el1848 Intersil Corporation, el1848 Datasheet - Page 8

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

Waveforms
All performance curves and waveforms are taken with C
series; unless otherwise specified.
V
V
CNTL
'V
I
CNTL
'V
V
LED
I
FIGURE 17. DISCONTINUOUS CONDUCTION MODE
V
LED
LX
I
V
IN
IN
IN
I
O
L
O
V
CTRL
FIGURE 15. TRANSIENT RESPONSE
=0.34V, I
FIGURE 13. START-UP
LED
=5mA
10ms/DIV
20ms/DIV
1µs/DIV
8
1
2V/DIV
50mA/DIV
1V/DIV
10mA/DIV
10mV/DIV
100mA/DIV
10V/DIV
50mV/DIV
2V
1V
14.2V
12.9V
30mA
15mA
= 4.7µF, C
EL1848
2
= 1µF, C
3
V
FIGURE 18. OVER VOLTAGE PROTECTION (LED
= 0.1µF, L = 33µF, V
CNTL
I
'V
'V
LED
V
I
LX
IN
IN
I
O
L
FIGURE 16. CONTINUOUS CONDUCTION MODE
C
I
LED
3
=4700pF
=15mA
DISCONNECTED)
FIGURE 14. SHUT-DOWN
IN
= 3.3V, V
0.1ms/DIV
1µs/DIV
CNTL
= 1V, R
1
= 5:, 4 LEDs in a
V
V
O
COMP
50mA/DIV
1V/DIV
10mA/DIV
10mV/DIV
100mA/DIV
10V/DIV
50mV/DIV
(5V/DIV)
(1V/DIV)