2
dc1428af
DEMO MANUAL DC1428A
QUICK START PROCEDURE
Demonstration circuit 1428A is easy to set up to evaluate
the performance of the LT3645. Refer to Figures 1 and 2
for proper measurement equipment setup and follow the
procedure below:
To measure the input or output voltage ripple, care must
be taken to avoid a long ground lead on the oscilloscope
probe. Measure the input or output voltage ripple by touch-
ing the probe tip directly across the V
IN
or V
OUT
and GND
terminals. See Figure 2 for proper scope probe technique.
1. Place jumpers in the following position:
JP1
ON
JP2
ON
2. With power off, connect the input power supply to V
IN
and GND. Apply 5V to input and check for the proper
output voltages.
NOTE: If there is no output, temporarily disconnect the
load to make sure that the load is not set too high.
Once the proper output voltage is established, adjust the
load within the operating range and observe the output
voltage regulation, ripple voltage, efficiency and other
parameters.
LOAD CURRENT (mA)
0
50
EFFICIENCY (%)
60
70
80
90
100
200
300
400
500
V
IN
= 7V
V
IN
= 12V
V
IN
= 24V
Efficiency V
OUT
= 3.3V
