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dc2442af
DEMO MANUAL DC2442A
QUICK START PROCEDURE (WITHOUT SOFTWARE)
DC2442A is easy to set up to evaluate the performance of
the LTC4282. Refer to Figure 1 for proper measurement
equipment setup and follow the procedure below.
WARNING:
The DC2442A is capable of operation in excess
of 200A. At this current and power level, there is a danger
of serious personal injury and equipment damage if proper
techniques are not used. All cabling between the power
supply and the load should be capable of handling the
current levels used.
Additionally, the high currents and fast transients can cause
unexpected voltage drops in cables connecting the test
equipment to the DC2442A due to parasitic resistance and
inductance. The cable drops may cause sneak paths for
the current via various cables and scope probes causing
unexplained ringing, distorted oscilloscope waveforms,
voltage and current spikes, and signals appearing to be
below ground.
A common sneak path for current is the third wire ground
used on power cords of test equipment in use. Using
ground lifting connectors at the wall outlet won’t neces-
sarily alleviate these effects since most equipment has
line-bypassing capacitors between the mains voltage and
local chassis ground. Isolating test equipment using line
isolation transformers with low primary to secondary
capacitance is recommended.
Another method to remove these artifacts is to use dif-
ferential scope probes to probe connections between the
signal to be observed and a local ground referenced to
the point being measured.
Also be careful to not allow an open ground from the
power supply or load to cause return current through the
grounds of the various devices connected to the demo
board. This can cause damage to the equipment as well
as cause a fire hazard.
The DC2442A is setup to operate in a 12V system at current
levels up to 200A. At 200A, the bypass channels MOSFETs
are dissipating only 500mW each. No additional airflow is
needed for continuous operation, the total temperature rise
of the board averaging around 70
°
C with no airflow. If the
MOSFET count is reduced, ensure that there is sufficient
airflow to manage thermal dissipation.
Figure 2. Demo Board Temperature at 73°C After 10
Minutes of Continuous Operation at 200A with No Airflow
Jumper Positions
JUMPER
NAME
POSITION
JP1
CLK
EXT
JP2
ON
INTV
CC
JP3
ADR0
NC
JP4
ADR1
NC
JP5
ADR2
NC
JP6
WRITE PROTECT
LOCK
