MAX5922CEUI+T

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Power Over Ethernet (PoE) Controllers are important devices used in networks and communication systems. PoE controllers provide power over the Ethernet cable, and are an efficient way of providing power to devices in remote locations. A key component in the design of PoE controllers is the MAX5922CEUI+T. This application note will discuss the application field and working principle of the MAX5922CEUI+T.

The MAX5922CEUI+T is a fully integrated single-chip, Power Over Ethernet (PoE) controller for IEEE802.3-compliant Powered Devices (PDs). It integrates both DC-DC controllers and a Linear Regulator, and supports both Passive PoE and IEEE802.3af-compliant PoE. It also includes a Mains Power Relay and provides fault protection for both Mains and PoE power sources. The MAX5922 can be used in a variety of network systems.

The MAX5922CEUI+T is designed to work in two modes. In “Idle” mode, the MAX5922 will detect the input voltage, current and polarity of the PoE source. If the voltage is below safe operating levels, the MAX5922 will automatically shut down the connected PDs. In “Active” mode, the MAX5922 will provide power to the PDs at up to 25.5W (9-57V). It will also monitor the PDs power usage and adjust the input current accordingly.

The MAX5922CEUI+T is well suited for a variety of applications, including intelligent lighting systems, security systems, IP cameras, IP phones, Wireless Access Points, and wireless peripherals. It can be used to provide power to the PDs even during periods of power loss, and can provide a cost-effective solution for powering PDs in remote locations. Additionally, the MAX5922CEUI+T supports up to 77V input voltage and provides overvoltage, short circuit, and over-temperature protections.

The MAX5922CEUI+T uses a Flyback converter to control the output voltage. The Flyback topology consists of a power switch, an energy storage inductor, a diode and a capacitor. The power switch is driven by a high voltage pulse width modulation (PWM) signal. When the switch is closed, a voltage is induced across the inductor, which is then rectified by the diode and stored in the output capacitor. The PWM signal can then be used to adjust the output voltage.

The MAX5922CEUI+T also uses a linear regulator to ensure accurate power delivery. The linear regulator is designed to provide a stable voltage, while limiting the output current. It works by monitoring the output voltage and adjusting the current in order to maintain the desired output. This ensures that the output voltage stays within the specified range, even when the input voltage changes.

The MAX5922CEUI+T is designed to meet all of the requirements of IEEE802.3af PoE. It is capable of providing up to 25.5W of power, and supports data rates of up to 100Mbps. It also includes all of the necessary protection features for the safe operation of the PDs. Furthermore, the MAX5922CEUI+T has a very low noise operation and minimal impact on EMI performance.

The MAX5922CEUI+T provides a highly integrated solution for powering PDs. It is an efficient and cost effective way to provide power to remote devices, and is well suited for a variety of applications. The MAX5922CEUI+T includes both a Flyback and Linear Regulator, allowing for the accurate delivery of power and ensuring the safety of the device.

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