Quick Start Procedure - Linear Technology DC1840A Demo Manual

DEMO MANUAL DC1840A

Quick start proceDure

Demonstration kit DC1840A includes the DC1682A
daughter card and DC1680A mother board. The kit is set
up for evaluating the LTC4270/LTC4271. Follow the pro-
cedure below and refer to Figures 1 through 4 for proper
equipment setup.
1. On the DC1682A set AUTO jumper JP1 to HI (Figure 1)
to enable AUTO pin mode.
2. On the DC1682A set MID jumper JP2 to LO (Figure 1)
to disable midspan mode.
3. Align pin 1 of the 34-pin male connector on the DC1682A
with pin 1 of the 34-pin female connector on the
DC1680A (Figure 2). Pin 12 is polarized to assist with the
2
Figure 1. DC1682A Backside. Setting AUTO and MID Jumpers
Figure 2. Inserting the DC1682A into J1 of the DC1680A
alignment. Carefully push the DC1682A straight down
until the two 34-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 (12 ports × 850mA ≥ 10.2A). Ramp the supply
up to 55V.
5. Connect up to 12 PDs to the DC1680A, J4 (Figure 3).
6. The DC590 is optionally connected to the DC1680A
connector J5 with a 14-pin ribbon cable (Figure 3). A
GUI for the LTC4270/LTC4271 is brought up by QuikEval
2
for I C interfacing from a PC (Figure 4).
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