Voltage Regulators Circuit Diagrams

# Presettable Shunt Regulator Schematic Circuit Diagram

#### Exploring Linear Voltage Regulators: Series and Shunt Regulators

Presettable shunt regulator: Linear voltage regulators, integral to many electronic circuits, are traditionally categorized into two sub-groups based on their arrangement: series and shunt (or parallel) regulators. In real-world applications, series regulators, especially the widely used integrated types within the 78xx family, are the norm. They provide effective regulation and support reasonable output currents. However, noteworthy advancements in shunt regulators are emerging, exemplified by Texas Instruments’ “Irpe TIA31” series. The commercial variant, TIA31C, boasts exceptional temperature stability and remarkably low dynamic impedance (refer to the table for details).

While shunt regulators typically operate similarly to Zener diodes, the TI1431C introduces a unique feature absent in Zener diodes. It allows the setting of the Zener voltage within a range of 2.5V to 36V with the assistance of two fixed resistors. To function optimally, the device requires a cathode current of at least 1 mA. The voltage across the IC is then given by V = 2.5 * (1 + R2/R1). If R2 and R3 values aren’t excessively high, the current flowing through this reference network is negligible, measured in picoamperes (pA). The diagram showcases a practical application of the device’s compact 5V power supply.

#### SOME TECHNICAL DATA

• Cathode voltage: Ucat  2.5 V–36 V
• Cathode current: Icat  150 mA
• Power dissipation  (1 mA/min): 775 mW (at 25 °C)
• Dynamic impedance: 0.5 Ω (typically 0.2 Ω)
• Temperature coefficient: 30 ppm K-1

A regulator is a device that has the function of maintaining a designated characteristic. It performs the activity of managing or maintaining a range of values in a machine. The measurable property of a device is managed closely by specified conditions or an advance set value, or it can be a variable according to a predetermined arrangement scheme. It can be used generally to connote any set of various controls or devices for regulating or controlling items or objects.

#### Feature of TI1431C

• 0.4% Initial Voltage Tolerance
• 0.2-Ω Typical Output Impedance
• Fast Turnon (500 ns)
• Sink Current Capability (1 mA to 100 mA)
• Low Reference Current (REF)
• Adjustable Output Voltage (VI (ref) to 36 V)

#### Applications

• Adjustable Voltage and Current Referencing
• Secondary Side Regulation in Flyback SMPSs
• Zener Replacement
• Voltage Monitoring
• Comparator With Integrated Reference

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