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
= 5Ω, 3 LEDs in a
series; unless otherwise specified.
V
IN
4.7µF
L
15µH
1µF
90
8
4
EFFICIENCY (%)
85
V
IN
=2.7V
80
75
5Ω
5Ω
5Ω
70
15
L=SUMIDA CMD13D13-15µH
35
55
I
O
(mA)
75
95
BAT54HT1
3 LEGS OF 3 LEDs IN A SERIES
95
V
IN
=4.2V
VIN
LX
VOUT
CS
V
CTRL
2
1
0.1µF
CNTL PGND
COMP SGND
3
7
5
6
FIGURE 10A. 3 LEGS OF 3 LEDs IN A SERIES
FIGURE 10.
FIGURE 10B. EFFICIENCY vs I
O
1
POWER DISSIPATION (W)
0.9
JEDEC JESD51-7 HIGH EFFECTIVE
THERMAL CONDUCTIVITY TEST BOARD
POWER DISSIPATION (W)
0.6
0.5
JEDEC JESD51-3 LOW EFFECTIVE
THERMAL CONDUCTIVITY TEST BOARD
0.8 870mW
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
25
50
MSOP8/10
θ
JA
=115°C/W
486mW
0.4
0.3
0.2
0.1
0
0
25
50
MSOP8/10
θ
JA
=206°C/W
75 85
100
125
75 85
100
125
AMBIENT TEMPERATURE (°C)
AMBIENT TEMPERATURE (°C)
FIGURE 11. PACKAGE POWER DISSIPATION vs AMBIENT
TEMPERATURE
FIGURE 12. PACKAGE POWER DISSIPATION vs AMBIENT
TEMPERATURE
7
INTERSIL [ INTERSIL CORPORATION ]
