BA178M20T

Product Overview

Category: Integrated Circuit (IC)

Use: Voltage Regulator

Characteristics: - Fixed output voltage of 20V - Low dropout voltage - High accuracy and stability - Overcurrent protection - Thermal shutdown protection

Package: TO-220

Essence: The BA178M20T is a voltage regulator IC that provides a fixed output voltage of 20V. It is commonly used in electronic circuits to regulate and stabilize the voltage supply.

Packaging/Quantity: The BA178M20T is available in a TO-220 package, which is a widely used package type for power semiconductors. It is typically sold in reels or tubes containing multiple units.

Specifications

• Input Voltage Range: 24V - 35V
• Output Voltage: 20V ±2%
• Dropout Voltage: 1.5V (at 500mA)
• Maximum Output Current: 1A
• Line Regulation: 0.05% (typical)
• Load Regulation: 0.1% (typical)
• Operating Temperature Range: -40°C to +125°C

Pin Configuration

The BA178M20T has three pins:

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

Functional Features

• Fixed Output Voltage: The BA178M20T maintains a constant output voltage of 20V, regardless of variations in the input voltage or load conditions.
• Low Dropout Voltage: The regulator operates with a low dropout voltage, minimizing power dissipation and maximizing efficiency.
• Overcurrent Protection: The IC incorporates overcurrent protection, safeguarding the circuit from excessive current flow.
• Thermal Shutdown Protection: In case of excessive temperature, the regulator shuts down to prevent damage.

Advantages and Disadvantages

Advantages: - Stable and accurate output voltage - Low dropout voltage for efficient operation - Overcurrent and thermal protection enhance reliability - Easy to use and integrate into circuits

Disadvantages: - Limited maximum output current (1A) - Requires external capacitors for stability

Working Principles

The BA178M20T is a linear voltage regulator that uses a series pass transistor to regulate the output voltage. It compares the actual output voltage with a reference voltage and adjusts the pass transistor accordingly to maintain a constant output voltage.

Detailed Application Field Plans

The BA178M20T is widely used in various electronic applications requiring a stable 20V power supply. Some common application fields include:

1. Power Supply Units: Used in power supply units of electronic devices such as audio amplifiers, industrial equipment, and communication systems.
2. Automotive Electronics: Employed in automotive electronics for voltage regulation in systems like car audio, navigation, and lighting.
3. Instrumentation: Utilized in precision measurement instruments where a stable voltage reference is crucial.
4. Computer Systems: Integrated into computer motherboards and peripherals to provide regulated power to critical components.

Detailed and Complete Alternative Models

1. LM317: A popular adjustable voltage regulator IC that can be configured to provide a fixed 20V output.
2. LM340-20: Another fixed 20V voltage regulator IC available in different package options.
3. L78S20CV: A 20V fixed voltage regulator with higher maximum output current capability.

These alternative models offer similar functionality and can be considered as substitutes for the BA178M20T depending on specific requirements.

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