Quick Start Procedure - Linear Technology Analog Devices DC2814A-A Demo Manual

DEMO MANUAL DC2814A-A

QUICK START PROCEDURE

Demonstration circuit 2814A-A is easy to set up to
evaluate the performance of the LT8210. Refer to the
following procedure:
1. With power off, connect the input power supply to V
(8V to 40V) and GND (input return).
2. Connect the 8V to 16V output load between V
GND.
3. Connect the DVMs to the input and the output.
4. Turn on the input power supply and then check for the
proper output voltages. V
16V, depending on the input voltage (see Figure 4).
5. Once the proper output voltages are established, adjust
the loads within the operating range and observe
Figure 1. Measuring Output Voltage Ripple
100
95
90
85
80
BOOST-BUCK
75
BOOST
70
65
60
5 10
Figure 3. Efficiency vs V
2
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should be between 8V to
OUT
+ –
C
OUT
V GND
OUT
PASS-THRU
BUCK
BUCK-BOOST
I = 0.5A
OUT
I = 1.0A
OUT
I = 3.0A
OUT
15 20 25 30 35 40
INPUT VOLTAGE (V)
EFFICIENCY VS V
IN
DC2814aa F03
IN
the output voltage regulation, ripple voltage and
other parameters.
6. After the part starts, the input voltage can be reduced
to as low as 3.5V.
IN
7. The input voltage may be raised up to 80V for short
and periods of time.
OUT
Note: When measuring the output or input voltage rip-
ple, do not use the long ground lead on the oscilloscope
probe. See Figure 1 for the proper scope probe technique.
Short, stiff leads need to be soldered to the (+) and (–)
terminals of an output capacitor. The probe's ground ring
needs to touch the (–) lead and the probe tip needs to
touch the (+) lead.
20
17
14
11
8
DC2814aa F01
5
5
Figure 2. Output Voltage vs Input Voltage
100
90
80
70
60
50
40
30
20
10
0.01
V
OUT
10 15 20 25 30 35
INPUT VOLTAGE (V)
DC2814aa F02
6V (BOOST)
IN
8V (BOOST-BUCK)
IN
12V (PASS-THRU)
IN
16V (BUCK-BOOST)
IN
40V (BUCK)
IN
0.1 1
OUTPUT CURRENT (A)
EFFICIENCY VS I
OUT
DC2814aa F04
Figure 4. Efficiency vs I
OUT
40
5
Rev. 0