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SC4541
Typical Characteristics (continued)
Conditions: 5V IN , 20mA ,6 LEDs in series, C IN /C OUT =1μF, L=10μH
Start up By Vin
Shut
Shut Down
5Vin, Start-up — by V IN
Test condition: LEDs=6S1P, R1=10 Ω , SC4541(1120)
VIN
VIN
(2.5V/div)
Test condition: 5Vin, LEDs=6S1P, R1=10 Ω , SC4541(1120)
VIN
(2.5V/div)
VOUT
(5V/div)
IL
VOUT
IL
VOUT
(5V/div)
IL
(0.2A/div)
VIN
VOUT
IL
(0.2A/div)
SW
VSW
(10V/div)
Time (2mS/div)
VSW
(10V/div)
Start up By PWM
Time (5mS/div)
SW
Mail Pow
Test condition: 5Vin, LEDs=6S1P, R1=10 Ω , SC4541(1120)
5Vin, — by R1=10
Test condition: Start-up LEDs=6S1P, PWM Ω ,
PWM Dimming, 0.1% Duty Cycle
300Hz SC4541(1120), PWM Dimming 300Hz, 0.1% duty.
Main Power Switching
VOUT
(5V/div)
IL
(0.3A/div)
VSW
(10V/div)
VOUT
IL
SW
VIN
(1V/div)
VOUT
(50mV/div)
IL
(0.2A/div)
VIN
VOUT
IL
PWM
(3V/div)
Time (0.1S/div)
EN
VSW
(5V/div)
Time (0.5μS/div)
SW
Test condition: 5Vin to 12Vin, LEDs=6S1P,
R1=10 Ω , SC4541(1120)
VIN Fluctuation — Rising
5VIN to 12VIN
VIN
VIN Fluctuation - Rising Fluctuation — Falling
5VIN
12VIN to Test condition: 5Vin to 12Vin, LEDs=6S1P,
R1=10 Ω , SC4541(1120)
VIN Fluc
VIN
(5V/div)
VIN
VIN
(5V/div)
VIN
VOUT
(1V/div)
VSW
(10V/div)
Time (2μS/div)
VOUT
SW
VOUT
(1V/div)
VSW
(10V/div)
Time (20μS/div)
VOUT
SW
7
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