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dc1667afa
DEMO MANUAL DC1667A
QUICK START PROCEDURE
Figure 1. Proper Equipment Measurement Setup
Demonstration circuit DC1667A is easy to set up to evaluate
the performance of the LTC3600. Please refer to Figure 1
for proper measurement equipment setup and follow the
procedure below:
1. Place jumpers in the following positions for a typical
1.2V output application:
JP2
JP7
JP8
JP9
JP10
1.2V
COMP
PGOOD
RUN
MODE/SYNC
1.2V
EXT
DIS
OFF
CCM
2. With power off, connect the input power supply, load
and meters as shown in Figure 1. Preset the load to 0A
and V
IN
supply to 5V.
3. Turn on the power supply at the input. Measure and
make sure the input voltage is 5V. Turn on the circuit
by inserting the shunt in header JP9 to the ON position.
The output voltage should be 1.215V ± 2% (1.19V to
1.24V).
4. Once the proper output voltage is established, adjust the
load within the operating range and observe the output
voltage regulation, output voltage ripple, efficiency and
other parameters. Refer to Figure 2 for proper input/
output voltage ripple measurement.
5. To select other output voltages, LTC3600 has to be shut
down by putting RUN pin jumper to the OFF position or
turning off the input supply. After the IC is shut down,
move the shunt to other output voltage selections, such
as 1.8V or 3.3V, and repeat tests 1 through 4. The output
voltage tolerance should remain at V
OUT
± 2%.
V
IN
4.5V TO 15V
+
–
+
–
+
–
+
–
+
–
V
OUT
LOAD (0A TO 1.5A)
DC1667A F01
INPUT OR OUTPUT CAPACITOR
Figure 2. Scope Probe Placements for Measuring Input or Output Ripple
