AN79L20

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AN79L20 is a three-terminal adjustable regulator designed for use in a wide range of applications with input from 3V to 40V. It has a wide output voltage range of 1V to 40V, high output current and an adjustable current limit. As a linear voltage regulator, it works in a voltage regulator circuit and features excellent load regulation, line regulation, and transient response.

AN79L20 is suitable for many types of applications such as low-noise high-efficiency power supplies, instrumentation, industrial control, precision reference, audio, telecom and lighting. In addition, it is available in both large and small package sizes, making it suitable for space-constrained designs.

The major components of the AN79L20 regulator are the pass transistor, the error amplifier, the band-gap reference and the control logic. The pass transistor is an N-channel MOSFET whose drain is connected to the output, source to the ground and the gate to the negative side of the output voltage. The pass transistor is the main component of the regulator and is designed to adjust the output voltage through its gate to ground voltage.

The reference voltage is provided by an external reference is generated by a bandgap circuit integrally mounted inside the chip. With a reference voltage, the error amplifier is able to compare the output voltage of the regulated circuit with the reference voltage. The output of the error amplifier is an analog signal proportional to the difference between the reference voltage and the output voltage. This signal is converted to a digital signal by a control logic circuit and used to control the gate voltage of the pass transistor. The control logic circuit also houses the current limit circuit, which provides short-circuit protection.

For efficient operation and good performance, the power supply voltage should be determined carefully and the maximum load current needs to be set to the correct level. The maximum permissible current and the output ripple voltage need to be taken into consideration when choosing the input voltage. The temperature should be kept within the acceptable range for good performance and to reduce the power dissipation.

When the output voltage is subject to a sudden load change, the regulators can use their own compensation network to reduce the response time and prevent overvoltage.The compensation network consists of a capacitor and/or resistor connected to ground and the regulator\'s output. The capacitor and the resistor cannot be connected directly to the output, but instead this connection should be made through the GND LINE. This connection is necessary to keep the regulator\'s output stable in the presence of a sudden load change.

The AN79L20 regulator incorporates all necessary protection features to protect the device from damage due to thermal, overload, and short circuit conditions. The thermal shutdown cuts off the output voltage when the device’s die temperature exceeds the threshold. This helps protect the device from overheating and subsequent damage.

The over-current protection protects the device from damage due to an overloaded or short-circuited output by limiting the output current. It uses a current-sensing circuit to detect when the current exceeds the set limit and shuts down the device to prevent further damage.

The AN79L20 is an efficient and reliable three-terminal adjustable regulator that can be utilized in a wide range of applications. Its features, such as excellent load regulation, line regulation, and transient response, make it suitable for low-noise high-efficiency power supplies, instrumentation, industrial control, precision reference, audio, telecom, and lighting applications. In addition, it has built-in protection circuits to protect it from overcurrent, overload, and thermal conditions.

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