8D517W75AD

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

The 8D517W75AD is a dual-channel active power factor correction PFC control IC, used in active AC/DC converters and AC/DC power supplies. The device requires minimum component configuration, and provides both continuous conduction mode (CCM) and discontinuous conduction mode (DCM) operation, allowing designers to build a wide range of power supplies from low-cost standby units to high-power applications with excellent power factor. Applications and working principles are discussed in this article.

Applications

Due to the features inherent in the 8D517W75AD, the IC can be used in a variety of different applications. This includes AC/DC power supply and filtering, domestic appliance power supply (PSU), LED lighting, active power factor correction (PFC), and motor control. With good regulation performance, reliable current sensing, and minimum external components required, the 8D517W75AD makes a great choice for all of these applications.

Power Factor Correction (PFC)

Power factor (PF) correction is the process of adjusting an incoming AC power supply to achieve a desired PF for better power quality and efficiency. This is done by controlling the power-electronic components in the power circuit, so as to minimize harmonics and load the system with a PF approaching unity. The 8D517W75AD helps accomplish this by controlling several power components via the use of a standard PFC circuit. This circuit consists of a single-phase full-bridge rectifier, an inductor, two capacitors and a free-wheeling diode. The 8D517W75AD detects the input voltage, current and rectified voltage to actively control the power components in the circuit.

Continuous Conduction Mode (CCM) and Discontinuous Conduction Mode (DCM)

Depending on the design, the 8D517W75AD can be used in either continuous conduction mode (CCM) or discontinuous conduction mode (DCM). In CCM, the inductor current continues to flow during the entire switch period, while in DCM, the inductor current drops to zero during a portion of each switch period. The 8D517W75AD will automatically switch from CCM to DCM depending on the load and input conditions, providing flexibility for the designer. Additionally, the 8D517W75AD has the ability to sense the output voltage, so as to keep the output voltage regulation constant, even as the load changes.

Conclusion

The 8D517W75AD dual-channel active power factor correction PFC control IC is a useful tool for achieving high power factor, high efficiency and low harmonic distortion in AC/DC power supply and filtering, LED lighting, motor control and domestic appliance power supply applications. With its ability to provide CCM and DCM operation, the 8D517W75AD is a great choice for power-electronic engineers looking to design a wide range of power supplies.

The specific data is subject to PDF, and the above content is for reference