Quick Start Procedure - Linear Technology DC2110A Demo Manual

DEMO MANUAL DC2110A

Quick start proceDure

Demonstration circuit 2110A is easy to set up to evalu-
ate the performance of the LT8631. Refer to Figure 3 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
or V and GND terminals. See Figure 4 for the proper
OUT
scope technique.
1. Place JP1 on GND position.
2. With power off, connect the input power supply to V
and GND. If the EMI/EMC performance is not important,
the input EMI filter can be bypassed by connecting the
input power supply to V
3. With power off, connect loads from V
Detector: +Peak
Polarity: Vertical
50
45
40
35
30
25
20
15
10
5
0
-5
0 100
Detector: +Peak
Polarity: Horizontal
50
45
40
35
30
25
20
15
10
5 5
0 0
-5 -5
0 100
Figure 2. LT8631 Demo Circuit DC2110A EMI Performance in CISPR25 Radiated Emission Test
(14V Input from V
2
and GND.
IN
to GND.
OUT
200 300 400
Frequency (MHz)
200 300 400
Frequency (MHz)
Turret Pin, I = 1A)
EMI OUT
4. Turn on the power at the input.
Make sure that the input voltage does not exceed 100V.
5. Check for the proper output voltages (V
NOTE. If there is no output, temporarily disconnect the
load to make sure that the load is not set too high or is
shorted.
6. Once the proper output voltage is established, adjust
IN
the load within the operating ranges and observe the
output voltage regulation, ripple voltage, efficiency and
other parameters.
7. An external clock can be added to the SYNC terminal
EMI
when SYNC function is used (JP1 on the SYNC posi-
tion). Please ensure that the chosen RT sets the LT8631
switching frequency to 10% below the lowest SYNC
frequency. See the data sheet Synchronization section
for details.
500 600 700 800
500 600 700
OUT
Data
Class 5
Peak
900 1000
Data
Class 5
Peak
800 900 1000
= 5V).
dc2110af