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MAX16840
LED Driver with Integrated MOSFET
for MR16 and Other 12V AC Input Lamps
D MIN = 1 ?
= 1 ?
18.66V × D MIN 2
L MIN =
The output voltage of the LED string is given by V LED . As
a first-order approximation, the LED voltage is assumed
constant. The duty cycle at the peak of the input voltage
is, therefore:
13.2V × 2 18.66V
V LED + 13.2V × 2 V LED + 18.66V
The percentage P-P ripple is typically selected in the 30%
to 60% range of the maximum input current. Assuming
a 60% P-P inductor-current ripple, the maximum inductor
current is given by:
I P-P = 1.3I IN
The minimum inductor value is given by:
0.6I IN × 300kHz
where the switching frequency is 300kHz. The saturation
current of the inductor should be higher than I P-P and the
minimum value of the inductor at I P-P should exceed L MIN .
Maxim Integrated
Output Diode (D1)
A Schottky diode must be used as rectifier diode D1 to
reduce power dissipation. The voltage rating of diode D1
must be greater than the maximum peak input voltage
plus the maximum output voltage. Choose a diode that
minimizes dissipation at temperatures in the +90 N C to
+100 N C range. The diode should be selected to minimize
reverse leakage at the maximum output voltage while
minimizing forward losses when the diode is conducting.
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maxim-ic.com/packages . Note that a
“+”, “#”, or “-” in the package code indicates RoHS status only.
Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
PACKAGE PACKAGE OUTLINE LAND
TYPE CODE NO. PATTERN NO.
11
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相关代理商/技术参数
MAX16841ASA+
功能描述:LED照明驱动器 Wide Input Offline w/Dimming
RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
MAX16841ASA+T
功能描述:LED照明驱动器 Wide Input Offline w/Dimming
RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
MAX16841BEVKIT#
功能描述:LED 照明开发工具 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:
MAX16841EVKIT#
功能描述:LED 照明开发工具 MAX16841 Eval Kit
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:
MAX16841EVKIT+
功能描述:LED 照明开发工具 MAX16841 Eval Kit
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:
MAX16842ASA+
功能描述:模数转换器 - ADC New RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32
MAX16842ASA+T
功能描述:模数转换器 - ADC New RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32
MAX1684EEE
功能描述:直流/直流开关转换器 14V 1A PWM Step-Down Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT