SC443
Typical Characteristics (continued)
Start UP by Vin
VOUT
Test condition: 5Vin , 3*10 LED,
30mA@per channel, 25 C
VOUT
1V/DIV
Shutdown by Vin
SS SS
0.5V/DIV
VIN
Comp
10V/DIV
10V/DIV
VIN
Comp
0.5V/DIV
SS
0.5V/DIV
0.5V/DIV
1V/DIV
Comp
VOUT
Time(5ms/DIV)
Condition: VIN=5V, Load=30mA x3 string, 10LEDs per string
Start up and Shutdown by EN
Time(0.1ms/DIV)
Condition: VIN=12V, Load=30mA x3 string, 10LEDs per string
Start up and Shutdown by PWM
10V/DIV
VIN
10V/DIV
2V/DIV
VIN
SS
VOUT
6V/DIV
VOUT
1V/DIV
EN
6V/DIV
1V/DIV
SS
0.7V/DIV
PWM
Time(0.1s/DIV)
Condition: VIN=12V, Load=30mA x3 string, 10LEDs per string
Main Power Switching Waveform
Time(0.1ms/DIV)
Condition: VIN=12V, Load=30mA x3 string, 10LEDs per string
LED OPEN
50mV/DIV
VOUT
IL
5V/DIV
1V/DIV
VOUT
SS
200mA/DIV
5V/DIV
1V/DIV
VIN
IO3
10V/DIV
Time(1us/DIV)
SW
Time(20ms/DIV)
Condition: VIN=4.5V, Load=30mA x3 string, 10LEDs per string
Condition: VIN=12V, Load=30mA x3 string, 10LEDs per string
? 2009 Semtech Corp.
www.semtech.com
7
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