SC4541 Datasheet, PDF (7/19 Pages) Semtech Corporation – High Frequency LED Driver with Integrated Schottky and Simple Interconnect

SC4541
Typical Characteristics (continued)
Start up By Vin ^{Conditions: 5V}IN^{, 20mA ,6 LEDs in series, C}IN^/COUT^{=1µF, L=10µH}
Shut
Test condition: 5^SV^tin^a, ^rL^tE^-D^us^p=6^— S1P^b, R^y1^V=1I0NΩ, SC4541(1120)
Test condition: 5Vin^S, L^hE^uD^ts=^D6S^o1^wP,ⁿR1=10Ω, SC4541(1120)
VIN
VIN
(2.5V/div)
VIN
(2.5V/div)
VOUT
VOUT
(5V/div)
VIN
VOUT
VOUT
IL
(5V/div)
IL
(0.2A/div)
IL
IL
(0.2A/div)
VSW
(10V/div)
Time (2mS/div)
Test conditSiotna:r5tV-iun,pLE—Ds=b6yS1PPW, R1M=10Ω,
300^SH^Cz ⁴P⁵W⁴M¹⁽D¹i¹m²m⁰⁾i^,n^Pg,^W0.^M1%^DD^imut^my Cⁱⁿy^gcle^{300Hz, 0.1% duty.}
VOUT
(5V/div)
IL
(0.3A/div)
VSW
(10V/div)
SW
VSW
(10V/div)
Start up By PWM
Time (5mS/div)
SW
Mail Pow
Test conditio^Mn: ^a5Vⁱⁿin,^PL^oED^ws^e=6^rS^S1P^w, ⁱR^t1^c=^h10ⁱⁿΩ^g, SC4541(1120)
VOUT
IL
VIN
(1V/div)
VOUT
(50mV/div)
IL
(0.2A/div)
VIN
VOUT
IL
SW
PWM
VSW
(3V/div)
EN
(5V/div)
SW
Time (0.1S/div)
Time (0.5μS/div)
VIN Fluctuation - Rising
VIN Fluctuation — Rising
VIN Fluctuation — Falling
5VIN to 1^TR2^e1V^s=IN^t1c0o_Ω^{n,dSitCio4n5:451V(1in12t0o)12Vin, LEDs=6S1P,}
12VIN to^T5^eV^sIN^{t condition: 5Vin to 12Vin, LEDs=6S1P,}
R1=10Ω, SC4541(1120)
VIN Fluc
VIN
(5V/div)
VIN
VIN
(5V/div)
VIN
VOUT
(1V/div)
VOUT
VOUT
(1V/div)
VOUT
VSW
VSW
(10V/div)
SW
(10V/div)
SW
Time (2μS/div)
Time (20μS/div)
7