AN15853B Integrated Circuits (ICs)

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Specialized ICs

The AN15853B is one of the many specialized integrated circuits on the market. It is a monolithic step-down regulator with a wide variety of uses and applications. The IC is a 3-A, current-mode pulse-width modulation (PWM) device, featuring a wide input voltage range, wide output load range, a low quiescent current and excellent line regulation capabilities.

AN15853B is primarily used in automotive applications, since it is capable of both low and high-impedance output loads. It can be used to provide regulated power to any DC or AC load, including motors in automotive systems. The IC can also be used in consumer, industrial, and medical equipment for isolated power supplies. It is designed to be able to handle a wide range of input and output voltages and currents, making it highly versatile.

Features

The primary features of the AN15853B include:

• 3-A output (configurable as low or high impedance)
• Wide input voltage range (4.5 to 30 V)
• Wide output voltage range (2.5 to 25 V)
• High switching frequency (up to 100 kHz)
• Low quiescent current of 0.3 mA (at 12 V input)
• Excellent line regulation
• Robust protection features

Working Principle

The AN15853B utilizes current mode control and Pulse Width Modulation to control output voltage. The IC is based on a constant-off time topology, with a variable-frequency switch. The switch oscillates between two fixed current levels, with a variable frequency. This oscillation creates a PWM signal that regulates the output. The oscillation frequency is determined by the slope of the current signal at the lower current level.

The AN15853B uses a voltage loop to regulate the output, as well as to control the current in the switch. The voltage loop senses the output voltage, and by adjusting the switching frequency, the IC is able to maintain the desired output voltage. The loop also regulates the current in the switch, which is controlled by the voltage loop.

The IC also features a number of protection features, including an adjustable protection threshold, an over-temperature protection circuit, and a soft-start circuit. These features provide a robust, reliable voltage regulation in a wide range of applications.

Conclusion

The AN15853B is a specialized IC that is useful for a variety of applications. It is capable of providing line regulated power to DC and AC loads, as well as having a wide input and output voltage range. The IC also has a low quiescent current and robust protection features. With its current mode control and PWM, the IC is well-suited for automotive and other applications in need of voltage regulation.

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