Linear Technology DC1626A Demo Manual page 4

DEMO MANUAL DC1626A
QUICK START PROCEDURE
95
90
85
80
75
0 5
LOAD CURRENT (A)
BOTH RAILS:
QTOP = RJK0305DPB
QBOTTOM = RJK0330DPB
L = VISHAY IHLP4040DZ-01 0.56μH
DCR = 1.7mΩ TYP , 1.8mΩ MAX
Figure 2. Efficiency Curves for the DC1626A-A
(DCR Sense) in FCM
95
90
85
80
75
0 5
LOAD CURRENT (A)
BOTH RAILS:
QTOP = RJK0305DPB
QBOTTOM = RJK0330DPB
L = WURTH 7443330068 0.68μH
DCR = 1.35mΩ ±10%
R = 2.5mΩ
SENSE
Figure 4. Efficiency Curves for the DC1626A-B
(R ) in FCM
SENSE
4
1.5V
1.2V
10 15 20
dc1626a F02
1.5V
1.2V
10 15 20
dc1626a F04
100
90
DCM
80
70
60
FCM
50
40
30
20
10
0
0.01 0.1 1
LOAD CURRENT (A)
BOTH RAILS:
QTOP = RJK0305DPB
QBOTTOM = RJK0330DPB
L = VISHAY IHLP4040DZ-01 0.56μH
DCR = 1.7mΩ TYP , 1.8mΩ MAX
Figure 3. Efficiency Curves for the DC1626A-A
(DCR Sense) in FCM and DCM.
100
90
DCM
80
70
60
FCM
50
40
30
20
10
0
0.01 0.1 1
LOAD CURRENT (A)
BOTH RAILS:
QTOP = RJK0305DPB
QBOTTOM = RJK0330DPB
L = WURTH 7443330068 0.68μH
DCR = 1.35mΩ ±10%
R = 2.5mΩ
SENSE
Figure 5. Efficiency Curves for the DC1626A-B
(R ) in FCM and DCM
SENSE
1.2V
1.5V
10 100
dc1626a F03
1.2V
1.5V
10 100
dc1626a F05
dc1626afa