The TL431CFK is a precision adjustable shunt regulator manufactured by NJR Corporation/NJRC. This three-terminal adjustable regulator offers excellent temperature stability and can be used as a replacement for zener diodes in many applications. Its output voltage can be set to any value between Vref (typically 2.5V) and 36V with two external resistors.

Applications

• Precision Voltage Reference
• Adjustable Power Supplies
• Switching Power Supplies
• Over Voltage Protection
• Current Limiter
• Battery Chargers
• Instrumentation

Features

• Programmable Output Voltage to 36V
• Low Dynamic Output Impedance: 0.2 Ω (Typical)
• Sink Current Capability: 1 mA to 100 mA
• Equivalent Full Range Temperature Coefficient Typically: 14 ppm/°C
• Temperature Compensated for Operation over Full Rated Operating Temperature Range
• Low Output Noise Voltage

Benefits

• Precision Voltage Regulation: Provides a stable and accurate voltage reference for various applications.
• Adjustable Output: Flexibility to set the desired output voltage using external resistors.
• Wide Operating Voltage Range: Operates over a wide voltage range, making it suitable for diverse applications.
• Temperature Stability: Maintains stable performance even under varying temperature conditions.
• Cost-Effective: Offers a cost-effective solution for voltage regulation needs.

Additional Details

The TL431CFK typically comes in a through-hole package. It requires external resistors to set the output voltage. The output voltage is calculated using the formula: Vout = Vref * (1 + R1/R2), where Vref is the internal reference voltage (approximately 2.5V), and R1 and R2 are the external resistors. It is crucial to select appropriate resistor values to achieve the desired output voltage and ensure stable operation.

The device's low dynamic output impedance ensures good load regulation, meaning the output voltage remains relatively constant even with changes in load current. It's important to consult the manufacturer's datasheet for detailed specifications, application circuits, and recommended operating conditions.