L5991

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The L5991 is a highly integrated pulse width modulation (PWM) controller and power supply IC that is found in many types of equipment, and is often used for power management and power conversions. It includes several features that make it useful for applications including AC/DC and offline switchers.

Application Field: The L5991 is used in a wide array of electronic equipment, including computer motherboards, servers, televisions, monitors, printers, and other consumer electronics. It is also used to manage the power consumption in embedded systems and lighting systems.

The L5991 is often used in AC/DC and offline switchers, specifically designed to provide efficient power conversion and switching. The device is fully integrated and contains all the necessary components and circuitry needed for these types of applications.

Working Principle: The L5991 uses a Pulse Width Modulation (PWM) technique for the control of power supply output. It is essentially a power switch that is controlled by an internal oscillator and operated at a fixed frequency. The output of the oscillator is fed into a voltage comparator, which compares the oscillator output to a reference voltage. When the applied voltage is greater than the reference voltage, the output of the comparator changes states and the IC turns on the power switch.

In this way, the IC is able to control the power supply’s output by varying the pulse width at which the power switch is turned on and off. With this method, the power supply can be controlled to regulate the output voltage and current, providing an efficient manner of delivering power.

The L5991 also includes other features, such as protections against short circuit and overload conditions, as well as remote sensing and feedback loops that are used to ensure accurate control of the power supply.

The L5991 is an ideal solution for applications that require efficient power conversion and switching, such as AC/DC and offline switchers, and is suitable for a wide variety of electronic equipment. The device is highly integrated and contains all the necessary components and circuitry needed for a wide range of power management applications.

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