PD70211ILQ-TR

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Power over Ethernet (PoE) controllers are becoming increasingly popular for their high flexibility and low power consumption. PD70211ILQ-TR is one example of such a controller. This article will go into detail about its application field and working principle.

Application Field

The PD70211ILQ-TR PoE controller works in DC/DC Point-of-Load (PoL) designs to support power reversal (low power mode) and hot-swap events. This makes it ideal for applications such as industrial systems and any other systems that demand reliable and efficient power supply. It supports a wide range of input voltages, allowing it to be used in a variety of PoE environments.

The PD70211ILQ-TR controller operates in the medium power range, from 2 W to 12 W per channel. It is designed to achieve up to 95% efficiency in most medium power PoE applications. It is capable of sourcing up to 60 W of total power, but is limited to 120 W in tandem mode. The controller adjusts the output current to maintain a constant load as the input voltage varies.

In addition, the controller has an auxiliary power indicator (APWR) pin to indicate the presence of an external power source to support a load that needs more than 60 W. This makes the PD70211ILQ-TR a great solution for medium power PoE applications that require a high degree of flexibility and efficiency.

Working Principle

The PD70211ILQ-TR is designed to detect and control PoE power over at least one pair of transformer windings. It can be configured as either a Half-Bridge PoE controller or a Fully-Bridge PoE controller, depending on the application. The Half-Bridge configuration is designed for two winding applications, while the Fully-Bridge configuration is designed for systems with more than two winding connections.

In the Half-Bridge configuration, the PD70211ILQ-TR monitors the positive and negative power paths on the primary side for both power and voltage. The primary side detects any power or voltage-related issues, and the PD70211ILQ-TR responds accordingly by controlling the primary side of the PoE controller. If the voltage on the primary side is greater than the rated voltage, the controller will shut down the power to the secondary side and disable the output. Similarly, if the current on the primary side is greater than the rated current, the controller will shut down the output.

On the secondary side, there is a single winding connection between the PD70211ILQ-TR and the load, which can be configured as either a high current or low current mode. In the high current mode, the secondary side will draw up to 12W of power. In the low current mode, the controller will reduce the output and draw only 2W of power. This allows the controller to quickly switch from one application mode to another to maintain the desired power requirements.

The controller also incorporates various protection mechanisms to ensure that it operates safely under all conditions. The controller monitors the input and output voltages to prevent overvoltage and provides overcurrent protection. It also includes thermal shutdown, open and short circuit protection. These safety features make the PD70211ILQ-TR a reliable option for medium power PoE applications.

In conclusion, the PD70211ILQ-TR is a reliable and efficient PoE controller designed for medium power PoE applications such as industrial systems. It is designed to detect and control power over at least one pair of transformer windings and support power reversal and hot-swap events. In addition, it incorporates protection mechanisms to ensure safe operation. All these features make it the perfect choice for any medium power PoE system.

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