EL7513
Typical Performance Curves (Continued)
All performance curves and waveforms are taken with C 1 = 4.7μF, C 2 = 1μF, C 3 = 0.1μF, L = 33μF, V IN = 3.3V, V CNTL = 1V, R 1 = 5 Ω , 4 LEDs in a
series; unless otherwise specified.
L
BAT54HT1
V IN
4.7μF
33μH
1μF
90
4 LEDs IN A SERIES
V IN = 4.2V
8
VIN
LX
4
85
VOUT
3
80
V IN = 3.3V
V IN = 2.7V
CS
7
V CTRL
2
1
CNTL PGND
COMP SGND
5
6
5 Ω
75
70
L = COILCRAFT LPO1704-333CM
5
10
15
20
25
30
0.1μF
LED CURRENT (mA)
FIGURE 7A. 4 LEDs IN A SERIES
BAT54HT1
L
FIGURE 7.
FIGURE 7B. EFFICIENCY vs I O
V IN
4.7μF
33μH
1μF
90
2 LEGS OF 2 LEDs IN A SERIES
V IN = 4.2V
8
VIN
LX
4
85
V IN = 2.7V
VOUT
3
80
V CTRL
2
1
CS
CNTL PGND
COMP SGND
7
5
6
5 Ω
5 Ω
75
70
L = COILCRAFT LPO1704-333CM
0.1μF
10
20
30
40
50
60
I O (mA)
FIGURE 8A. 2 LEGS OF 2 LEDs IN A SERIES
BAT54HT1
L
FIGURE 8.
FIGURE 8B. EFFICIENCY vs I O
V IN
4.7μF
33μH
1μF
90
2 LEGS OF 3 LEDs IN A SERIES
V IN = 4.2V
8
VIN
LX
4
85
V IN = 2.7V
VOUT
3
80
V CTRL
2
1
CS
CNTL PGND
COMP SGND
7
5
6
5 Ω
5 Ω
75
70
L = SUMIDA CMD13D13-33μH
0.1μF
10
20
30
40
50
60
I O (mA)
FIGURE 9A. 2 LEGS OF 3 LEDs IN A SERIES
6
FIGURE 9.
FIGURE 9B. EFFICIENCY vs I O
FN7112.5
December 22, 2008
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