Техническая Спецификация для Linear Technology LTC4290B/LTC4271: (DC1680 + DC1842) 8-Port 25.5W Demo Kit (req DC590) DC1843A DC1843A

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dc1843af

DEMO MANUAL DC1843A

Demonstration kit DC1843A includes the DC1842A 
daughter card and DC1680A 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 (DC1843A Kit): Connector J1 on the DC1680A has 
four pegs blocking the unused last four pins to match the 
30-pin connector of the DC1842A. Dust caps block the four 
unused ports at each RJ45 connector on the DC1680A 
for the 8-Port.

1.  On the DC1842A set AUTO jumper JP1 to HI (Figure 1) 

to enable AUTO pin mode.

2. On the DC1842A set MID jumper JP2 to LO (Figure 1) 

to disable midspan mode.

3.  Align pin 1 of the 30-pin male connector on the DC1842A 

with pin 1 of the 30-pin female connector on the 
DC1680A (Figure 2). Pin 12 is polarized to assist with the 
alignment. Carefully push the DC1842A straight down 
until the two 30-pin connectors are flush with each other.

4.  On the DC1680A, 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 55V.

5. Connect up to 8 PDs to ports 1-8 at the DC1680A, J4 

(Figure 3).

6.  The DC590 is optionally connected to the DC1680A 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).