SG117AIG-DESC

SG117AIG-DESC Voltage Regulator and Its Working Principle

SG117AIG-DESC is an integrated linear voltage regulator, belonging to a class of linear voltage regulators, which is a type of negative-voltage regulator IC (Integrated Circuit). This type of voltage regulator is produced by STMicroelectronics, a global semiconductor technology company.

The SG117AIG-DESC voltage regulator is a negative, low-dropout regulator (LDO) with an input voltage ranging from -25V to -1.3V and an output voltage that is adjustable from -2.7V to -25V. It also offers a guaranteed output current of 160mA and an excellent ripple rejection ratio of 72dB. In addition, the SG117AIG-DESC voltage regulator is designed to dissipate low power, making it suitable for low-power applications.

Application Fields

SG117AIG-DESC voltage regulator can be used in a variety of applications. It is widely used as an adjustable power supply for various electronic components and circuits, such as transistors and LEDs. In addition, it can also be used for adjusting the operating voltages of radio-frequency circuits and for providing a voltage reference for microcontroller systems. Furthermore, the SG117AIG-DESC voltage regulator can be applied in the field of audio, such as the power supply circuit of digital amplifiers, as well as all kinds of low-voltage regulator, digital TV and STM32 projects.

Working Principle

The SG117AIG-DESC voltage regulator works on the principle of “linear regulation”. This is an energy-efficient “buck-mode” topology, which relies on a continuous flow of energy, termed as “pulses” or “switching” between the input and output pins. A key feature of the SG117AIG-DESC voltage regulator is its low-dropout voltage, meaning that it can provide precise, low-voltage regulation with only a small difference between the input and output voltages.

To achieve such precise and low-voltage regulation, the SG117AIG-DESC voltage regulator relies on a sensing circuit, which is composed of a voltage feedback controller, a voltage reference chip and an error amplifier. The sensing circuit monitors and detects any differences between the output and the reference voltage. This detected difference is then fed to the error amplifier and the necessary correction is made to the output voltage.

The SG117AIG-DESC voltage regulator also uses a pulse-width modulation (PWM) technique to control the voltage. This technique is used to limit the output current and to reduce the power dissipation of the integrated circuit. In addition, the SG117AIG-DESC voltage regulator also offers a soft-start feature, which aids in reducing large inrush currents during startup and prevents damage to the circuit.

Conclusion

The SG117AIG-DESC voltage regulator is a type of integrated linear voltage regulator. It has wide applications in low-voltage circuits, such as radio-frequency and microcontroller systems. The working principle of this voltage regulator is based on linear regulation and pulse-width modulation techniques. This enables the voltage regulator to efficiently and accurately detect and regulate the output voltage, making it suitable for many applications.