L1937 Datasheet, PDF (4/7 Pages) Unisonic Technologies – WHITE LED STEP-UP CONVERTER

UTC L1937
LINEAR INTEGRATED CIRCUIT
VIN
3V ~ 5V
CIN
1DŽF
L
22DŽH
D
VDC
DIMMING
VIN
SW
UTC LT1937
SHDN FB
GND
90k
5k
R1
4Ƹ
COUT
0.22DŽF
Three LED Efficiency
90
85
80
VIN=3V
75
VIN=3.6V
70
Li-Ion to Three White LEDs
65
60
0
5
10
15
20
LED CURRENT (mA)
VIN
3V ~ 5V
CIN
1DŽF
L
22DŽH
D
VDC
DIMMING
VIN
SW
SHDN FB
GND
90k
5k
R1
4Ƹ
85
COUT
0.22DŽF
80
75
70
Five LED Efficiency
VIN=3V
VIN=3.6V
Li-Ion to Five White LEDs


65
0
2
4
6
8
10
12
LOAD CURRENT (mA)
UTC UNISONIC TECHNOLOGIES CO., LTD. 4
QW-R103-021,A