Linear Technology DC1889A Demo Manual page 3

Quick start proceDure
12V CCM Efficiency vs Load Current
IN
95
90
85
80
75
0
1
LOAD CURRENT (A)
V
OUT
50mV/DIV
I
OUT(STEP)
2A/DIV
V (V) V (V)
IN OUT
12 1.8 1 × 100µF/6.3V
1 × 22µF/6.3V
1 × 47µF/6.3V
Figure 3. Measured Load Transient Response (2A to 4A Load Step)
5V
3.3V
2.5V
1.8V
1.5V
1.2V
1V
2 3 4
Figure 2. Measured Supply Efficiency at 12V
C
OUT
+
+
DEMO MANUAL DC1889A
5V
IN
95
90
OUT
OUT
OUT
85
OUT
OUT
OUT
OUT
80
75
0
and 5V
IN
V
OUT
10mV/DIV
V (V) V
IN OUT
12
Figure 4. Measured V
CCM Efficiency vs Load Current
2 3
1
LOAD CURRENT (A)
IN
(V) i (A) C
OUT OUT
+
1.8 4 1 × 100µF/6.3V
+
1 × 22µF/6.3V
1 × 47µF/6.3V
Ripple (20MHz)
OUT
3.3V
OUT
2.5V
OUT
1.8V
OUT
1.5V
OUT
1.2V
OUT
1V
OUT
4
dc1889af
3