L4981B

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Power factor correction (PFC) is a technique used to reduce the amount of energy wasted in power distribution systems. This is accomplished by automatically adjusting the voltage and current output of the power factor correction device to improve efficiency, while maintaining a consistent power factor level. The L4981B is a linear PFC (power factor correction) controller designed to reduce the amount of energy lost in power distribution systems. It is designed to operate from a single-phase input AC mains supply. The L4981B is a linear PFC controller that provides a regulated output voltage with superior line and load regulation performance. It employs a fixed frequency current mode control scheme, which provides excellent transient response and output voltage accuracy.

The L4981B is designed to control the power factor correction of a single-phase AC/DC power supply operating from a wide range of AC mains voltages. The device is also able to detect input current distortion and can dynamically adjust the voltage and current output of the power factor correction device to ensure a power factor of 0.98 or higher and improved efficiency.

The L4981B has a wide range of features, such as power-limit control, programmable under-voltage lockout threshold and adjustable output voltage. The device also has a built-in over-temperature protection. The adjustable output voltage of the device can be used to compensate for load-line variations to prevent overshoot and undershoot. The device also supports a variety of operating modes such as continuous conduction, burst mode and discontinuous conduction modes.

In terms of applications, the L4981B is ideal for use in power factor correction applications such as AC/DC adapters and power supplies, LED lighting and motor drives. The device is designed to meet IEC61000-3-2 Class D standards, making it suitable for use in applications complying with European and international EMC regulations. It is also suitable for a variety of commercial and industrial applications.

The L4981B device is easy to implement such that no external components are required, thus minimizing system cost and design effort. The device can be integrated into an existing system to improve power factor performance for improved efficiency, reduced power consumption and increased power quality.

In summary, the L4981B device is a linear PFC controller designed to reduce the amount of energy wasted in power distribution systems. The device is designed to operate from a single-phase input AC mains supply and is suitable for a variety of commercial and industrial applications. It has a wide range of features and comes with built-in protection, making it perfect for AC/DC adapters, power supplies, LED lighting and motor drives.

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