FAN6961SY Integrated Circuits (ICs)

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Introduction to FAN6961SY Application Field and Working Principle

FAN6961SY is a power factor correction (PFC) integrated circuit made by Fairchild Semiconductor. The chip has a switching frequency of up to 500kHz, a supply voltage range of 4.5V to 16.5V, and can handle an output current of up to 800mA. Its primary application is to convert an alternating current (AC) from the main to a direct current (DC) in a power supply. It can be used in different application areas such as switching power supplies, high-voltage motor speed controllers and more. The FAN6961SY works by switching the voltage and current between two states. It is designed to synchronize the input voltage and current phases, resulting in a more stable and efficient power supply.

Working Principle

The FAN6961SY operates on the principle of Bridge Rectifier which is the most common type of power factor correction technique used in switching power supplies. This technique works by connecting a diode bridge to the incoming AC power source. The load is connected to the output of the diode bridge, and the diode bridge acts like a full-wave rectifier, converting the waveform of the alternating current into a direct current.

The FAN6961SY combines a fixed frequency and PWM-controlled power factor correction architecture. The chip provides active power factor correction (PFC) by switching the voltage and current between two states. The FAN6961SY is designed to synchronize the input voltage and current phases, resulting in a more stable and efficient power supply. The chip also supports power sequencing of multiple power supplies and also provides over current, over voltage and open circuit protection.

The chip also features an input AC line monitor circuit which detects the AC line voltage amplitude and irregularity and gives output signals based on the value. The input current mode control is further divided into an inner voltage loop and outer current loop. The inner voltage loop modifies the voltage reference based on the line level while the outer current loop maintains the input power factor by adjusting the duty cycle of the output PWM signal.

The chip also features an output voltage regulation loop to maintain the output voltage at its set value. This regulation loop monitors the output voltage and adjusts the pulse width pulse width modulation (PWM) signal accordingly to ensure the output voltage is regulated. The FAN6961SY also includes a visual indication of the output voltage and current.

FAN6961SY also integrated a gate driver circuit which automatically detects the output load current and the load voltage and can be switched between two stages, high voltage and low voltage. This enables the chip to offer an optimized battery charger for mobile devices.

In a nutshell, the FAN6961SY PFC IC offers many new features and benefits when it comes to power factor correction. Not only does it offer efficient conversion of AC power into DC power, but it also provides various protection features, precision control of the output voltage and current, and a visual indication of the output voltage and current.

Conclusion

The FAN6961SY is a power factor correction (PFC) integrated circuit made by Fairchild Semiconductor. It helps to synchronize the alternating current (AC) from the main to a direct current (DC) in a power supply. It works on the principle of Bridge Rectifier and combines fixed frequency and PWM-controlled. The chip also supports power sequencing of multiple power supplies and also provides over current, over voltage and open circuit protection. It also includes an input AC line monitor circuit, an output voltage regulation loop, a gate driver circuit and an input current mode control. In conclusion, FAN6961SY PFC IC offers many advantages and benefits when it comes to power factor correction.

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