depending on specific datasheet information and application requirements.