Linear Technology DC2180A Demo Manual page 3

Quick start proceDure
To avoid damage to the circuit board, do not over tighten the
lugs. A torque sufficient to fully compress the split washer
(roughly equivalent to 400 in-oz applied to the ¼-28 hex
nut) is sufficient to produce good electrical contact. Ap-
ply DeOxit as necessary to assure clean mating surfaces.
The fasteners are stainless steel and therefore subject to
galling; do not over tighten. A lithium- or molybdenum
disulfide-based thread lubricant is recommended for
repeated assembly and disassembly.
RTN current does not pass through DC2180A. A single
point connection to the RTN terminal of the load is all that
is necessary to deliver bias (<5mA) to the LTC4371 and
FAULTB LED.
fAuLTb LeD
A green LED (D1) extinguishes when ΔV
an indication of an open MOSFET or abnormally high
(>200A) load current.
DEMO MANUAL DC2180A
basic Test Setup
DAnger! HigH vOLTAge TeSTing SHALL be per-
fOrmeD by quALifieD perSOnneL OnLy . AS A SAfeTy
preCAuTiOn AT LeAST TwO peOpLe SHALL be preSenT
During HigH vOLTAge TeSTing.
Use a Thomas & Betts WT115 crimping tool to crimp the
lugs provided to 4 AWG welding cable. Do not mash or
solder the lugs. Connect two 48V, 50A power supplies
and a load as shown in Figure 1. Connect DC2180A's RTN
terminal to the load's RTN through a short hookup wire or
test lead. Apply power and adjust the load for 50A.
The load current will smoothly transition from one supply
to the other, as their output voltages are adjusted up and
down relative to one another. The supplies droop share
over a transition region whose width is proportional to
exceeds 200mV,
the equivalent supply resistance.
SD
dc2180af
3