MP8008LGV-P

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Power over Ethernet (PoE) controllers enable the delivery of power-over-Ethernet to connected devices, allowing for remote powering of devices using a single connection. The MP8008LGV-P from Monolithic Power Systems is a PoE controller designed to enable high-efficiency operation. This article will discuss the application fields and working principle of the MP8008LGV-P.

Application Fields

The MP8008LGV-P is designed for applications where high-efficiency range from 30/60 Watts to an impressive 180/360 Watts of power via either an IEEE 802.3bt compliant type-1, type-2 and 4-pairs of direction connection or an IEEE 802.3at compliant type-1 and type-2 connection. This wide range of operating power enables flexibility in powering a variety of PoE devices. The MP8008LGV-P is highly integrated, with an integrated 6V voltage regulator and a 20.7A peak Output Switch providing an output voltage that is adjustable between 4.5V and 48V.

The MP8008LGV-P also features an internal GND-based safety capacitor which reduces the high-potential of the power conductor when high power is consumed from the PoE port, thus protecting users from electric shock or fire. In addition, the controller is a low-power device with a quiescent current of 100μA and the output voltage is DCM regulated, which improves system efficiency by reducing power dissipation. This, in turn, reduces component size, lowers system costs, and aids in rapid product development.

Working Principle

The MP8008LGV-P is designed with a modular approach to power over Ethernet, allowing for flexible and easy deployment. When power is detected on the PoE port, the controller begins its power-conversion process. It first begins by conditioning the voltage that is measured at the PoE port, to compensate for variations in cable length, temperature and other environmental factors. The conditioned voltage is next compared with the Voltage Controlled Oscillator (VCO) to determine the proper voltage threshold for the power over Ethernet ports.

The voltage threshold is then compared to pre-defined programmable thresholds to determine the operating power range, enabling the MP8008LGV-P to dynamically adjust and optimize the output voltage. The controller is capable of providing a demand-based output power, based on the output current that is detected on the output pins. The output power will be adjusted and will decelerate as the output current increases, with the exception of maximum resistance, which is preset and protected by the controller.

The controller also features an integrated LED Driver that can be used to control any combination of LED lighting on the PoE port. The LED Driver can be programmed to indicate various power states such as standby, link, high-power, and faults. This feature simplifies the design of PoE products, helping to reduce development costs.

Conclusion

The MP8008LGV-P from Monolithic Power Systems is a PoE controller designed to enable high-efficiency operation from 30/60 Watts to an impressive 180/360 Watts of power. It is suitable for a variety of PoE devices, featuring an integrated 6V voltage regulator and a 20.7A peak Output Switch. The controller is highly integrated with added features for flexibility and easy deployment, such as the integrated LED Driver, pre-defined programmable thresholds and an internal GND-based safety capacitor.

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