CAT4134
TYPICAL CHARACTERISTICS
VIN = 3.6V, FLASH = VIN, C
IN
= 4.7µF, C
OUT
= 10µF, L = 22µH with 2 LEDs at 100mA, T
AMB
= 25ºC, unless
otherwise specified.
LED Current Regulation (100mA load)
2.0
LED CURRENT CHANGE [%]
LED CURRENT CHANGE [%]
LED Current Regulation (200mA load, Flash)
2.0
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
2.5
3.0
3.5
4.0
4.5
INPUT VOLTAGE [V]
2 LEDs
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
2.5
3.0
3.5
4.0
4.5
INPUT VOLTAGE [V]
2 LEDs
1 LED
Current Gain vs. RFLASH
CURRENT GAIN (Iout / Iflash) .
1900
LED Current Regulation (100mA load, Flash)
2.0
LED CURRENT CHANGE [%]
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
2.5
3.0
3.5
4.0
4.5
INPUT VOLTAGE [V]
1850
1800
1750
1700
1650
1600
0
2 LEDs
VIN= 3.6V
2 LEDs at 100mA
50
100
150
Rflash [kohm]
200
Efficiency vs. Output Current (Flash mode)
90
EFFICIENCY (%) .
Efficiency vs. Input Voltage (Flash mode)
90
EFFICIENCY (%) .
80
70
60
2 LEDs at 100mA
50
40
80
70
60
50
40
0
50
100
150
200
250
TOTAL LED CURRENT [mA]
VIN = 3.6V
2 LEDs
2.5
3.0
3.5
4.0
4.5
5.0
INPUT VOLTAGE [V]
Doc. No. 5021 Rev. A
4
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice.
CATALYST [ CATALYST SEMICONDUCTOR ]
