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ISL6730CFUZ Application Field and Working Principle

ISL6730CFUZ is a Power Factor Correction (PFC) Integrated Circuit (IC) which is specifically designed by Intersil Corporation to be used in offline power supplies. It is a two-stage power factor correction solution which combines a PFC pre-regulator with a PWM controller.

PFC stands for Power Factor Correction, and is a method employed to ensure that the load current drawn by an electrical apparatus is \'in-phase\' with its voltage. When the current and voltage are in phase, the power factor is 1. When the current and voltage are out of phase, the power factor is less than 1, and this causes losses in the power system. PFC circuits are used in a wide range of applications, from power inverters, power adapters and single-phase AC-DC as well as DC-DC converters.

The ISL6730CFUZ integrates both the PFC pre-regulator and the PWM controller into a single package to achieve system-level benefits. The PFC pre-regulator helps to increase the efficiency and reduce the size of the power supply while the PWM controller receives the rectified and filtered DC voltage, and converts it into a sinusoidal voltage waveform without any harmonic distortion.

ISL6730CFUZ Application Fields

The ISL6730CFUZ is one of the most popular ICs used for PFC applications. Its popularity stems from its compact size and its exceptionally low component count. The ISL6730CFUZ is designed for applications such as notebook and external adapter power supplies, plasma and LCD TVs, telecom equipment, and multi-output multiple frequency converters. It is also well suited for applications such as photovoltaic inverter, ac drives, battery chargers, and direct ac-ac converters.

ISL6730CFUZ Working Principle

The ISL6730CFUZ consists of two parts – the preregulator and the PWM controller. The preregulator is composed of a high-side MOSFET ( Field-effect transistor) and a low-side MOSFET. The PWM controller is composed of an oscillator, a comparator, and a series of logic circuits. The oscillator generates a fixed frequency square wave, and the comparator compares the level of the waveform with a reference voltage. The output of the comparator then controls the conduction of the high-side and low side MOSFETs.

The preregulator blocks the line frequencies from entering the load, and the PWM controller adjusts its duty cycle in order to control average load current. The controller also provides protections such as Under Voltage Lockout (UVLO) and Over Voltage Protection (OVP). Additionally, it also includes a soft-start circuitry to ensure a gradual ramp up of the output voltage.

Overall, the ISL6730CFUZ is a sophisticated IC which offers a simple and efficient two-stage power factor correction solution. With its low component count, compact size and flexible operating parameters, it is perfectly suited for a variety of power supply applications.

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