FSFM300N

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The FSFM300N, manufactured by ON Semiconductor, is an integrated offline switcher. It is a quasi-resonant ac-dc converter and is designed to convert an input voltage of 90-264V AC to a single output voltage ranging from 3.3V to 50V. It is suitable for general series applications such as adapters, gaming systems, TVs and monitors, lighting, and motor drives. This device is cost-effective, efficient and highly reliable due to its multiple protection features, such as overvoltage protection, short circuit protection, and current limit protection.

The FSFM300N block diagram is given below. It comprises rectifier, controller, driver, and on/off switch stage. It has an integrated PFC, LDO, and EMI filter as shown in the diagram.

The PFC (Power Factor Correction) stage is a mosfet-based one-stage preregulator which is powered by an external MOSFET, integrated clamp, and compensation. The driver consists of a high-voltage buck driver and a low-voltage boost driver with a current-mode control. The gate driver is a high-side and low-side with 1.5A logic swing. The controller includes an AC input voltage sensing stage and a DC output voltage sensing stage to monitor the input and output voltages respectively. The controller also includes a duty cycle control circuit, an over current protection circuit, and a SW pin to control the on/off state of the converter.

The working principle of this device is illustrated below. The input voltage is rectified by the input rectifier. The rectified voltage is then applied to the PFC stage where it is filtered and regulated to the constant DC voltage. This regulated voltage is then fed to the controller for output regulation. The controller uses the feedback from the output voltage sensing stage to control the on/off state of the converter and to regulate the output voltage to the desired set level. Finally, the output voltage is regulated by the driver stage to achieve the regulated output voltage. The on/off control circuit of the driver stage is used to turn the converter on or off.

In conclusion, the FSFM300N is an offline switcher which can be used in various applications such as adapters, gaming systems, TVs and monitors, lighting, and motor drives. It is cost-effective, efficient, and highly reliable because of its multiple protection features. The working principle of the device is explained in detail above. It is a quasi-resonant ac-dc converter and is designed to convert an input voltage of 90-264V AC to a single output voltage ranging from 3.3V to 50V.

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