FSDH321

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FSDH321 is a Primary Side Regulation Universal Offline Switcher (PSRUOS) that integrates its own control to provide compact, high efficiency, low power offline AC/DC conversion. This device offers an efficient and cost-effective solution for medium-power AC/DC adapter designs, as well as for power adapters for consumer electronics such as PCs, disk drives, and game consoles.

Application Field

FSDH321 is used for medium-power AC/DC conversion and power adapter designs in consumer electronics. Its functions include input power conditioning and conversion of AC input voltage to a regulated DC output voltage. It is suitable for PCs, disk drives, game consoles, and other consumer electronics products. Due to its primary side regulation, the FSDH321 can eliminate the need for complex secondary-side loop designs, reduce component count, and save system cost.

Working Principle

FSDH321 operates in continuous conduction mode (CCM) and uses high-frequency cycle-by-cycle current limiting for output protection. Its integrated startup and control circuit provides stable and reliable operation over the entire input voltage range. The device is designed to detect the output current during overload and short circuit conditions, and limit the output current by cycling off the power switch to protect both the device and end product. On the other hand, its protection circuit also provides overvoltage, overtemperature, and line slew rate compensation protection.

The FSDH321 includes an innovative technique of primary-side regulation (PSR) which eliminates the need for a secondary-side feedback control circuit. This reduces component count and system cost, while maintaining a high level of reliability. The device employs a combination of fixed frequency oscillator and active-zero-crossing control to accurately regulate its output voltage. The control loop compensates for load variations through the use of a switch current limit controller. Additionally, the FSDH321 offers a number of useful features such as soft-start, input over-voltage protection, and over-temperature protection.

Overall, the FSDH321 is an ideal solution for medium power AC/DC conversion in consumer electronics and other applications. Its primary side regulation eliminates the need for complex and costly secondary-side loop designs and provides reliable and stable output voltage regulation. Additionally, its various protection and functionality features provide for a safe and efficient power conversion solution.

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