L4931CD33

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Linear Voltage Regulators (LVRs) are used in various applications as they help maintain a constant voltage level by regulating the current flow. The L4931CD33 is a three-terminal adjustable voltage regulator which is specifically designed for low-voltage, low-power applications such as personal electronics and embedded systems.

Application Field of L4931CD33

The L4931CD33 from STMicroelectronics is a general-purpose adjustable voltage regulator with a very low quiescent current of 0.3mA, a maximum output voltage of 8V, and an output current of 500mA. It provides a wide range of input and output voltages for a broad range of applications. These include battery-operated systems, portable systems, automotive, industrial control, communications, and audio/video applications.

The L4931CD33 can be used to provide any user-defined output voltage between 1.2V and 7.5V with ±2% precision. It provides excellent line and load regulation with a wide bandwidth over temperature (typically 1MHz). The L4931CD33 is available in the TO-220 package and the TO-263 surface-mount package.

Working Principle of L4931CD33

The L4931CD33 is an integrated three-terminal adjustable voltage regulator. It consists of a voltage reference unit with a low-power divider, followed by a MOSFET with a grounded source. The output voltage is set by two external resistors combined with the integrated reference voltage.

In order to determine the output voltage, the two external resistors, R1 and R2 are adjusted to provide the required feedback voltage to the L4931CD33. The output voltage is determined by the balance between the output current and the external resistors. More precisely, the output voltage is determined by the equation Vout = Vref × (1 + R2/R1).

The advantage of this architecture is that it can maintain good line and load regulation over a wide range of temperature conditions. This makes it suitable for applications where a stable voltage is required. In addition, the L4931CD33 can handle sudden changes in the input voltage and provide a sharp edge response to the output voltage even for large load transients.

In addition, the device has a good thermal stability, which ensures that the device\'s output voltage will not be affected by variations in the ambient temperature. The L4931CD33 also provides excellent protection against short circuit and over-current conditions by using an internal current-limiting circuit.

The L4931CD33 is designed to operate with a wide range of input –output voltage ratios and is available in different packages with an operating temperature range of -40 degrees Celsius to +85 degrees Celsius. It is also designed to protect itself against reversed-polarity, thermal overload and over-voltage conditions.

Conclusion

The L4931CD33 is an integrated, low-power, three-terminal adjustable voltage regulator designed specifically for low-voltage, low-power applications. It is a general-purpose regulator that can be used in a variety of application fields. It provides excellent line and load regulation and good thermal stability. It also provides excellent protection against short circuit and over-current conditions. The device is available in a variety of packages with an operating temperature range of -40 degrees Celsius to +85 degrees Celsius and is suitable for use in battery-operated systems, portable systems, automotive, industrial control, communications and audio/video applications.

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