Linear DC2033A Demo Manual page 3

Quick start setup
Setting Up the DC2033A for Wire Compensation
Testing
The DC2033A default circuit uses the LT6110 internal
20mΩ sense resistor (R
0Ω RJ1, RJ2 and RJ3 are installed with 0Ω jumpers.
The RJ1 and RJ2 are standard 0Ω jumpers and con-
nect the LT6110 amplifier across the internal R
The RJ1 and RJ2 resistance is not a concern as the
current flowing through them is very small (the resis-
tance variation of standard 0Ω resistors is 20mΩ to
100mΩ). However, a standard 0Ω jumper must not be
used in the path of the load current because the jumper's
I • R drop adds an error term to a wire drop compensation
design (for example the I • R drop of a 50mΩ jumper for
2A is 100mV). The RJ3 jumper is ultra-0Ω, with less than
1mΩ and rated for 30A at 70°C. The RJ3 jumper can be
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REGULATOR
E1
5V POWER
GND
SUPPLY
E3
E1 TO E5
WIRE JUMPER
R
100
E5
V
OUT1
V − V
OUT1 OUT2
=
I
IOUT
R
OUT
I • R + V
LOAD SENSE OS
I =
IOUT
R
IN1
= 100
R
OUT
= 402
R
IN1
TYPICAL V = 100µV
OS
R = 20mΩ, ±15%
SENSE
Figure 4. DC2033A Quick Setup Circuit and Equations
) and is configured with
SENSE
DEMO MANUAL DC2033A
I I
LOAD
1A
C2
0.1µF
RJ1
0
R
IN1
402
+
+IN V
R
SENSE
I
IOUT
+ –
RJ10
OUT
LT6110
0
I
OUT
–
I
V
E6 MON
V
OUT2
E7
IMON
3× I
IOUT
RMON
100
EB
removed and re-installed as RJ6 or RJ9, to configure the
DC2033A with an LT6110 and an external R
alternative to an ultra-0Ω jumper install two 0.25 inch
length of 18AWG solid copper wires in parallel for up to
20A I
LOAD
The R
IN1
. output current (I
SENSE
The I
IOUT
tors and boosts the regulator's output voltage (V
V voltage increases directly with the load current and
REG
cancels the wire's I • R drop (V
A DC2033A has 0805 size pads for installing a switching
regulator's feedback resistors (R
quiescent current switching regulator has 10µA or less
current flowing through the feedback divider and requires
5 LOAD
LOAD
RJ3
E2
1A
0Ω
E4
GND
RJ2
0
R1
1k
RS –IN
DC2033 F04
).
resistor and the V voltage set the LT6110
SENSE
) for regulator output voltage control.
IOUT
current connects to the regulator feedback resis-
DROP
FA
(for an
SENSE
). The
REG
) to the remote load.
, R and R ). A low
FB G
dc2033af
3