IR1155STRPBF Integrated Circuits (ICs)

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Power Factor Correction (PFC) is a technique used to bring the power factor and efficiency of a system up to a desired level. The IR1155STRPBF is a member of the IR1155 family of integrated, low cost power factor correctors designed to meet the requirements of commercial, industrial and telecommunications systems. This article will discuss the application field and working principle of the IR1155STRPBF.

The IR1155STRPBF is ideal for use in applications that require high power factor and high efficiency. These include but are not limited to; computer power supplies, battery charging, solar charging systems, automotive systems, and high efficiency lighting.

The IR1155STRPBF features a buck-boost topology and uses two power switches to provide power factor correction. The first switch is used to boost the input voltage to a higher level while the second switch is used to reduce the output voltage to a lower level. Together, these two switches are able to maintain a desired power factor and efficiency throughout a wide input and load range.

The switching process of the IR1155STRPBF is controlled by digital and analog signals. The digital signals control the on/off states of the switches, and the analog signals are used to set the desired power factor, efficiency and current limit. When the power factor deviates from the set point, the switches are activated and deactivated to return the power factor to the desired level. The current limit function prevents the IR1155STRPBF from exceeding its current rating.

The IR1155STRPBF provides a high level of efficiency due to the operating frequency of 300kHz, which is significantly higher than the operating frequency of other power factor correction devices. Additionally, the device features a synchronous rectification topology and integrated gate drivers, thus providing improved thermal performance and a smaller board footprint.

The IR1155STRPBF provides a wide input voltage range and is capable of operating over a wide temperature range. The low on-resistance of the switches helps reduce switching losses and thus increase efficiency. The device features a startup current limit and current sensing feedback, allowing it to start up safely even in power restrictive environments.

In summary, the IR1155STRPBF is a low cost power factor correction device suitable for high power factor and high efficiency applications. Its buck-boost topology and integrated gate drivers provide a high level of efficiency at a wide input and load range. The device is also capable of wide temperature operation, high switching frequencies and low on-resistance switching, making it a great choice for designers looking to build efficient power systems.

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