FSCQ0765RTYDTU

PMIC - AC DC Converters, Offline Switchers

FSCQ0765RTYDTU is a high performance integrated circuit, which integrates both AC and DC switching converters, and is intended for offline power supply applications. This IC is able to provide up to 1.5 Amps output current and has a frequency range of up to 57kHz. It also features low standby power loss, peak current mode control and high efficiency.

Application Field

FSCQ0765RTYDTU is mainly used in AC-DC adapters and power supplies, with some applications in AC-DC lighting and industrial equipment, as well as robotics and consumer applications. This integration allows for a small and low cost solution, while simultaneously improving efficiency and performance.

Working Principle

The FSCQ0765RTYDTU device combines an AC/DC converter with both a controller and an output current-driven switching topology. The AC/DC converter employs a full-bridge diode rectifier, while the controller and output current-driven switching consists of two stages. The two stages allow the device to switch from the AC to DC output voltage after a current limiting stage takes place.

The AC input voltage is rectified to a DC voltage level and is then fed to the controller for autonomous operation of the power switch. The power switch is then used to convert the rectified AC input voltage to a stable DC output voltage. This is done by regulating the output current. In order to achieve optimal efficiency, the switch is modulated to cycle through a range of duty cycles.

The FSCQ0765RTYDTU IC also includes additional features such as over temperature protection, over voltage protection, over current protection, and output voltage ripple cancellation. Additionally, the IC includes a soft start feature to provide current ramp to prevent inrush current which commonly occurs during powering up of the device.

Conclusion

The FSCQ0765RTYDTU integrated circuit is a versatile solution for applications in offline power supplies. It integrates AC and DC switching converters in a single IC, allowing for a small and low cost solution while at the same time providing excellent performance. It allows for control of the AC/DC conversion process through a full-bridge diode rectifier and current limiting stages, allowing for optimal efficiency and power saving.