Linear Technology DC1680B, Руководство пользователя

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dc1843bfa
DEMO MANUAL DC1843B
QUICK START PROCEDURE
Figure 1. DC1842 Backside. Setting AUTO and MID Jumpers
Figure 2. Inserting the DC1842 into J1 of the DC1680
Demonstration kit DC1843B includes the DC1842B
daughter card and DC1680B motherboard. The kit is set
up for evaluating the LTC4290B/LTC4271. Follow the pro-
cedure below and refer to Figures 1 through 4 for proper
equipment setup.
NOTE (DC1843B Kit): Connector J1 on the DC1680B has
four pegs blocking the unused last four pins to match the
30-pin connector of the DC1842B. Dust caps block the four
unused ports at each RJ45 connector on the DC1680B
for the 8-Port.
1. On the DC1842B set AUTO jumper JP1 to HI (Figure 1)
to enable AUTO pin mode.
2. On the DC1842B set MID jumper JP2 to LO (Figure 1)
to disable midspan mode.
3. Align pin 1 of the 30-pin male connector on the DC1842B
with pin 1 of the 30-pin female connector on the
DC1680B (Figure 2). Pin 12 is polarized to assist with the
alignment. Carefully push the DC1842B straight down
until the two 30-pin connectors are flush with each other.
4. On the DC1680B, connect a supply with the positive
rail to POS and negative rail to NEG (Figure 3). Use a
power supply capable of sourcing the maximum load
expected (8 ports
×
850mA ≥ 6.8A). Ramp the supply
up to 51V to 57V.
5. Connect up to 8 PDs to ports 1-8 at the DC1680B, J4
(Figure 3).
6. The DC590 is optionally connected to the DC1680B con-
nector J5 with a 14-pin ribbon cable (Figure 3). A GUI
for the LTC4290B/LTC4271 is brought up by QuikEval
for I
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C interfacing from a PC (Figure 4).