
EL1848
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 ? , 3 LEDs in a
series; unless otherwise specified.
V IN
L
15μH
BAT54HT1
95
3 LEGS OF 3 LEDs IN A SERIES
4.7μF
1μF
90
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 ?
5 ?
5 ?
75
70
15
L=SUMIDA CMD13D13-15μH
35 55
75
95
0.1μF
I O (mA)
FIGURE 10A. 3 LEGS OF 3 LEDs IN A SERIES
FIGURE 10.
FIGURE 10B. EFFICIENCY vs I O
1
JEDEC JESD51-7 HIGH EFFECTIVE
THERMAL CONDUCTIVITY TEST BOARD
0.6
JEDEC JESD51-3 LOW EFFECTIVE
THERMAL CONDUCTIVITY TEST BOARD
0.9
0.8 870mW
0.7
0.6
MSOP8/10
θ JA =115°C/W
0.5
0.4
486mW
MSOP8/10
θ JA =206°C/W
0.5
0.4
0.3
0.2
0.1
0.3
0.2
0.1
0
0
25
50
75 85
100
125
0
0
25
50
75 85
100
125
AMBIENT TEMPERATURE (°C)
FIGURE 11. PACKAGE POWER DISSIPATION vs AMBIENT
TEMPERATURE
7
AMBIENT TEMPERATURE (°C)
FIGURE 12. PACKAGE POWER DISSIPATION vs AMBIENT
TEMPERATURE