DC1840C Analog Devices

DEMO MANUAL DC1840C DC1682B and DC1680B LTC4270/LTC4271 12-Port PSE with Digital Isolation DESCRIPTION Demonstration kit DC1840C is a 12-port Ethernet Alliance printouts. Other available supporting documents for the certified IEEE 802.3at Type 2 power sourcing equipment DC1840 are the LTC4270/LTC4271 Layout Guide and the (PSE) composed of a DC1682B daughter card and DC1680B LTC4271 PSE Demo Software Users Manual. mother board. The kit is used for evaluation of the LTC4270B The DC1682B has increased surge protection over the and LTC4271 PSE chipset. Up to 12 powered devices (PDs) DC1682A. The DC1680B uses discrete Ethernet transform- can be connected and powered from this system using a ers while the DC1680A has an integrated 12-port RJ45 jack. single power supply. A DC590 is connected to the DC1840 2 Design files for this circuit board are available. for I C interfacing with QuikEval. This demonstration All registered trademarks and trademarks are the property of their respective owners. manual provides a Quick Start Procedure, a DC1682 overview, a DC1680 overview, schematics, and layout BOARD PHOTO Rev E 1DEMO MANUAL DC1840C QUICK START PROCEDURE Demonstration kit DC1840C includes the DC1682 4. On the DC1680, connect a supply with the positive daughter card and DC1680 mother board. The kit is set rail to POS and negative rail to NEG (Figure 3). Use a up for evaluating the LTC4270/LTC4271. Follow the pro- power supply capable of sourcing the maximum load cedure below and refer to Figures 1 through 4 for proper expected (12 ports 850mA 10.2A). Ramp the supply equipment setup. up to 51V to 57V. 1. On the DC1682 set AUTO jumper JP1 to HI (Figure 1) 5. Connect up to 12 PDs to the DC1680, J4 (Figure 3). to enable AUTO pin mode. 6. The DC590 is optionally connected to the DC1680 con- 2. On the DC1682 set MID jumper JP2 to LO (Figure 1) nector J5 with a 14-pin ribbon cable (Figure 3). A GUI to disable midspan mode. for the LTC4270/LTC4271 is brought up by QuikEval for 2 I C interfacing from a PC (Figure 4). 3. Align pin 1 of the 34-pin male connector on the DC1682 with pin 1 of the 34-pin female connector on the DC1680 (Figure 2). Pin 12 is polarized to assist with the alignment. Carefully push the DC1682 straight down until the two 34-pin connectors are flush with each other. Rev E 2