L4949ED

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Linear regulators are integral parts of any electronic products, providing a steady and precise power supply to the component and preventing it from the instabilities caused by the external power supply and voltage. L4949ED is a linear regulator from STMicroelectronics, a leading provider of integrated circuit technologies and solutions. This piece of article will explain the application field of L4949ED and its working principle so that you can better understand and use it.

Applications of L4949ED

The L4949ED is a linear regulator IC, with very precise output voltage, wide operating temperature range and low quiescent current consumption. It uses external components to provide a constant source of voltage and current supplied to the output pins. This IC can be used in various applications, such as in small electric machines, digital equipment, and other systems. It is widely used in electronics products such as air conditioners, cell phones, and printers.

The L4949ED is a low-dropout (LDO) regulator, meaning it has a low quiescent current that provides greater efficiency than linear regulators with a higher quiescent current. This is especially beneficial in low-power applications. It can provide an output current of up to 2A and an output voltage of up to 8V. It also features a 27kΩ pull-down resistance and a 0.8V (typical) output offset voltage for outstanding load regulation performance. In addition to its features, it has excellent thermal stability and high accuracy compared to other linear regulators.

Working Principle of L4949ED

The L4949ED works by regulating the output voltage according to the feedback given by the controlling circuitry. The controlling circuitry consists of an N-channel MOSFET, a Zener diode, and a current source. When the output voltage is higher than the reference level given by the Zener diode, the MOSFET will be turned off, limiting the amount of current applied to the output voltage. When the voltage drops below the reference level, the MOSFET will be turned on, allowing current to flow to the output.

The current source provides a constant source of current that is regulated by the Zener diode. The Zener diode acts as a reference voltage and sets the maximum level of the output voltage. As the Zener diode has a low voltage tolerance, it ensures that the output voltage of the regulator does not exceed its maximum value.

The L4949ED also features a wide operating temperature range and excellent thermal stability. It can operate between -40°C and 125°C and has a maximum thermal resistance of 75°C/W. This ensures that the L4949ED can be used in a variety of applications, from cold storage to industrial equipment.

In conclusion, the L4949ED is a linear regulator from STMicroelectronics. It has wide application fields, low dropout voltage, excellent thermal stability, and high accuracy. With its various features, the L4949ED can provide a reliable and efficient power supply for a variety of applications.

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