TLV431ALP

Noise - 0.1Hz to 10Hz:	--
Base Part Number:	TLV431
Supplier Device Package:	TO-92-3
Package / Case:	TO-226-3, TO-92-3 (TO-226AA)
Mounting Type:	Through Hole
Operating Temperature:	-40°C ~ 85°C (TA)
Current - Cathode:	80µA
Current - Supply:	--
Voltage - Input:	--
Noise - 10Hz to 10kHz:	--
Series:	--
Temperature Coefficient:	--
Tolerance:	±1%
Current - Output:	20mA
Voltage - Output (Max):	16V
Voltage - Output (Min/Fixed):	1.24V
Output Type:	Adjustable
Reference Type:	Shunt
Part Status:	Obsolete
Packaging:	Bulk

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<p>The TLV431ALP is a three-terminal adjustable shunt regulator used as a reference in an integrated circuit (IC) to provide a control voltage for monitoring overvoltage, undervoltage, or temperature. It enables the use of an external resistor for setting the voltage level. It has a combined high accuracy and wide range of operating voltages. This article explains the TLV431ALP application field, working principles, and structure.</p><p><strong>Application Field</strong></p><p>The TLV431ALP is typically used as a voltage reference in a wide range of applications, particularly those requiring precise measurements or control voltages. It is often used in memory protection circuits, analog-to-digital circuits, and programmable logic controllers. It can also be used in battery-operated devices, such as cellular phones, digital cameras, and computers. In addition, its low operating current makes it an ideal component for low-power applications.</p><p><strong>Working Principle</strong></p><p>The TLV431ALP works as a shunt regulator, which means that it adjusts the current from its output terminal to the control terminal in order to maintain the voltage at the control terminal at a predetermined value. This voltage is established with a single external resistor, R SET , which is connected to the device\'s control terminal. When the voltage at the control terminal increases, the device reduces the amount of current flowing through the output to the control terminal, thereby maintaining the set voltage. On the other hand, when the voltage at the control terminal decreases, the device increases the current through the output in order to maintain the preset voltage.</p><p><strong>Structure</strong></p><p>The TLV431ALP consists of a voltage monitoring circuit, an operational amplifier (op amp), a pair of transistor-like devices, and an internal bandgap voltage reference. The monitoring circuit is composed of the internal bandgap voltage reference and the temperature-compensated voltage of the operating amplifier. The voltage monitoring circuit senses the external voltage at the control terminal and amplifies it. This amplified set voltage is then compared to the internal bandgap voltage reference and the temperature-compensated voltage of the operating amplifier. If the voltage difference between the two is larger than a predetermined value, a differential amplifier amplifies it and provides it to the small signal transistors.</p><p>The small signal transistors then act as current sources to control the current out of the output terminal. If the control terminal voltage is higher than the preset voltage, the current sources are activated and the current flowing to the control terminal is reduced. The opposite is true if the control terminal voltage is lower than the preset voltage; the current sources are not activated and the current flowing to the control terminal is increased.</p><p>In summary, the TLV431ALP is an adjustable, three-terminal shunt regulator device that provides a precise, temperature-compensated voltage reference. It is used as a reference in a wide range of applications, mainly those requiring precise measurements or control voltages. This device has a combined high accuracy and wide range of operating voltages, making it an excellent choice for low-power applications.</p>

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