FSFA2100

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The FSFA2100 is a CMOS-based integrated power supply controller that is designed specifically for regulating and controlling the power of low-power AC/DC converters, offline switching power supplies and active power factor circuit (PFC) application. It is an advanced and highly integrated power supply controller that has many features and functions, including fast start-up and protection against hazardous overvoltage and overcurrent conditions. The FSFA2100 integrates an entire power system within a single controller, allowing for a smaller, more efficient, and significantly less expensive power system design. This article will discuss the FSFA2100’s application field and working principle.

The FSFA2100 is suitable for low-power AC/DC converters and offline switching power supplies that have an input voltage range of 85V to 265V AC. This makes it ideal for powering low-power lighting, home appliances, audio/video equipment, motor control, and many other applications. It is also suitable for many active PFC (power factor correction) circuits since it has a wide input voltage range and is capable of providing high efficiency.

The FSFA2100 can provide up to 1.3 W of output power, with a maximum output voltage of 26 V and a maximum output current of 50 mA. This makes it suitable for applications that require low-power components, such as relays and small digital signal processors (DSPs). It also has a low quiescent current of 85 μA and a low standby flag, allowing it to reduce power consumption significantly.

The FSFA2100 is designed with a variable frequency and variable duty cycle modulator, which enables it to take advantage of a PFC controller’s natural frequency reduction capabilities. This can improve the efficiency of the power supply circuit by reducing switching losses. The FSFA2100 is also capable of providing multiple output voltages, allowing it to support a wide range of applications.

The FSFA2100 uses a basic voltage closed-loop control to regulate the output voltage of its power supply system. It uses a high-precision voltage reference to monitor the output voltage and implement current-mode feedback control. The current-mode feedback control is used to maintain the correct output voltage, even when the load or input voltage changes. This ensures that the output voltage is always accurate and stable, even under varying conditions.

FSFA2100 also has a number of protection features that help to ensure safe and reliable operation of the power supply system. It includes an overvoltage protection (OVP) that will shut off the system if the output voltage exceeds a certain level. It also includes an overcurrent protection (OCP) that will limit the output current if it reaches a certain level. This prevents any short circuits or other hazardous conditions from occurring.

The FSFA2100 also includes an LED driver to provide an indication of the power status and also to facilitate device testing in the manufacturing process. The LED driver is designed to change its duty cycle as the output voltage changes, providing visual feedback of the output voltage status. In addition, the LED driver can also be used to provide a logic control signal to other components, allowing the system to be monitored.

The FSFA2100 is a very versatile and efficient device that is designed specifically for AC/DC converters, offline switchers, and active PFC circuits. Its low quiescent current, wide input voltage and multiple output voltages, and various protection features make it ideal for powering low-power applications. Its current-mode feedback control provides stable and accurate output voltage regulation, which helps to ensure the safe and reliable operation of the power supply system. Its LED driver provides visual feedback and can also be used for logic control, providing further flexibility for the system.

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