參數(shù)資料
型號: CAT4237
英文描述: High Voltage CMOS Boost White LED Driver
中文描述: 高電壓的CMOS升壓白光LED驅(qū)動器
文件頁數(shù): 6/13頁
文件大?。?/td> 533K
代理商: CAT4237
CAT4237
2005 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
6 of 13
Doc. No. 5013, Rev. A
Typical Characteristics
V
IN
= 3.6V, C
IN
= 4.7uF, C
OUT
= 0.22μF, L = 33μH, with 8 LEDs at 20mA, T
AMB
=25oC, unless otherwise specified.
LED Current vs. Input Voltage (8 LEDS)
0
5
10
15
20
25
30
35
2.5
3.0
3.5
4.0
4.5
5.0
INPUT VOLTAGE [V]
L
R
FB
= 10
R
FB
= 15
R
FB
= 20
LED Current Regulation (20mA)
-1.0%
-0.5%
0.0%
0.5%
1.0%
3.0
3.3
3.6
3.9
4.2
4.5
4.8
INPUT VOLTAGE [V]
C
8 LED Efficiency vs. Load Current
65
70
75
80
85
90
5
10
15
20
25
30
LED CURRENT [mA]
E
VIN = 3.6V
VIN = 4.2V
8 LEDs
VOUT ~ 27V at 20mA
L = 33uH
8 LED Efficiency vs. Input Voltage
65
70
75
80
85
90
3.0
3.5
INPUT VOLTAGE [V]
4.0
4.5
5.0
E
15mA
20mA
8 LEDs
VOUT ~ 27V at 20mA
L = 33uH
7 LED Efficiency vs. Load Current
65
70
75
80
85
90
5
10
15
20
25
30
LED CURRENT [mA]
E
VIN = 3.6V
VIN = 4.2V
7 LEDs
VOUT ~ 23V at 20mA
L = 33uH
6 LED Efficiency vs. Load Current
65
70
75
80
85
90
5
10
15
20
25
30
LED CURRENT [mA]
E
VIN = 3.6V
VIN = 4.2V
6 LEDs
VOUT ~ 20V at 20mA
L = 33uH
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