UC2854BQG3

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PMIC or Power Management Integrated Circuit (PMIC) is an integrated circuit that enables the management of power delivered to a system. Power management is a key component in almost any electronic system and is becoming increasingly important in an ever-increasing range of applications. The UC2854BQG3 is one such PMIC, providing power factor correction (PFC) features that ensure high efficiency, tight output regulation and excellent power factor in isolated power systems.

The UC2854BQG cannot function without an external PFC boost inductor, which serves as the power factor correction component of the overall PFC system. This inductor helps to reduce power losses resulting from voltage drop across the power supply network. In combination with the UC2854BQG, the PFC boost inductor helps to achieve near-perfect operation of the power factor correction system over varying combinations of load conditions. The UC2854BQG includes a full bridge of controlled rectifier circuits and an output filter, and is capable of up to 95% power factor correction for loads ranging from a few watts up to several hundred watts.

The UC2854BQG3\'s power factor correction is based on an average current-mode control (ACMC) technique which allows maximum flexibility and performance, while also providing a high power factor correction accuracy of typically 1% error. The integrated current-sense amplifier of the UC2854BQG3 provides a low-loss monitoring of the power supply current level with a standard 0.2V input signal to the IC, eliminating the need for an external current sense resistor. The onboard boost inductor and power factor adjustment controller enable the device to continuously adjust the output frequency to maintain high power factor, even over varying load conditions.

The UC2854BQG3\'s high-efficiency power factor feature offers a variety of benefits, including improved power efficiency and reduced component count resulting from the elimination of the need for an external current sense resistor. It is also inherently protected from voltage and current transients in the output network, offering significant cost savings in component choices for the system designer. Additionally, the chip\'s internal circuit protections (IPL) provide unlimited protection against power interrupts and over-current faults.

The UC2854BQG3 is a viable solution for power factor correction and power management applications, where high efficiency and power factor accuracy are requirements. Because of its low-EMI switching characteristics, the UC2854BQG3 is also an ideal solution for systems with stringent EMC/EMI performance requirements. The UC2854BQG3 is designed for maximum flexibility and efficiency, with a wide input range and capable of supporting both single and two-phase operation. It is offered in SOIC-14 and TSSOP-14 leadless packages, and with an adjustable frequency range of 200~700kHz. This makes the UC2854BQG3 ideal for a range of applications, from low-power applications that require only a single stage of power factor correction to more demanding applications where multiple stages of power stage correction may be required.

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