Adjustable precision shunt regulators for voltage control
Manufacturer： ti
# Introduction to the TL431MJGB Product Series
## 1. Overview
The TL431MJGB is a highly versatile and widely used precision adjustable shunt voltage reference in the electronics industry. It belongs to the TL431 family, which has gained a reputation for its excellent performance, reliability, and cost - effectiveness. This product series is designed to provide a stable and accurate reference voltage, making it an essential component in a variety of electronic circuits.
## 2. Key Features
### 2.1 Precision Voltage Reference
- The TL431MJGB offers a very precise output voltage. It can be adjusted within a wide range, typically from 2.5V to 36V. This adjustability allows designers to fine - tune the reference voltage according to the specific requirements of their circuits, ensuring high - precision operation in different applications.
- It has a low temperature coefficient, which means that the output voltage remains relatively stable over a wide temperature range. This is crucial in applications where environmental conditions may vary, as it helps to maintain the accuracy and reliability of the overall system.
### 2.2 High Output Current Capability
- It can sink a relatively large amount of current, up to 100mA. This high current - sinking ability makes it suitable for driving loads directly or for use in circuits where a significant amount of current needs to be regulated. For example, it can be used to drive optocouplers in power supply feedback loops, where the ability to handle a certain amount of current is essential for proper operation.
### 2.3 Low Dynamic Output Impedance
- The low dynamic output impedance of the TL431MJGB ensures that the output voltage remains stable even when the load current changes. This characteristic is important in applications where the load may vary, such as in power supplies with varying loads. It helps to minimize voltage fluctuations and provides a clean and stable reference voltage for other components in the circuit.
### 2.4 Wide Operating Temperature Range
- The product is designed to operate over a wide temperature range, typically from - 40°C to 125°C. This wide operating temperature range makes it suitable for use in various harsh environments, including automotive, industrial, and aerospace applications, where temperature variations can be significant.
## 3. Package and Pin Configuration
### 3.1 Package Type
The TL431MJGB is available in a TO - 92 package. The TO - 92 package is a widely used through - hole package that is easy to handle and mount on printed circuit boards (PCBs). It provides good mechanical stability and electrical insulation, making it suitable for both prototyping and mass production.
### 3.2 Pin Configuration
- **Anode (A)**: The anode pin is connected to the negative terminal of the power supply or the ground in most applications. It is the return path for the current flowing through the device.
- **Cathode (K)**: The cathode pin is the output terminal of the device. It is connected to the load or the circuit that requires the reference voltage. The current flowing through the cathode is regulated by the internal circuitry of the TL431MJGB.
- **Reference (R)**: The reference pin is used to set the output voltage. By connecting a voltage - dividing network to this pin, the user can adjust the output voltage of the device within the specified range.
## 4. Applications
### 4.1 Power Supplies
- In linear and switching power supplies, the TL431MJGB is commonly used as a voltage reference in the feedback loop. It helps to regulate the output voltage of the power supply by comparing the actual output voltage with the reference voltage. If the output voltage deviates from the desired value, the TL431MJGB adjusts the