sc4540 Semtech Corporation, sc4540 Datasheet - Page 6

• Manufacturer Part Number: sc4540
• Description: High Ei Ciency Boost Converter For Up To 10 Leds
• Manufacturer: Semtech Corporation

Typical Characteristics (continued)
V
OUT
I
V
OUT
V
IN
V
(100mV/div)
V
OUT
LX
1 0 0
(50mV/div)
V
LX
(10mA/div)
8 0
6 0
4 0
2 0
EN
(20V/div)
(20V/div)
(20V/div)
0
(5V/div)
0
2 0 0H z
Normalized I
3 2kH z
2 0
Typical Waveforms at V
5 0kH z
Start-Up Response
4 0
D u ty C y c le (m A )
BL
versus Duty Cycle
1μs/div
1ms/div
6 0
IN
= 7.2V
8 0
1 0 0
V
V
OUT
OUT
V
I
V
OUT
IN
V
IN
(100mV/div)
V
(100mV/div)
V
LX
(50mV/div)
LX
(50mV/div)
(10mA/div)
V
LX
(20V/div)
EN
(20V/div)
(20V/div)
(5V/div)
PWM Operation at 200Hz and 1% Duty Cycle
Typical Waveforms at V
Typical Waveforms at V
10μs/div
1μs/div
1μs/div
IN
IN
= 5.0V
= 12V
SC4540
6 6