5
dc2033af
DEMO MANUAL DC2033A
applications
DC2033A Application Options
The DC2033A is designed to be used with a regulator
board and copper wire. On board jumper pads and turrets
configure an LT6110 circuit using 0Ω jumpers and provide
for wired connections to a regulator board. Figures 6, 7
and 8 show typical DC2033 application circuit options.
Table 2. DC2033A Current Sense Resistor, R
SENSE
and Jumper
Options
R
SENSE
RESISTANCE (25°C)
JUMPERS
STANDARD 0Ω
JUMPERS
ULTRA-0Ω
I
LOADMAX
Internal
20mΩ at I
LOAD
= 1A,
(16.5mΩ to 22.5mΩ
RJ1, RJ2
RJ3
3A at 125°C
LT6110
R
SENSE
22mΩ at I
LOAD
= 3A,
(18.5mΩ to 24.5mΩ
External
R
EXT
25mΩ at I
LOAD
= 1A,
±1%
RJ4, RJ5
RJ6
6A at 70°C
5A at 90°C
External
R
PCB
5.4mΩ at I
LOAD
= 1A,
±15%
5.7mΩ at I
LOAD
= 10A,
±15%
RJ7, RJ8
RJ9
20A at 25°C
10A at 90°C
The DC2033A with a Regulator Demo Board
A DC2033A board can be configured and connected to a
regulator demo board for a complete cable/wire drop com-
pensation system evaluation. Typically a regulator demo
board includes a feedback resistor divider that sets the
output voltage V
REG
. Remove the feedback resistors from
the regulator board and connect the regulator’s feedback pin
(FB or V
REF
) to the DC2033A V
FB
(E9). In addition, connect
the V
OUT
and GND of the regulator board to the REGULATOR
(E1) and to the GND (E3) of the DC2033A respectively.
Figure 5 shows Linear Technology’s buck regulator demo
board, DC1458A, connected to a DC2033A, using an
external sense resistor, R
EXT
. The DC1458A demo board
includes the LT3972, 5V at 3.5A buck regulator. Figure 6
shows the complete cable/wire compensation schematic.
NOTE:
The LT3972 R2 and R3 feedback resistors are re-
moved from the DC1458A board and are on the DC2033A
board (R
FA
, R
FB
and R
G
). The no-load LT3972 voltage is
Figure 5. DC1458A and DC2033A Connections
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