3
dc1669af
DEMO MANUAL DC1669A
QUICK START PROCEDURE
Figure 2. Measured Supply Effi ciency at 12V
IN
and 18V
IN
V
OUT
100mV/DIV
I
OUT(STEP)
3.33A/DIV
50μs/DIV
DC1669A F03
V
IN
(V)
V
OUT
(V)
C
OUT
BULK
C
OUT
CERAMIC
OTHER
12
1.8
330μF/6.3V
POSCAP
2
×
100μF, 6.3V
C10 = 47pF
C19 = 330pF
Figure 3. Measured Load Transient Response
(7.5A to 15A Load Step)
Figure 4. Measured Thermal Capture
V
IN
(V)
V
OUT
(V)
I
OUT
(A)
AIRFLOW
AMBIENT (°C)
12
1.8
15
Natural
Convection
27
LOAD CURRENT (A)
0
65
EFFICIENCY (%)
70
75
80
85
95
2
4
6
8
10
DC1669 F02a
12
14
90
18V
IN
f
SW
= 500kHz
3.3V
OUT
2.5V
OUT
1.8V
OUT
1.5V
OUT
1.2V
OUT
1V
OUT
LOAD CURRENT (A)
0
65
EFFICIENCY (%)
70
75
80
85
95
2
4
6
8
10
DC1669 F02b
12
14
90
12V
IN
f
SW
= 500kHz
3.3V
OUT
2.5V
OUT
1.8V
OUT
1.5V
OUT
1.2V
OUT
1V
OUT
