DC1366B Analog Devices

DEMO MANUAL DC1366B LTC4266 IEEE 802.3at PoE Quad PSE Controller DESCRIPTION Demonstration circuit DC1366B features the LTC 4266, a The DC1366B is configured like a midspan PSE with two 2 quad network power controller with I C interface, designed RJ45 connectors for each port such that gigabit Ethernet for use in IEEE 802.3at compliant Power Sourcing Equip- data can pass through the board at full line rates while ment (PSE). Integrated into a tiny 5mm 7mm 38-pin DC power is injected by the LTC4266 on the OUT TO PD QFN package are four independent channels controlling side of the board. external N-channel power MOSFETs. Each port features: Often one of the most challenging aspects of designing a n Reliable 4-Point PD Detection PSE system is the power management software Analog Devices makes the job easier with the fully-featured n Selectable 1 or 2-Event Classification LTC4266 register set and a QuikEval GUI software ap- n Inrush Current Limiting plication. The GUI allows the user full and easy access to the LTC4266 register set with detailed contextual help info. n Extremely Fast Short-Circuit Protection with Program- mable Foldback Current Threshold LTC4266 example software is available only under a non- disclosure agreement (NDA). n Programmable Cutoff Current Threshold for Class Power Enforcement The DC1366B has increased surge protection and more compact Hot Swap MOSFETs over the DC1366A. The n Voltage and Current Readback DC1366B is Ethernet Alliance certified. n DC Disconnect Sensing Design files for this circuit board are available. All registered trademarks and trademarks are the property of their respective owners. DC1366B Rev B 1DEMO MANUAL DC1366B QUICK START PROCEDURE Figure 1 shows the basic setup. The LTC4266 requires 3. Connect the DC590 to the PC with a standard USB A-B two power supply rails: V (nominally 3.3V) and V cable. DD EE (nominally 54V). The V supply can be provided by a DD a. Verify the computer recognized the USB device. DC590 board or an external bench supply. (The first time the DC590 is connected the Hardware When running QuikEval on a Windows computer, the Wizard may ask for help to locate the driver. Direct DC590 is used to interface a USB port on the PC to the it to the location specified in the README.txt that 2 I C bus on the DC1366B. The DC590 also provides opto- came with the GUI software.) 2 isolation of the I C bus, and an isolated 3.3V supply to run b. Verify the ISO PWR LED on the DC590 is lit. the LTC4266 the user need only provide the V supply. EE 4. On the DC1366B board: Alternatively, the user can omit the DC590 and connect an 2 a. Set JP5 to the USB V position. I C master device to the DC1366B. If the DC590 is omitted DD then a bench power supply must provide V . DD b. Set JP3 to the TIE position. 2 For applications where I C control is not required, the c. Set JP4 (AUTO) to the HI position. LTC4266 features an AUTO mode allowing it to operate d. If midspan operation is desired set JP2 to HI, for completely autonomously. endpoint set to LO. Choose one of the setup procedures shown on the next 5. Connect the DC590 to the DC1366B with the 14-con- page, depending on whether or not the QuikEval GUI ap- ductor ribbon cable supplied with the DC1366B. Verify plication software is required. the V LED on the DC1366B is lit. DD Setup Procedure to Run the QuikEval GUI Software 6. Before connecting the main power supply to the DC1366B verify the voltage is between 51V and 57V, 1. Install the GUI software on the PC according to the and that the main supply is turned off. instructions in the README.txt file included with the GUI software. 7. Connect the main power supply to the DC1366B with two banana patch cords as shown in Figure 1. Verify 2. On the DC590: the polarity is correct before turning on the power a. Set both sides (ISO and SW) of JP5 to ON. positive goes to RTN and negative to V . EE b. Set JP6 to 3.3V. 8. Turn on the main power supply and verify the V LED EE on the DC1366B is lit. 9. Connect PDs to any of the ports on the OUT to PD side of the DC1366B and verify they turn on by the respective OUTn LED. 10. Launch QuikEval. Rev B 2