4
DEMO MANUAL DC275
DC/DC CONVERTER
QUICK START GUIDE
Refer to Figure 2 for proper measurement equipment
setup and follow the procedure outlined below:
1. Connect the input power to the V
IN
and GND terminals
on the board using 12-gauge or heavier wire soldered
to the terminals. The input voltage is limited to
between 4.75V and 7V.
2. Connect an ammeter in series with the input supply to
measure input current.
3. Since this demo board operates from a low input
voltage and supplies high output current, it is essen-
tial that the input supply voltage be well regulated. If
the input power supply is equipped with remote
sense lines, connect SENSE
+
to the V
IN
terminal and
SENSE
–
to GND terminal on the board.
4. Connect either power resistors or an electronic load
to the V
OUT1
, V
OUT2
and GND terminals using
12-gauge or heavier wire, soldered to the terminals.
5. Connect an ammeter in series with each of the output
loads to measure output currents.
6. The SD1 and SD2 pins should be left floating for
normal operation and tied to GND for shutdown.
7. Connect a voltmeter across the V
IN
and GND termi-
nals to measure input voltage.
8. Connect a voltmeter across the V
OUT1
and GND
terminals and another across the V
OUT2
and GND
terminals to measure the output voltages.
9. For applications where the minimum load current is
greater than 1A, set jumper JP4 to the “Continuous”
position.
10. Set the desired output voltage (V
OUT1
) with jumpers
JP1 to JP3, as shown in Table 1.
11. After all connections are made, turn on the power and
verify that V
OUT1
and V
OUT2
are correct.
Table 1
POSITION
OUTPUT VOLTAGE
No Jumper
1.6V
JP1
1.8V
JP2
2.0V
JP3
2.5V
PWRGD1
BURST CONT
PWRGD2
FAULT
SD2
SD1
GND
JP2
JP1
GND
INPUT
SUPPLY
V
IN
LOAD
GND
DC275A-LTC1702CGN
DUAL OUTPUT BUCK REGULATORS
V
OUT1
V
OUT2
V
A
JP3
LOAD
V
A
V
A
Figure 2. Proper Measurement Setup
