LT1248CS#PBF

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The LT1248CS#PBF is a versatile power factor correction (PFC) device engineered to optimize power efficiency and reduce the input current distortion in AC-DC power conversion systems. This chip offers impressive integration and reliability while supporting industry-standard current and voltage requirements. The LT1248CS#PBF is ideal for a wide variety of applications where energy efficiency improvement is desired, such as servers and appliances.

The working principle of the LT1248CS#PBF is based on a boost topology with a reverse-polarity feature to ensure the compliance with the current rules for harmonic distortion. This device is able to detect the input signal magnitude and phase and after the comparison, the precise valuation of power factor and harmonic content can be achieved. Specifically, it performs compensation for both voltage sag/spike and harmonic distortion caused by the nonlinear load current. Once detected, the current waveform is modified according to the specific requirements in order to reduce input current distortion. In order to ensure stability, a feedforward control system is implemented and the LT1248CS#PBF provides a precise output control thanks to the input line voltage measurement.

The LT1248CS#PBF is an efficient solution for a wide range of current and voltage applications, allowing up to 2A of output current using a 5V input, while ensuring a power factor up to 0.99. The chip integrates a high-voltage MOSFET capable of driving up to 300W of power, superior to most current PFC solutions. Moreover, good transient performance and dynamic response are provided, thanks to its reverse-polarity protection, high-current sense and high-speed output.

Another important feature of the LT1248CS#PBF is the integration of power-supply sequencing, which is required to align the power-up of the system and the PFC circuit itself. This allows the PFC to be turned off in standby mode, in order to reduce power losses and extend product lifetime. The sequencing is customizable and programmable, allowing the user to control the timing and order of device activation.

The LT1248CS#PBF is an ideal choice for a variety of low-power AC-DC power converters. Thanks to its impressive integration features, it can be utilized to reduce the number of components and board space within power supplies. The chip also offers superior power efficiency, improved power factor and harmonic contents, along with reduced system costs that guarantee a long-term return on investment.

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