TL431BQDBZRQ1

Noise - 0.1Hz to 10Hz:	--
Base Part Number:	TL431
Supplier Device Package:	SOT-23-3
Package / Case:	TO-236-3, SC-59, SOT-23-3
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TA)
Current - Cathode:	700µA
Current - Supply:	--
Voltage - Input:	--
Noise - 10Hz to 10kHz:	--
Series:	Automotive, AEC-Q100
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 TL431BQDBZRQ1 integrated circuit from Texas Instruments is a voltage reference device. It belongs to the class of power management devices known as Pulse Width Modulated (PWM) control circuits and it is predominantly used in precision applications. This device comprises of an 8-pin surface mount package and is used to provide an adjustable voltage reference by utilizing a regulated voltage divider. It incorporates an internal voltage reference, which is capable of providing long-term stability and accuracy of the output voltage. It offers a wide operating temperature range of -40°C to +125°C and a operating frequency of 1kHz. Additionally, it is capable of providing a dynamically adjustable output voltage from under and over-voltage applications with a low stability specification of 0.1%.

Application Field and Working Principle

TL431BQDBZRQ1 is widely used in power supplies, medical power supplies and other power-management applications such as automotive, consumer and industrial as a precision voltage reference. This device typically employs an adjustable voltage reference circuit to maintain a steady voltage output. It comprises of a feedback circuit and an adjustable precision reference voltage source. The resistance divider setup is the key component which helps in producing the reference voltage. When the reference voltage is applied to the resistor divider, the regulator maintains accuracy by creating a loop feedback and maintaining the output voltage within a determined range.In a typical TL431BQDBZRQ1 voltage reference application, the adjustable voltage reference source is configured toprovide a particular voltage range, while the feedback circuit is implemented to control the output voltage to the same reference range. The output voltage is divided between two resistors which creates the reference voltage. Furthermore, the output voltage from the system is monitored by the secondary sense amplifiers, which help in maintaining the reference voltage with the required stability.To further explain, the TL431BQDBZRQ1 contains an adjustable voltage divider which consists of three resistors and one transistor to form a very accurate reference voltage. The reference voltage is applied to a pair of resistors which construct the voltage divider. The reference voltage is generated from a zener diode or any other suitable voltage reference source. The voltage divider is then regulated by the transistor ensuring that the output voltage is within the predetermined range. There is also a buffer circuit to further improve the accuracy of the voltage reference.

Conclusion

The TL431BQDBZRQ1 integrated circuit provides an adjustable precision voltage reference which is predominantly used in precision applications such as power supplies, medical power supplies and other power-management applications. This device typically employs an adjustable voltage reference circuit to maintain a steady voltage output. It consists of a voltage divider setup which helps in producing the reference voltage and maintains the output voltage within a specific predetermined range. Additionally, there is a buffer circuit to further improve its accuracy.

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