NCV1117ST50T3G Detailed explanation of pin function specifications and circuit principle instructions

The part number NCV1117ST50T3G belongs to ON Semiconductor (ON Semiconductor is a well-known manufacturer of semiconductor components). The NCV1117ST50T3G is a low-dropout voltage regulator (LDO), and based on the part number, the "ST" suffix indicates that the package is in a TO-220 form. The "50" refers to the output voltage of 5.0V, and the "T3G" is often related to packaging and other component markings.

Here’s a detailed breakdown of the component, its pinout, and other relevant technical specifications for the NCV1117ST50T3G.

Pin Function Specification and Circuit Principle:

The NCV1117ST50T3G is a 3-terminal low-dropout regulator (LDO). Below are the pinout and descriptions:

Pin Configuration:

Pin 1 (Adjust/Reference):

Function: This pin is the adjustment pin for the output voltage (for adjustable versions). In the fixed 5V version, this pin is typically left open or connected to a reference voltage.

Application: Used for adjusting the output voltage if the version isn't a fixed one.

Pin 2 (Ground):

Function: This pin is connected to the ground of the system and is typically tied to the system's ground.

Application: Provides the common return path for the regulator and the load.

Pin 3 (Output):

Function: This is the regulated output voltage pin. For the NCV1117ST50T3G, this pin outputs a fixed 5V.

Application: Provides the stable output voltage (5V in this case) to power other components or subsystems.

Package: TO-220 (3 Pins)

The TO-220 package for this LDO voltage regulator consists of 3 pins arranged in a linear fashion. It is a commonly used package for power semiconductors. The package is designed to provide sufficient heat dissipation when the component is in use, typically requiring a heatsink if the device is dissipating significant power.

Detailed Pinout Table:

Pin Number Pin Name Description Function & Usage 1 Adjust Adjustment pin for output voltage. Used to set output voltage if the device is adjustable. If fixed, leave this pin open. 2 Ground Ground pin, connects to the system ground. Common reference point for the regulator and system. 3 Output Regulated output voltage. Provides a fixed output of 5V in the NCV1117ST50T3G model.

Circuit Principle:

The NCV1117ST50T3G uses a feedback loop to regulate the output voltage. The input voltage must be higher than the output voltage by at least the dropout voltage, which is typically around 1.1V for this regulator at a current load of 800mA.

When the input voltage is applied to the Input pin, it is processed through internal transistor s to provide a regulated output at the Output pin. The Ground pin is the reference for the regulator. The adjustment pin is used for fine-tuning the output voltage in adjustable versions of the regulator.

FAQ (Frequently Asked Questions):

Q: What is the output voltage of the NCV1117ST50T3G? A: The output voltage is fixed at 5.0V for the NCV1117ST50T3G. Q: What is the maximum output current for the NCV1117ST50T3G? A: The NCV1117ST50T3G can supply up to 800mA of output current. Q: What is the dropout voltage of the NCV1117ST50T3G? A: The typical dropout voltage is around 1.1V at a 800mA load. Q: What type of package does the NCV1117ST50T3G come in? A: The NCV1117ST50T3G comes in a TO-220 package. Q: Can the NCV1117ST50T3G be used for adjustable output voltage? A: Yes, the NCV1117ST50T3G can be used for adjustable output voltage, depending on the version. For the fixed 5V version, the adjustment pin is not used. Q: How can the output voltage be adjusted on the NCV1117ST50T3G? A: If you have an adjustable version, the output voltage can be set by connecting a resistor divider between the output pin and the adjustment pin. Q: What is the thermal resistance for the TO-220 package? A: The thermal resistance is typically around 50°C/W in the TO-220 package, but it can vary depending on heat sinking. Q: How should the NCV1117ST50T3G be mounted on a PCB? A: The NCV1117ST50T3G should be mounted with proper heat dissipation considerations. Ensure that the ground pin is properly connected to the system ground. Q: What is the recommended input voltage for the NCV1117ST50T3G? A: The input voltage should be at least 6V to account for the dropout voltage.

Q: Is the NCV1117ST50T3G capable of regulating negative voltages?

A: No, the NCV1117ST50T3G is a positive voltage regulator and cannot regulate negative voltages.

Q: Can the NCV1117ST50T3G work with low capacitive loads?

A: Yes, the NCV1117ST50T3G can work with low capacitive loads, typically requiring a minimum of 10µF on the output for stability.

Q: What type of capacitor s should be used with the NCV1117ST50T3G?

A: It is recommended to use ceramic or tantalum capacitors for stable performance, with a typical value of 10µF on the output.

Q: What is the quiescent current of the NCV1117ST50T3G?

A: The quiescent current of the NCV1117ST50T3G is typically around 5mA.

Q: Can the NCV1117ST50T3G be used in battery-powered applications?

A: Yes, the low dropout voltage makes the NCV1117ST50T3G suitable for battery-powered applications.

Q: Is the NCV1117ST50T3G a fixed or adjustable regulator?

A: The NCV1117ST50T3G is a fixed 5V output regulator.

Q: What is the maximum power dissipation of the NCV1117ST50T3G?

A: The maximum power dissipation depends on the input-to-output voltage difference and the output current. It can be calculated as (P = (V{in} - V{out}) \times I_{load}).

Q: Does the NCV1117ST50T3G have overcurrent protection?

A: Yes, the NCV1117ST50T3G includes thermal shutdown and current limiting to protect against overcurrent situations.

Q: How can I connect the NCV1117ST50T3G in my circuit?

A: Connect the input pin to your source voltage, the output pin to the load, and the ground pin to your system's ground.

Q: What is the typical response time of the NCV1117ST50T3G?

A: The typical response time is fast, but it is also dependent on the output capacitor used in the circuit.

Q: Can I use the NCV1117ST50T3G in high-temperature environments?

A: The NCV1117ST50T3G can operate in high-temperature environments, but it is important to consider thermal management and derating to prevent overheating.

This detailed explanation covers the pinout, circuit principle, and various FAQs for the NCV1117ST50T3G low-dropout regulator. Let me know if you need any further details!