SC440A Datasheet, PDF (7/21 Pages) Semtech Corporation – High Effi ciency Integrated Driver for 6-Strings of 30mA LEDs

SC440A
Typical Characteristics (continued)
Start up
VIN
5V/DIV
SS
2V/DIV
VOUT
20V/DIV
IO6
1V/DIV
Time ( 10ms/DIV)
Conditions: VIN = 5V, Load = 30mA
x 6 strings, 8 LEDs per string
VIN
5V/DIV
SS
2V/DIV
EN
1V/DIV
Shut down
Time ( 200ms/DIV)
Conditions: VIN = 5V, Load = 30mA
x 6 strings, 8 LEDs per string
Main Power Switching Waveform
Main Power Switching Waveform
SW
10V/DIV
SW
10V/DIV
VOUT(AC)
50mV/DIV
VOUT(AC)
50mV/DIV
Time ( 0.5us/DIV)
Conditions: VIN = 5V, Load = 30mA
x 6 strings, 8 LEDs per string
Time ( 0.5us/DIV)
Conditions: VIN = 12V, Load =
30mA x 6 strings, 8 LEDs per string
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