TPS2383PMG4

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Power over Ethernet (PoE) is a technology for delivering both power and data over Ethernet cables, allowing more efficient use of space, installation time, and energy. The TPS2383PMG4 from Texas Instruments is a fully integrated PoE power supply and high-side current monitor (HCM) system solution used in PoE applications. It is the world’s first high-current, high-resolution controller of its kind. In this article, we’ll explore the application field and working principles of the TPS2383PMG4.

Application Field of TPS2383PMG4

The TPS2383PMG4 is a very versatile component and can be used in multiple applications with different roles. It is primarily used as a PoE controller with its ability to power multiple devices simultaneously over Ethernet cabling. It is designed for low-cost, low-power, high-performance applications in the automotive, medical, industrial, power monitoring, and consumer electronics markets. Furthermore, it can also be used as a replacement for a traditional PoE source and as a current monitor for over-current protection.

Working Principle of TPS2383PMG4

The TPS2383PMG4 is designed to operate with both DC and AC inputs. It converts any DC input up to 72 V into a constant DC voltage of 24 V, with a minimum load current of 1.1 mA. The internal current monitor and HCM-controlled gate drivers are capable of sensing up to 10 A of total current and up to 8 A of off-state current. The TPS2383PMG4 can also be operated as a standalone device, using its internal structure to perform the tasks assigned to it by the system or application.

In PoE applications, the TPS2383PMG4 applies two distinct functions. First, it supplies the required 24 VDC to the device receiving the power, while simultaneously monitoring the power consumption of the device. Second, it restricts the amount of current that can be drawn from the PoE stack, providing protection from over-current fault conditions. All this is done by utilizing a high-side current monitor which senses and compares the actual current to the set limit.

The integrated power-switching circuitry of the TPS2383PMG4 allows for efficient power management by preventing current surges during device switching events. The device is also equipped with an on-chip voltage regulator, which is used to convert an input voltage of up to 72 VDC into an output voltage of 24 VDC with a minimum load current of 1.1 mA.

The TPS2383PMG4 supports advanced fault detection and reporting using its internal analog-to-digital converters (ADCs). The ADCs are used to monitor and detect circuit faults, such as over-voltage, under-voltage, short-circuit, and high temperature conditions. In case of a fault, the device can be shut down and/or an alert can be triggered to an external system.

Finally, the TPS2383PMG4 is also capable of auto-sensing the PoE port’s classification parameters. This allows it to automatically identify and configure the appropriate power output needed to power the connected device. It also supports a wide range of power profile options, allowing it to adapt to varying application requirements.

Conclusion

The TPS2383PMG4 is an advanced and versatile PoE controller with numerous applications. It provides high-current and high-resolution PoE power supply and current monitoring, as well as advanced fault detection and reporting capabilities. With its ability to monitor and control multiple devices, the TPS2383PMG4 is the perfect solution for applications such as automotive, medical, industrial, power monitoring, and consumer electronics.

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