PD81101EVB-21WB

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Power Over Ethernet (PoE) Controllers allow electrical power, Sending data signals and electrical power at the same time over a single cable. A PoE Controller (PD81101EVB-21WB) is a power management integrated circuit that manages the power needs of Powered Devices (PDs) without the need of an external power supply system. This type of PD Controller applies out-of-band control, meaning that the device control plane may control the circuit plane, and vice versa.  Application FieldThe PD81101EVB-21WB is an example of a PoE controller that can provide up to 30W of power in both 802.3af and 802.3at modes. It is capable of handling advanced power management strategies, time-of-use (ToU), and over-temperature protection for safety. This controller suits best for PD devices that require up to 30W power such as in IEEE 802.3at/4PPoE applications, for Amazon Echo, CCTV Surveillance, and Electric Vehicles.  Working PrincipleIn general, PD controllers manage the power that a device receives over Ethernet. The PoE controller, PD81101EVB-21WB, follows a 2-phase PWM structure and main principle of working is Max Power Point Tracking (MPPT). It features one output with a programmable current limit to prevent over-current. The device can be used to settle the maximum output power, support adaptive power-mode function, and it can safely turn off the PoE output when the over-temperature alarm is triggered. It also works with the ‘Power-Saving Algorithm’, which can modify the current limit of switch to reduce power consumption. In conclusion, PD81101EVB-21WB controller is perfect for PDs that require up to 30W power than usual power supply systems. It features adaptive power-mode control and built-in temperature protection so that the current limit is reduced and excessive heat can be avoided. The controller also comes with PoE timing controls, enabling/disabling functions, and with Energy Management Unit so that efficient and relatively safe power management can be managed.

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