FSQ500N

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The FSQ500N is an isolated offline switcher ideal for applications of up to 500 watts. It features an active power factor correction (PFC) circuit which improves efficiency and power distribution. This makes it ideal for use in industrial and consumer applications. The FSQ500N is designed to meet high safety and EMI/EMC standards, as well as IEC60950 and UL60950 safety standards. With its small form factor, it is also the perfect solution for applications with limited space requirements.

The FSQ500N is a single stage, single switch, active rectifier type AC/DC converter. The device includes a primary side boost PFC stage with a hysteretic power-limit control. The device also includes a constant on-time secondary side switch which is enabled by the primary synch signal. The secondary side controller provides constant current/voltage regulation and output current/voltage protection in the same package. This device is primarily used for small to medium power applications where cost and efficiency are key factors.

The primary side of the FSQ500N is designed to draw a near-constant level of input current over a wide range of input voltages. The input current is shaped using an active power factor correction circuit and is further controlled by the primary side PFC controller. This controller allows the device to be operated over a wide input voltage range without consuming excessive power.

On the secondary side of the FSQ500N, a constant on-time (COT) control scheme is used to provide output regulation. The COT controller drives an external FET which is connected to the output filter capacitors. This regulates the output voltage and current, ensuring the load receives the correct voltage and current within the required parameters. For higher output power applications, a synchronous FET can be added to the secondary side switching circuit for increased efficiency.

The FSQ500N is a highly efficient, cost-effective device for applications up to 500 watts. It offers both active power factor correction and constant on-time regulation in an integrated package, allowing for a small form factor and superior reliability. With its reliable performance and wide input voltage range, the FSQ500N is an excellent choice for a variety of industrial and consumer applications.

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