Analog Devices DC3018A, Руководство пользователя

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4
DEMO MANUAL DC3018A
Rev. 0
dc3018a CS01a
140k
22µF
×3
100k
V
OUT
1.2V
12.5A
6.8pF
22µF 22µF
0.1µF
SW
EN
AGND
RT
FB
MODE/SYNC
ITH
SSTT
PGOOD
0.22µF 0.1µF 0.1µF
1µF
0.22µF
15k
470pF
V
IN
V
IN
V
IN
V
IN
2.25V TO
5V
PGND
LTC3311S
100nH
Figure 3. Technique for Measuring Load Step Response
QUICK START PROCEDURE
CIRCUIT SCHEMATIC
Efficiency vs Load Current
1.2V, 12.5A Step-Down Converter
Load Transient Response Forced
Continuous Mode
3.3V
IN
TO 1.2V
OUT
LOADSTEP 2.5A TO 10A 1A/µs
20µs/DIV
V
SG_INPUT
2V/DIV
V
I_STEP
200mV/DIV
1.2V
V
OUT
20mV/DIV
dc3018a F03
V
IN
= 3.3V
V
OUT
= 1.2V
f = 2MHz
EFFICIENCY
POWER LOSS
I
LOAD
(A)
0 1 2 3 4 5 6 7 8 9 10 11 12 13
0
10
20
30
40
50
60
70
80
90
100
0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
3.2
3.6
4.0
EFFICIENCY (%)
POWER LOSS (W)
dc3018a CS01b