UC3855ADW

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Power Factor Correction (PFC) is an electronic technology that is used to improve the electrical power efficiency of a power system. It is used to increase the power factor by reducing harmonic currents and improving the voltage waveform so as to increase the efficiency of the power system. The power factor is the ratio of active power (watts) delivered to the load to the product of the rms current and voltage of the system. PFC is used in many applications ranging from residential applications to commercial applications such as data centers and factories. UC3855ADW is a power factor correction (PFC) integrated circuit. This integrated circuit is an ideal solution for increasing the efficiency of a power system.

The UC3855ADW is a power factor correction IC typically used in fixed frequency and voltage mode switching power supplies to control the input current waveform and achieve power factor correction. It features low input power dissipation, low start-up current, adjustable operating frequency, and a spread spectrum control. This integrated circuit has a built-in temperature protection circuit that prevents thermal runaway and overheating. It also offers the capability of parallel operation.

The UC3855ADW operates with a low voltage supply, which allows it to be used in low voltage circuits. The input voltage range is from 5V to 36V with a rated output current of 300mA, and the output voltage range is from 0V to 11V with a rated output current of 5A. The typical switching frequency range is from 150KHz to 250KHz. The Spread Spectrum control reduces electromagnetic interference (EMI) by evenly spreading the frequency spectrum across a range.

The UC3855ADW uses an emulated peak current mode resulting in reliable operation and protection over a wide range of line and load conditions. This integrated circuit offers protection against overvoltage, overload, overtemperature and creepage faults. It also provides a soft-start circuit to avoid current glitches during start-up.

The UC3855ADW is a highly integrated PFC IC that offers excellent power factor performance. It is suitable for fixed frequency and voltage mode power supplies. It can be used in a wide range of applications ranging from ac-dc power supplies to lighting systems. The spread spectrum control reduces electromagnetic interference (EMI) making it an ideal choice for noise-sensitive applications. It also offers low input power dissipation and low start-up current allowing it to be used in low voltage circuits.

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