The TL431BIDBZR is a shunt regulator diode made by Texas Instruments. It is commonly used in power supply circuits to regulate the voltage across various components. Below is the detailed breakdown of the requested information, including the pin functions, package details, and FAQs in the requested format.
1. Package Type:
The TL431BIDBZR is housed in a TO-92 package (a 3-lead plastic package).
2. Pin Function Table (3 pins):
Pin Number Pin Name Pin Function Description 1 Anode This pin is connected to the negative supply voltage (ground) and is the reference point for voltage regulation. It is the input pin where the voltage is sensed for regulation. 2 Cathode The Cathode pin connects to the load circuit and is where the regulated voltage is output. This is the controlled output voltage pin. 3 Ref The Reference pin is used for setting the reference voltage to the TL431B. A resistor network is typically connected to this pin to set the desired output voltage. This is also the pin used to monitor feedback voltage.3. Circuit Principle Explanation:
The TL431 is an adjustable shunt regulator used for precise voltage control in power supplies. It is typically used to stabilize or control the output voltage in switching power supplies, voltage regulators, and other analog circuits. When a voltage is applied to the Anode pin, the Cathode pin will regulate the voltage such that it maintains a constant reference voltage, typically around 2.495V. The Ref pin is where feedback from the output circuit is applied to control the shunt regulator’s response, allowing for an adjustable output voltage. The device maintains a constant output by adjusting the voltage across the load depending on the voltage applied at the Anode and the feedback received at the Ref pin.4. FAQ on TL431BIDBZR (20 Common Questions)
Q1: What is the function of the Anode pin on the TL431BIDBZR?A1: The Anode pin of the TL431BIDBZR connects to the ground or negative side of the circuit, and it is the voltage sensing pin for regulation.
Q2: What is the purpose of the Cathode pin on the TL431BIDBZR?A2: The Cathode pin is the regulated output pin, providing the controlled voltage to the load in the circuit.
Q3: What is the function of the Ref pin on the TL431BIDBZR?A3: The Ref pin is used to set the reference voltage for feedback control and voltage regulation in the circuit.
Q4: What type of device is the TL431BIDBZR?A4: The TL431BIDBZR is a shunt voltage regulator or adjustable regulator diode.
Q5: What is the output voltage of the TL431BIDBZR?A5: The TL431BIDBZR maintains a regulated output voltage of approximately 2.495V when the reference pin is properly biased.
Q6: How do you adjust the output voltage on the TL431BIDBZR?A6: You can adjust the output voltage by using a resistor network connected to the Ref pin to modify the reference voltage.
Q7: What is the maximum voltage that can be applied to the Anode pin?A7: The maximum voltage on the Anode pin should not exceed 37V as per the specifications for the TL431BIDBZR.
Q8: Can the TL431BIDBZR be used in a power supply?A8: Yes, the TL431BIDBZR is commonly used in power supplies, especially in voltage regulation circuits.
Q9: What is the current regulation capability of the TL431BIDBZR?A9: The TL431BIDBZR can regulate currents up to 100mA, making it suitable for various power applications.
Q10: How is the TL431BIDBZR different from other voltage regulators?A10: The TL431BIDBZR is an adjustable shunt regulator, while most other voltage regulators are linear or switching regulators with fixed output voltages.
Q11: Can I use the TL431BIDBZR for precise voltage regulation in sensitive applications?A11: Yes, the TL431BIDBZR provides precise voltage regulation, with a typical reference voltage of 2.495V and low tolerance, making it suitable for sensitive applications.
Q12: What is the typical application circuit for the TL431BIDBZR?A12: A typical application involves using the TL431BIDBZR in voltage feedback circuits, such as in the regulation of power supply outputs or as a reference voltage source.
Q13: What is the power dissipation of the TL431BIDBZR?A13: The TL431BIDBZR has a maximum power dissipation rating of 500mW, depending on the circuit configuration.
Q14: Can I use the TL431BIDBZR in a feedback loop?A14: Yes, the TL431BIDBZR is designed to work in feedback loops for regulating voltage in applications like switching regulators or precision voltage dividers.
Q15: What is the response time of the TL431BIDBZR in a typical application?A15: The response time is typically 50µs for the TL431BIDBZR, making it suitable for fast voltage regulation in switching power supplies.
Q16: Is the TL431BIDBZR temperature-sensitive?A16: Yes, the TL431BIDBZR has a temperature coefficient for the reference voltage, but it is generally stable over a wide temperature range, typically from -40°C to +125°C.
Q17: What is the input voltage range for the TL431BIDBZR?A17: The TL431BIDBZR operates with an input voltage in the range of 2.495V to 37V (depending on the configuration).
Q18: Can I use the TL431BIDBZR in a current-sensing application?A18: While the TL431BIDBZR is a voltage regulator, it is not typically used directly for current sensing applications.
Q19: How do I connect the Ref pin to a feedback loop?A19: The Ref pin should be connected to the voltage divider network, which sets the output voltage by controlling the reference feedback voltage.
Q20: How does the TL431BIDBZR protect against overvoltage?A20: The TL431BIDBZR does not inherently have overvoltage protection, so external components (e.g., zener diodes) are typically used for overvoltage protection in the application circuit.
This summary provides all necessary details about the TL431BIDBZR device, including pin functions, circuit principles, and answers to common questions.
