The model " TL431 BQDBZR" is a voltage reference IC manufactured by Texas Instruments (TI). It is often used in applications requiring precise voltage regulation and feedback control systems, commonly found in power supplies, battery chargers, and other circuits that require stable voltage references.
Pin Function and Package Specification:
Package Type: The "TL431BQDBZR" is packaged in SOT-23-3, a small, surface-mount package. Pin Count: The SOT-23-3 package has 3 pins.Pinout Function Descriptions:
Pin Number Pin Name Pin Function Description Pin 1 Anode (A) The anode pin is the input pin. It connects to the negative side of the reference voltage source or the ground in the circuit. Pin 2 Cathode (K) The cathode pin is the output of the TL431. It connects to the load and the cathode of the internal reference diode. It provides the regulated output voltage. Pin 3 Ref (R) The reference pin is used to set the reference voltage and control the output voltage level. Typically, a resistor divider is connected between this pin and the cathode to set the voltage threshold.Detailed Pin Function Descriptions:
Anode (Pin 1): This pin is connected to the low voltage reference or ground in most applications. The voltage difference between the anode and cathode determines the operation of the device. The TL431 begins to regulate when the voltage at the anode exceeds approximately 2.495V (the reference voltage). Cathode (Pin 2): The cathode pin provides the output voltage, which is regulated by the internal feedback loop. It should be connected to the output of the circuit that needs stable regulation. The voltage at this pin depends on the reference voltage and the feedback provided by the resistor divider network connected to the reference pin. Reference (Pin 3): The reference pin is the control pin. A resistor network typically connects this pin to the cathode to create a feedback loop that determines the output voltage. The TL431 regulates the voltage at the cathode to maintain a constant value that is set by the feedback network involving this pin.FAQ for TL431BQDBZR (20 Common Questions):
Q: What is the voltage reference of the TL431BQDBZR? A: The TL431BQDBZR has a reference voltage of 2.495V, which is internally set for precise regulation.
Q: How do you use the TL431BQDBZR in a circuit? A: The TL431BQDBZR is typically used with a resistor divider connected between the cathode and the reference pin to set the output voltage.
Q: What type of package does the TL431BQDBZR come in? A: The TL431BQDBZR comes in a SOT-23-3 package, which is a surface-mount package with three pins.
Q: Can the TL431BQDBZR be used in power supply circuits? A: Yes, the TL431BQDBZR is commonly used in power supply circuits to provide a stable voltage reference for feedback control.
Q: What is the typical output voltage range for TL431BQDBZR? A: The output voltage is determined by the resistor divider between the cathode and reference pins. It typically ranges from 2.495V to higher values, depending on the design.
Q: What is the minimum anode-to-cathode voltage for TL431BQDBZR to operate? A: The minimum voltage difference between the anode and cathode for operation is typically 3V.
Q: Is the TL431BQDBZR a linear regulator? A: Yes, the TL431BQDBZR is a shunt voltage regulator, functioning in a linear mode to provide a stable output voltage.
Q: How can the output voltage of the TL431BQDBZR be adjusted? A: The output voltage is adjusted using a resistor network connected between the reference pin and cathode.
Q: Can the TL431BQDBZR be used in battery-powered circuits? A: Yes, it can be used in low-power, battery-powered circuits for stable voltage regulation.
Q: What is the maximum operating voltage for TL431BQDBZR? A: The maximum operating voltage between the anode and cathode is typically 36V.
Q: What is the output current capability of the TL431BQDBZR? A: The output current can range up to 100mA, depending on the specific circuit design and thermal considerations.
Q: Does the TL431BQDBZR have thermal shutdown protection? A: Yes, the TL431BQDBZR has internal thermal shutdown protection to prevent overheating.
Q: How does the TL431BQDBZR maintain voltage regulation? A: The TL431BQDBZR regulates the voltage by adjusting the output based on feedback from the reference pin, keeping the output voltage stable.
Q: Can the TL431BQDBZR be used in precision voltage reference applications? A: Yes, the TL431BQDBZR is used in precision voltage reference applications due to its stable 2.495V reference voltage.
Q: What is the quiescent current of the TL431BQDBZR? A: The quiescent current is typically around 1mA, making it suitable for low-power applications.
Q: Can the TL431BQDBZR be used in a feedback loop for voltage regulation? A: Yes, the TL431BQDBZR is designed to be used in feedback loops to regulate voltage in power supplies and other applications.
Q: What is the output voltage tolerance of the TL431BQDBZR? A: The TL431BQDBZR typically has a tolerance of ±1% for the reference voltage.
Q: How sensitive is the TL431BQDBZR to input voltage fluctuations? A: The TL431BQDBZR is relatively insensitive to small input voltage variations, thanks to its internal feedback mechanism.
Q: Can the TL431BQDBZR be used to generate a precise 5V output? A: Yes, with appropriate resistor values, the TL431BQDBZR can be used to generate a precise 5V output.
Q: How do you choose the feedback resistors for the TL431BQDBZR? A: The feedback resistors should be chosen based on the desired output voltage and the reference voltage, ensuring proper regulation.
This explanation covers the basic functionality of the TL431BQDBZR, its pins, and the FAQ for common uses. If you need more specific details, feel free to ask!
