LTC4271 datasheet(2/28 Pages) LINER

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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-pinconnectoroftheDC1842B.Dustcapsblockthefour

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. Alignpin1ofthe30-pinmaleconnectorontheDC1842B

with pin 1 of the 30-pin female connector on the

DC1680B(Figure2).Pin12ispolarizedtoassistwiththe

alignment. Carefully push the DC1842B straight down

untilthetwo30-pinconnectorsareflushwitheachother.

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. TheDC590isoptionallyconnectedtotheDC1680Bcon-

nector J5 with a 14-pin ribbon cable (Figure 3). A GUI

for the LTC4290B/LTC4271 is brought up by QuikEval

for I2C interfacing from a PC (Figure 4).

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