el1848 Intersil Corporation, el1848 Datasheet - Page 6

• Manufacturer Part Number: el1848
• Description: White Led Step-up Regulator
• Manufacturer: Intersil Corporation

Typical Performance Curves
All performance curves and waveforms are taken with C
series; unless otherwise specified.
4.7µF
0.1µF
V
V
V
CTRL
CTRL
V
CTRL
V
4.7µF
0.1µF
V
4.7µF
0.1µF
IN
IN
IN
FIGURE 7A. 2 LEGS OF 2 LEDs IN A SERIES
FIGURE 8A. 2 LEGS OF 3 LEDs IN A SERIES
FIGURE 9A. 3 LEGS OF 2 LEDs IN A SERIES
8
2
1
VIN
CNTL
COMP
8
2
1
8
2
1
15µH
VIN
CNTL
COMP
VIN
CNTL
COMP
L
PGND
VOUT
SGND
33µH
33µH
CS
L
LX
L
PGND
VOUT
SGND
PGND
VOUT
SGND
CS
4
3
7
5
6
LX
CS
LX
6
BAT54HT1
4
3
7
5
6
4
3
7
5
6
BAT54HT1
BAT54HT1
5:
(Continued)
5:
5:
5:
1
= 4.7µF, C
5:
5:
5:
1µF
1µF
1µF
EL1848
FIGURE 7.
FIGURE 8.
FIGURE 9.
2
= 1µF, C
3
= 0.1µF, L = 33µF, V
90
85
80
75
70
90
85
80
75
70
95
90
85
80
75
70
10
10
15
2 LEGS OF 2 LEDs IN A SERIES
2 LEGS OF 3 LEDs IN A SERIES
3 LEGS OF 2 LEDs IN A SERIES
L=SUMIDA CMD13D13-33µH
L=SUMIDA CMD13D13-15µH
L=COILCRAFT LPO1704-333CM
FIGURE 7B. EFFICIENCY vs I
FIGURE 8B. EFFICIENCY vs I
FIGURE 9B. EFFICIENCY vs I
20
20
IN
35
= 3.3V, V
30
30
I
I
I
O
O
O
CNTL
55
(mA)
(mA)
(mA)
= 1V, R
40
40
V
V
IN
IN
V
V
V
V
IN
IN
75
=4.2V
=2.7V
IN
IN
1
=4.2V
=2.7V
=2.7V
50
O
50
O
=4.2V
O
= 5:, 3 LEDs in a
60
60
95