3
dc1523af
DEMO MANUAL DC1523A
QUICK START PROCEDURE
V
IN
(V)
5
8
10
14
20
30
DC1523A F02
6
4
10
15
25
35
40
2
0
12
CURRENT (A)
I
OUT
I
IN
V
IN
(V)
0
EFFICIENCY (%)
POWER LOSS (W)
92
96
40
DC1523A F03
88
84
10
20
30
5
15
25
35
100
90
94
86
98
4
6
2
0
8
3
5
1
7
EFFICIENCY
POWER LOSS
Figure 2. Input Current at Full Load (12V at 5A Out)
Figure 4. Output Ripple Voltage at 24V
IN
(Top), 12V
IN
(Middle),
6V
IN
(Bottom). Measured Across C
OUT1
, BW = 20MHz, 100mV/Div
Figure 3. Efficiency and Power Loss at Full Load. The Power
Loss is Highest in Boost Mode Due to the High Inductor Current,
and Drops as Input Voltage Increases. Switching Losses Again
Increase when V
IN
> V
OUT
. All Four MOSFETs are Switching in
Buck-Boost Mode and This Shows Up as a Small Increase in
Losses When V
IN
= 11V to 15.5V
LOAD (A)
0
EFFICIENCY (%)
94
96
98
4
DC1523 F06
92
90
88
1
2
3
5
6V
9V
12V
18V
24V
30V
36V
LOAD (A)
0
14
12
10
8
6
4
2
0
3
5
DC1523A F07
1
2
4
6
V
OUT
(V)
Figure 5. Load Transient Response
Figure 6. Efficiency at Various Input Voltages
Figure 7. Output Current Limit. (V
IN
= 12V. The Easiest Way to Do
This Test is with an Active Load in Voltage Mode)
