L78M09CDT-TR

Product Overview

Category

L78M09CDT-TR belongs to the category of voltage regulators.

Use

It is primarily used to regulate and stabilize voltage in electronic circuits.

Characteristics

• Input Voltage Range: 11V to 35V
• Output Voltage: +9V
• Output Current: Up to 0.5A
• Dropout Voltage: 2V (typical)
• Operating Temperature Range: -40°C to +125°C
• Package Type: DPAK (TO-252)

Packaging/Quantity

L78M09CDT-TR is available in tape and reel packaging, with a quantity of 2500 units per reel.

Specifications

• Input Voltage Range: 11V to 35V
• Output Voltage: +9V
• Output Current: Up to 0.5A
• Dropout Voltage: 2V (typical)
• Line Regulation: ±0.2%
• Load Regulation: ±0.4%
• Quiescent Current: 6mA (typical)
• Ripple Rejection: 60dB (typical)
• Thermal Shutdown Protection: Yes
• Short Circuit Protection: Yes

Pin Configuration

The L78M09CDT-TR has three pins:

1. Input (VIN): This pin is connected to the input voltage source.
2. Ground (GND): This pin is connected to the ground reference.
3. Output (VOUT): This pin provides the regulated output voltage.

Functional Features

• Voltage Regulation: The L78M09CDT-TR ensures a stable output voltage of +9V, regardless of variations in the input voltage.
• Thermal Shutdown Protection: It incorporates a thermal shutdown mechanism that protects the device from overheating.
• Short Circuit Protection: The regulator is equipped with short circuit protection, preventing damage in case of a short circuit.

Advantages and Disadvantages

Advantages

• Wide input voltage range allows for flexibility in various applications.
• Compact DPAK package enables easy integration into electronic circuits.
• Excellent line and load regulation ensures stable output voltage under varying conditions.
• Thermal shutdown and short circuit protection enhance reliability and safety.

Disadvantages

• Limited output current capacity (up to 0.5A) may not be suitable for high-power applications.
• Dropout voltage of 2V may result in higher power dissipation compared to low dropout regulators.

Working Principles

The L78M09CDT-TR is a linear voltage regulator that utilizes a series pass transistor to regulate the output voltage. It operates by comparing the output voltage with a reference voltage and adjusting the pass transistor accordingly to maintain a constant output voltage of +9V. The regulator also incorporates feedback and control mechanisms to ensure stability and protect against thermal and short circuit conditions.

Detailed Application Field Plans

The L78M09CDT-TR finds application in various electronic systems where a regulated +9V voltage supply is required. Some common application fields include:

1. Power Supply Units: It can be used in power supply units to provide a stable +9V voltage rail for powering digital and analog circuits.
2. Audio Amplifiers: The regulator can be employed in audio amplifiers to generate a reliable +9V bias voltage for pre-amplification stages.
3. Industrial Control Systems: It is suitable for industrial control systems that require a regulated voltage source for powering sensors, actuators, and control circuitry.
4. Automotive Electronics: The regulator can be utilized in automotive electronics to deliver a consistent +9V voltage for various subsystems such as lighting, sensors, and communication modules.

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to the L78M09CDT-TR include:

1. LM7809: A widely used 3-terminal linear voltage regulator with a fixed +9V output voltage.
2. MC7809: Another popular 3-terminal regulator that provides a regulated +9V output voltage.
3. UA7809: A series of positive voltage regulators, including the UA7809C, offering a fixed +9V output voltage.

These alternative models can be considered based on specific requirements and availability in different markets.

In conclusion, the L78M09CDT-TR is a voltage regulator designed to provide a stable +9V output voltage in various electronic applications. Its compact package, wide input voltage range, and built-in protection features make it a reliable choice for powering circuits requiring a regulated voltage supply.