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Highest Efficiency Supply for 2 to 6
Series WLEDs in a 2mm x 2mm TDFN Package
Typical Operating Characteristics (continued)
(Circuit of Figure 5, I LED = 24.75mA, V IN = V ON = 3.6V, C1 = 1μF, C2 = 1μF, T A = +25°C, unless otherwise noted.)
95
LED AND BOOST EFFICIENCY
vs. INPUT VOLTAGE
800
IN CURRENT (I IN )
vs. SUPPLY VOLTAGE
BOOST
700
MAX8901B
90
85
80
LED
600
500
400
300
MAX8901 A
75
70
6WLEDs,
INDUCTOR: TOKO A915AY-220M,
DIODE: CENTRAL SEMI CMDSH05-4
200
100
0
2
3
4
5
6
2
3
4
5
6
7
INPUT VOLTAGE (V)
SWITCHING WAVEFORMS
MAX8901A/B toc9
SUPPLY VOLTAGE (V)
INPUT OVERVOLTAGE
PROTECTION RESPONSE
MAX8901A/B toc10
V I
V LX
50mV/div
AC-COUPLED
10V/div
V IN
V OUT
5.4V
6.4V
1V/div
(AC-COUPLED)
10V/div
0V
0V
V OUT
100mV/div
AC-COUPLED
I LEDs
20mA/div
0mA
I LX
V ON
V OUT
I SUPPLY
I LEDs
1 μ s/div
STARTUP AND SHUTDOWN
RESPONSE (MAX8901A)
MAX8901A/B toc11
C2 = 0.1 μ F
10ms/div
100mA/div
0mA
2V/div
0V
10V/div
0V
100mA/div
0mA
20mA/div
0mA
V LX
V ON
V OUT
I SUPPLY
I LEDs
20ms/div
STARTUP AND SHUTDOWN
RESPONSE (MAX8901B)
MAX8901A/B toc12
10ms/div
20mA/div
0V
2V/div
0V
10V/div
0V
100mA/div
0mA
20mA/div
0mA
_______________________________________________________________________________________
5
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相关代理商/技术参数
MAX8901EVKIT+ 功能描述:LED 照明开发工具 Evaluation Kit for the MAX8901A and MAX8901B RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装:
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MAX8902AATA+T 功能描述:低压差稳压器 - LDO 500mA LDO Regulator RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20
MAX8902AATAT 制造商:MAXIM/DALLAS 功能描述:
MAX8902BATA/V+ 制造商:Maxim Integrated Products 功能描述:LOW-NOISE 500MA LDO REGULATORS IN A 2MM X 2MM TDFN PACKAGE - Rail/Tube
MAX8902BATA/V+T 功能描述:低压差稳压器 - LDO 150mA LDO Linear Regulator RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20
MAX8902BATA+ 制造商:Maxim Integrated Products 功能描述:LOW-NOISE 500MA LDO REGULATORS IN A 2MM X 2MM TDFN PACKAGE - Rail/Tube
MAX8902BATA+T 功能描述:低压差稳压器 - LDO 500mA LDO Regulator RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20