The part number "MC 78L05 ACDR2G" corresponds to an integrated voltage regulator IC manufactured by ON Semiconductor. It is a linear voltage regulator in the 3-pin TO-220 package, providing a regulated 5V output.
Pinout and Function Specifications:
The MC78L05ACDR2G is a 3-pin voltage regulator in the TO-220 package. The pinout for the MC78L05ACDR2G is as follows:
Pin 1 - Input (Vin): This is the input pin for the voltage regulator. The input voltage must be greater than the output voltage by at least 2V (typically 7V to 35V) for the regulator to function correctly.
Pin 2 - Ground (GND): This pin is connected to the ground of the system. It serves as the reference point for the output voltage.
Pin 3 - Output (Vout): This pin provides the regulated output voltage, which is typically 5V in the case of the MC78L05ACDR2G. The output voltage is constant regardless of fluctuations in the input voltage (within the specified range).
Circuit Principles:
The MC78L05ACDR2G works on the principle of linear voltage regulation. A higher input voltage is converted into a lower, stable output voltage (5V), with the excess energy dissipated as heat.
The key aspects of its operation include:
The input voltage is supplied to Pin 1. The voltage regulator uses internal circuitry to reduce the input voltage to a stable 5V. The regulated voltage is available at Pin 3. The ground pin (Pin 2) provides the reference point for the output voltage.Full Pin Function List:
Pin Number Pin Name Pin Function Description 1 Input (Vin) Provides the input voltage (typically between 7V and 35V) for the regulator to convert. 2 Ground (GND) Connects to the ground of the system, providing a reference point for the output voltage. 3 Output (Vout) Outputs the regulated 5V voltage to the load.FAQ (Frequently Asked Questions):
Here are 20 common questions and answers related to the MC78L05ACDR2G:
Q: What is the input voltage range for the MC78L05ACDR2G? A: The input voltage range is between 7V and 35V. Q: What output voltage does the MC78L05ACDR2G provide? A: The MC78L05ACDR2G provides a regulated 5V output voltage. Q: Can I use the MC78L05ACDR2G with a lower input voltage? A: No, the input voltage must be at least 7V for proper operation. Q: How much output current can the MC78L05ACDR2G supply? A: The MC78L05ACDR2G can supply a maximum output current of 1A. Q: What is the maximum Power dissipation for the MC78L05ACDR2G? A: The maximum power dissipation is calculated based on the voltage difference between the input and output, multiplied by the output current. Q: Can I use the MC78L05ACDR2G without a heatsink? A: A heatsink is recommended if the regulator is dissipating significant power due to high input voltage or high output current. Q: What type of capacitor should I use on the output of the MC78L05ACDR2G? A: A 0.33µF capacitor is typically recommended on the output for stability. Q: What is the MC78L05ACDR2G's thermal shutdown feature? A: The MC78L05ACDR2G includes thermal shutdown protection to prevent damage due to overheating. Q: Can I use the MC78L05ACDR2G for regulating voltages other than 5V? A: No, the MC78L05ACDR2G is a 5V linear regulator. For other voltages, a different part number would be needed.Q: How do I calculate the power dissipation in the MC78L05ACDR2G?
A: Power dissipation is calculated as (Vin - Vout) x Iout, where Vin is the input voltage, Vout is the output voltage (5V), and Iout is the output current.Q: What are the typical applications for the MC78L05ACDR2G?
A: It is commonly used in powering low-power electronics, such as microcontrollers, sensors, and logic circuits.Q: What is the maximum dropout voltage for the MC78L05ACDR2G?
A: The typical dropout voltage is 2V, meaning the input voltage must be at least 7V for proper operation.Q: Does the MC78L05ACDR2G have short-circuit protection?
A: Yes, the MC78L05ACDR2G includes short-circuit protection to prevent damage under fault conditions.Q: Can I use the MC78L05ACDR2G for both positive and negative voltages?
A: No, the MC78L05ACDR2G is designed for positive voltage regulation only.Q: What is the input current for the MC78L05ACDR2G?
A: The input current is dependent on the load current, and the efficiency of a linear regulator is generally lower than switching regulators.Q: How does the MC78L05ACDR2G compare to other 5V regulators?
A: The MC78L05ACDR2G is a simple linear regulator, suitable for low-current applications, and has less efficiency than switching regulators.Q: What is the maximum output voltage tolerance of the MC78L05ACDR2G?
A: The output voltage tolerance is typically ±2% at 25°C.Q: Is the MC78L05ACDR2G suitable for automotive applications?
A: Yes, as long as the input voltage range is within specification, the MC78L05ACDR2G can be used in automotive circuits.Q: Can the MC78L05ACDR2G be used in battery-powered devices?
A: Yes, but note that battery life may be affected due to inefficiency in power conversion.Q: What are the package details for the MC78L05ACDR2G?
A: The MC78L05ACDR2G comes in the TO-220 package, which has three pins and is commonly used for through-hole mounting.Let me know if you need more details or further clarification on any specific aspect!
