TL431BCLPR

Noise - 0.1Hz to 10Hz:	--
Base Part Number:	TL431B
Supplier Device Package:	TO-92-3
Package / Case:	TO-226-3, TO-92-3 (TO-226AA) (Formed Leads)
Mounting Type:	Through Hole
Operating Temperature:	0°C ~ 70°C (TA)
Current - Cathode:	600µA
Current - Supply:	--
Voltage - Input:	--
Noise - 10Hz to 10kHz:	--
Series:	--
Temperature Coefficient:	--
Tolerance:	±0.5%
Current - Output:	100mA
Voltage - Output (Max):	36V
Voltage - Output (Min/Fixed):	2.495V
Output Type:	Adjustable
Reference Type:	Shunt
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The TL431BCLPR is an integrated three-terminal voltage reference that features a low current-sink capability, superior line and load regulation characteristics, minimal temperature drift, and a wide operating current range. It is designed to operate with supply voltages from 3 V to 35 V, and has an output voltage range of −1.2 to +38 V. It can be used to monitor, regulate, and provide reference voltages for precision power supplies, voltage regulators, and similar applications. It also has a wide range of application fields and principles of operation.

Application Field

The TL431BCLPR has a number of application fields, ranging from IGBT and LED drivers, PFC (Power Factor Control) circuits for switching power supplies, discharge circuit for Li-ion battery protection, and over-voltage protection circuits. 1. IGBT and LED Drivers: The TL431BCLPR can be used to regulate the supply voltage in IGBT and LED drivers, where its superior line and load regulation capabilities help to provide a constant output voltage and current to the load. 2. PFC Circuits for Switching Power Supplies: The TL431BCLPR can be used in power factor correction circuits for switching power supplies, helping to minimize harmonic distortion and reduce input power losses. 3. Discharge Circuit for Li-ion Battery Protection: The TL431BCLPR can be used in discharge circuits for Li-ion battery packs, to maintain a constant discharge voltage and protect the battery from over-discharge.4. Over-Voltage Protection Circuits: The TL431BCLPR can be used in over-voltage protection circuits, to protect sensitive electronic components from damage due to over-voltage conditions.

Working Principles

The TL431BCLPR is essentially a high-precision low-power voltage regulator. It consists of a three-terminal device, with two resistors, an “Adjust” pin, and a “Reference” pin. The two resistors, one connected between the “Reference” pin and “V2” (Supply Voltage), and the other connected between “V1” (Inverting Output Voltage) and the “Adjust” pin, determine the output voltage of the device. By adjusting the value of the resistors, the output voltage can be adjusted from –1.2V up to approximately 38.5V. The output voltage is regulated by an internal, temperature-compensated Zener diode, which samples the output voltage and compares it against an internal reference voltage. The current sink is provided by an external resistor connected to the “Reference” pin. The internal current sink is then adjusted in order to maintain a constant output voltage. The device can be operated in two modes, “Open-loop” and “Closed-loop”, depending on the values of the external resistors and the current sink. In “Open-loop” mode, the output voltage is determined by the values of the external resistors and the temperature-compensated Zener diode. This mode is usually used when precise control of the output voltage is not required. In “Closed-loop” mode, the output voltage is regulated by an internal current sink. This mode is usually used when precise control of the output voltage is essential.

Conclusion

The TL431BCLPR is an integrated three-terminal voltage regulator, with a low current-sink capability, superior line and load regulation characteristics, and a wide output voltage range. It has several application fields, ranging from IGBT and LED drivers, PFC (Power Factor Control) circuits for switching power supplies, discharge circuit for Li-ion battery protection, and over-voltage protection circuits. It can be operated in either “Open-loop” or “Closed-loop” mode, depending on the values of the external resistors and the current sink. With its wide range of application fields and principles of operation, the TL431BCLPR is an ideal choice for precision power supplies, voltage regulators, and other similar applications.

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