FAN7621BSJX

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The FAN7621BSJX is a device from Fairchild Semiconductor Corporation and is part of the PMIC - AC DC Converters, Offline Switchers category. It is a high efficiency, cost-effective and low power consumption AC-DC switching mode power supply IC with integrated PFM controller, MOSFET, Schottky diode, and combination of EMI filter that offers an outstanding performance in both flyback and forward converter topologies.

The FAN7621BSJX supports a universal AC input voltage range of 85Vac to 265Vac, making it suitable for a wide range of applications in different markets such as consumer and industrial products. Additionally, the device provides an adjustable output voltage range of 12Vdc to 20Vdc and a maximum continuous output current of 2A, making it capable of providing power delivery of up to 40W in some designs. The high efficiency of this device allows for a reduced amount of heat generation and maximizes the power saving features for the application.

The FAN7621BSJX includes a built-in PFM controller, compatibility with external PFC controllers, and an integrated MOSFET. It also includes an 8-pin package, enabling customers to utilize size-efficiency while achieving better power management. The integrated EMI filter minimizes radiated and conducted noise, making it suitable for even noisier industrial environments.

The device offers a wide range of threshold voltages from 6.5 to 18V, and a frequency selection range from 30kHz to 90kHz, making it suitable for different topologies and a variety of applications. Additionally, the FAN7621BSJX features over-temperature protection and overtemperature protection for safe operation, as well as output overvoltage protection, output short circuit protection, and open loop protection. All of these features make the FAN7621BSJX a reliable and feature-rich device for AC to DC power conversion.

The FAN7621BSJX’s working principle is based on the flyback topology where the AC voltage input is rectified and filtered, then sent to the primary MOSFET of the transformer. When the primary MOSFET is switched off, energy is stored in the transformer, then it is converted to the output voltage at the secondary side of the transformer. Finally, the output voltage is regulated with a PWM controller or other loop feedback circuit. This allows for a highly efficient, low-cost solution for AC to DC power conversion.

The FAN7621BSJX is a cost-effective and highly efficient solution for AC-DC conversion applications. It offers a wide range of features, including adjustable output voltage range, integrated EMI filter, over-temperature and overvoltage protection, and more. The device is based on the flyback topology and is a viable solution for a variety of applications such as consumer and industrial products, portable chargers, and other electronics applications.

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