Power Over Ethernet (PoE) Controllers

The MAX5922BEUI+ is a 100V DC-to-DC PoE (Power over Ethernet) controller designed to meet the needs of the Power Sourcing Server (PSE) market. It is available in three versions, offering either single-output, dual-output, or quad-output configurations. This controller is designed to provide a high level of power efficiency, as well as a wide range of switching frequencies and output voltages. By eliminating the need for an external voltage regulator, the MAX5922BEUI+ simplifies system design and increases performance.

Application Field

The MAX5922BEUI+ is an ideal solution for PoE (Power over Ethernet) applications where high power efficiency and low EMI (electro-magnetic interference) are required. It can be used to provide power to an array of PoE-enabled devices, such as wireless access points, security cameras, and VoIP phones. It is also suitable for high-end servers, network switches and routers.

Working Principle

The MAX5922BEUI+ is a synchronous rectangle buck controller. It converts a wide range of input voltage (100 VDC-110 VDC) to a fixed output voltage determined by the ratio between the on time (tON) and off time (tOFF) of the switching control signal. By optimizing the on and off time duty cycles, the controller can achieve high power efficiency across a wide range of output load conditions.

The controller contains an integrated low frequency switch mode voltage regulator that eliminates the need for an external voltage regulator. This allows the controller to be operated at lower frequencies than with a traditional DC-to-DC converter, resulting in improved power efficiency, lower EMI, and reduced bill-of-materials cost.

The MAX5922BEUI+ provides an adjustable switching frequency ranging from 100 kHz to 4 MHz, allowing for optimized performance for different power supply requirements. It includes three control loops: voltage loop (Vout), current loop (Iout), and power factor correction (PFC) loop.

Benefits

The MAX5922BEUI+ offers several advantages over traditional PoE controllers. It is designed to provide high power efficiency, low EMI, and a wide range of output voltages. In addition, its integrated voltage regulator eliminates the need for an external voltage regulator, simplifying system design and increasing performance. It also offers an adjustable switching frequency, allowing for optimized performance for different power supply requirements.

Conclusion

The MAX5922BEUI+ is an efficient, low-EMI PoE (Power over Ethernet) controller. It is designed to provide a high level of power efficiency, as well as a wide range of switching frequencies and output voltages. Its integrated voltage regulator eliminates the need for an external voltage regulator while its adjustable switching frequency allows for optimized performance. This makes the MAX5922BEUI+ an ideal solution for high power density PoE applications.