Linear DC2033A Demo Manual page 5

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
Options
R RESISTANCE (25°C)
SENSE
Internal 20mΩ at I
LOAD
(16.5mΩ to 22.5mΩ
LT6110 22mΩ at I
LOAD
R (18.5mΩ to 24.5mΩ
SENSE
External 25mΩ at I
LOAD
R ±1%
EXT
External 5.4mΩ at I
LOAD
R ±15%
PCB
5.7mΩ at I
LOAD
±15%
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and Jumper
SENSE
JUMPERS JUMPERS
STANDARD 0Ω ULTRA-0Ω
= 1A, RJ1, RJ2 RJ3
= 3A,
= 1A, RJ4, RJ5 RJ6
= 1A, RJ7, RJ8 RJ9
= 10A,
Figure 5. DC1458A and DC2033A Connections
DEMO MANUAL DC2033A
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
the regulator board and connect the regulator's feedback pin
(FB or V ) to the DC2033A V
REF
the V and GND of the regulator board to the REGULATOR
OUT
(E1) and to the GND (E3) of the DC2033A respectively.
I
LOADMAX
Figure 5 shows Linear Technology's buck regulator demo
3A at 125°C
board, DC1458A, connected to a DC2033A, using an
external sense resistor, R
includes the LT3972, 5V at 3.5A buck regulator. Figure 6
6A at 70°C
shows the complete cable/wire compensation schematic.
5A at 90°C
NOTE: The LT3972 R2 and R3 feedback resistors are re-
20A at 25°C
10A at 90°C
moved from the DC1458A board and are on the DC2033A
board (R , R
FA
. Remove the feedback resistors from
REG
(E9). In addition, connect
FB
. The DC1458A demo board
EXT
and R ). The no-load LT3972 voltage is
FB G
dc2033af
5