NCP1090GEVB, NCP1094GEVB Power-over-Ethernet PD Interface Evaluation Board User s Manual www.onsemi.com Introduction EVAL BOARD USERS MANUAL The NCP1090GEVB and NCP1094GEVB evaluation boards are designed to showcase the features of the NCP109x series of Power-over-Ethernet interfaces. The boards are designed as splitter interfaces, taking a PoE-enabled port as input and offering the power to a separate connector, while passing through the data to another Ethernet port. The schematics, gerber files and BOM of these boards are available through our website (www.onsemi.com) Basic Circuit Description The evaluation boards consist of different sections that will be described in detail in the next paragraphs. First, we will discuss the input section, including selection of the correct connectors, magnetics and the termination for a Power-over-Ethernet enabled connection. In the next Figure 1. NCP1090GEVB Photo section we will explain the operation of the NCP109x, the detection and classification process, and how to configure the NCP109x for the correct power class. Finally, we will explain how to use the UVLO support (for NCP1091 and NCP1093) or auxiliary support (for NCP1092 and NCP1094). Table 1. ELECTRICAL CHARACTERISTICS NCP1090, NCP1091, NCP1093, NCP1092 NCP1094 Input Voltage, PoE 37 V 57 V Input Current, PoE 500 mA 680 mA Auxiliary Input Voltage 10.8 V 57 V Auxiliary Input Current 0 5 A Figure 2. NCP1094GEVB Photo Semiconductor Components Industries, LLC, 2012 1 Publication Order Number: March, 2020 Rev. 1 EVBUM2156/DNCP1090GEVB, NCP1094GEVB INPUT SECTION Ethernet Connectors, Magnetics and Termination Output Connector Auxiliary Power Connector Ethernet Connector (out) PoweroverEthernet Connector (in) Figure 3. Connection Diagram The NCP109x evaluation boards have 2 RJ45 connectors. output connector is connected to a proper One connector is used as the input connector and supports Power-over-Ethernet PSE, the PD detection will fail without Power-over-Ethernet. The power from this connector is split damaging the board, and no power will be applied. When off to the NCP109x while the Ethernet data is passed through power is applied across the pairs of this second connector to the other RJ45 connector. Please note that this second without negotiation, the board will burn out the termination connector will not support Power-over-Ethernet. When the resistors. Data Pair Data Pair Data Pair Data Pair Data Pair Data Pair Data Pair Data Pair Power Powered Sourcing Device Equipment (PD) (PSE) Figure 4. Ethernet Connection with PoweroverEthernet Ethernet connections are double isolated, which means IEEE802.3-af standard and 600 mA for the IEEE802.3-at the data passes through a signal transformer on both on the standard) without high losses. It is recommended to choose Power Supply Equipment (PSE) side as well as on the magnetics that include common- mode chokes to reduce Powered Device (PD) side. In the case that the port must electromagnetic emissions. When board space is critical, it support Power-over-Ethernet, specific signal transformers can be interesting to choose connectors with build-in must be selected. First, the signal transformers must have a magnetics (MagJack). These connectors also integrate the central tap to access the common mode voltage of each pair, termination of the Ethernet line. Contact your magnetics as these are the carriers for the PoE power. Second, care must manufacturer for more information on magnetics suitable be taken to select transformers that can support the dc for PoE. common mode current required (up to 350 mA for the www.onsemi.com 2