2
dc2117af
DEMO MANUAL DC2117A
Quick start proceDure
Demonstration circuit DC2117A is easy to set up to evalu-
ate the performance of the LTC3895EFE. Refer to Figure 1
for proper measurement equipment setup and follow the
procedure below:
NOTE.
When measuring 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 touching the probe tip directly across the V
IN
or V
OUT
and GND terminals or directly across relevant
capacitor. See Figure 2 for proper scope probe technique.
1. Place jumpers in the following positions:
JP1
ON
JP4
FCM
JP5
ON
JP8
OFF
2. With power off, connect the input power supply to V
IN
and GND.
3. Turn on the power at the input.
NOTE.
Make sure that the input voltage is higher than
14V and does not exceed 130V.
4. Check the output voltage. The output voltage should
be between 11.76V and 12.24V.
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.
NOTE.
If there is no output, temporarily disconnect the
load to make sure that the load is not set too high.
Figure 1. Proper Measurement Equipment Setup