High-Efficiency, 40V Step-Up
Converters for 2 to 10 White LEDs
Functional Diagram
V CC
LX
EN
ENABLE
CONTROL
CIRCUITRY
CONTROL
LOGIC
DRIVER
CURRENT
LIMIT
GND
UVLO
1.25V
BANDGAP
REFERENCE
MINIMUM
t OFF ONE-SHOT
V LIM
REF
MINIMUM
t ON ONE-SHOT
BIAS
GENERATOR
ERROR
OV
COMPARATOR
FB
OV
COMPARATOR
128k ?
96k ?
110k ?
BRT
REF
MAX1553
MAX1554
67k ?
1.25V
SS
2.7V TO 5.5V
INPUT
C1
4.7 μ F
L1
47 μ H
TOKO A920CY-470M
V CC LX
D1
CMDSH2-3
C2
0.47 μ F
25V
R2
200k ?
2.7V TO 5.5V
INPUT
C1
10 μ F
L1
4.7 μ H
MURATA LQH32C
V CC LX
D1
CMDSH1-60M
C2
0.47 μ F
50V
R2
330k ?
ON
OFF
EN
OV
C4
4700pF
D2–D7
ON
OFF
EN
OV
C4
3300pF
MAX1553
R3
10k ?
WHITE
LEDs
MAX1553
R3
10k ?
D2–D10
WHITE
LEDs
PWM
OR
BRT
FB
PWM
OR
BRT
FB
DC CONTROL
C3
0.1 μ F
SS
GND
R1
10 ?
DC CONTROL
C3
0.1 μ F
SS
GND
R1
10 ?
Figure 1. Circuit with the MAX1553 Driving Six White LEDs
Figure 2. Circuit with the MAX1553 Driving Nine White LEDs at
Up to 15mA
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7
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相关代理商/技术参数
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MAX1555EZK+T 功能描述:电池管理 Dual USB/AC 1-Cell Li+ Battery Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel
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