The TL431-AB3-R is a precision adjustable shunt regulator manufactured by UTC (Unisonic Technologies Co., Ltd.). This three-terminal programmable shunt regulator is commonly used in voltage regulation, voltage reference, and error amplifier applications. Its key feature is its ability to maintain a stable output voltage, making it suitable for diverse electronic circuits.

Applications:

• Adjustable power supplies.
• Voltage monitoring.
• Overvoltage protection circuits.
• Precision current sources.
• Error amplifiers in feedback control systems.

Features:

• Programmable output voltage.
• Low output noise.
• Low dynamic output impedance.
• High stability.
• Sink current capability of 100mA.
• Operating temperature range: -40°C to +85°C.

Benefits:

• Stable and accurate voltage regulation.
• Reduced output voltage ripple.
• Excellent load regulation.
• Reliable performance over a wide temperature range.
• Versatile for diverse circuit applications.

Additional Details:

The TL431-AB3-R can be programmed to regulate voltages from Vref (approximately 2.5V) to 36V, using two external resistors. The low output noise ensures a clean and stable voltage reference. The low dynamic output impedance provides excellent load regulation, minimizing output voltage variations with changing load currents. The sink current capability of 100mA allows the device to drive various loads. The TL431-AB3-R typically comes in a TO-92 or SOT-23 package. The output voltage is determined by the formula Vout = Vref * (1 + R1/R2), where R1 and R2 are the external programming resistors. The reference input current is typically very low, ensuring minimal loading on the feedback network.