TPS2378DDA

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The Texas Instruments TPS2378DDA is a power multiplexer controller offering comprehensive support for Power-over-Ethernet and other DC supply power sources. This device is designed to streamline and simplify the deployment of PoE systems by optimal use of all available power sources, such as a DC power supply, rectified AC mains, and/or Power-over-Ethernet connections. The device also offers many integrated features, such as power monitoring, overload protection, and output overvoltage protection, without the need for additional external components.

The TPS2378DDA supports dual power sources that can be selected via an external control signal. An internal Power Management Unit (PMU) enables the user to select the primary source by allowing full control of both power sources. When either source reaches its configured voltage, the PMU will automatically switch to the other source. The TPS2378DDA also provides integrated safety features, such as over-temperature, over-current and over-voltage protection.

The TPS2378DDA’s Power-over-Ethernet functionality is compliant with the IEEE 802.3 Ethernet standard and allows for wireless access to devices in power-constrained environments. The device is capable of delivering up to 30 watts of power and delivers PoE power over four pairs of twisted-pair wiring. The TPS2378DDA supports a wide range of input voltages, from -48V to 50V. Additionally, the device features an adjustable current limit setting, which can be used to optimize device’s power efficiency.

The TPS2378DDA is designed to provide a cost-effective solution for a wide range of applications that require multiple power sources, such as industrial automation, networking, security, and audio/video equipment. The device is capable of providing up to 15 amps of output current, with a maximum output voltage of 50V. The device is also capable of supporting sourcing and sinking of power from the same source, allowing it to meet the most demanding load requirements.

In terms of its working principle, the TPS2378DDA is designed to prioritize the input sources in order to ensure that the PoE power is provided when it is needed. The device incorporates a power-on reset circuit that enables it to activate the current source when both sources are enabled. It also includes an integrated voltage reference, over-current and temperature protection as additional safety features.

Overall, the Texas Instruments TPS2378DDA is an ideal choice for a variety of applications that require high power delivery from multiple sources. With its built-in safety features, the device offers a cost-effective and reliable solution for Power-over-Ethernet applications. The device is certified for use in accordance with the latest IEEE 802.3 Ethernet standard, making it an ideal choice for applications where both PoE and traditional AC/DC power sources are needed.

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