Linear ANALOG DEVICES DC2155A-A, Руководство пользователя, Страница: 6 / 26

6
DEMO MANUAL
DC2155A-A/DC2155A-B
Rev. C
QUICK START PROCEDURE
Figure 5. Measuring Output Voltage Ripple
Measuring Efficiency
To accurately measure efficiency of any configuration, do
the following:
n
Set JP6 to OFF position to disable the pulse generator
circuits.
n
DC2155A-A version. Measure V
IN
across the input
ceramic capacitor (C7 for CH0, C21 for CH1). Measure
V
OUT
across the output ceramic capacitor (C10 for
CH0, C26 for CH1).
n
DC2155A-B version. Measure V
IN
across the input
ceramic capacitor C7. Measure V
OUT
across the output
ceramic capacitor C10.
Measuring Output Ripple Voltage
An accurate ripple measurement may be performed by
using the below configuration across C10/C26.
+ –
V
OUT
GND
C
OUT
(a) DC2155A-A: Efficiency at 12V
OUT
(b) DC2155A-A: Efficiency at 5V
OUT
LOAD CURRENT (A)
I
LOAD
= 0A to 12A
f
SW
= 150kHz
EXTV
CC
= 12V (TIED TO V
OUT
)
ONE OUTPUT RAIL IS
ENABLED AT A TIME.
0
EFFICIENCY (%)
10 6
DC2155 F06a
8 4 11 12 2 9 5 7 3 1
100
98
96
94
92
88
86
84
82
80
90
18V
IN
24V
IN
32V
IN
48V
IN
LOAD CURRENT (A)
0
EFFICIENCY (%)
10 6
DC2155 F06b
8 4 11 12 2 9 5 7 3 1
I
LOAD
= 0A to 12A
f
SW
= 150kHz
EXTV
CC
= 5V (TIED TO V
OUT
)
ONE OUTPUT RAIL IS
ENABLED AT A TIME.
18V
IN
24V
IN
32V
IN
48V
IN
100
98
96
94
92
88
86
84
82
80
90
Figure 6.