收藏本站
8-String White LED Driver with
SMBus for LCD Panel Applications
FB Pin Maximum Voltage
The current through each FB_ pin is controlled only
during the step-up converter’s on-time. During the con-
verter’s off-time, the current sources are turned off. The
output voltage does not discharge and stays high. The
MAX17061A disables the FB current source to which
the string is shorted. In this case, the step-up convert-
er’s output voltage is always applied to the disabled FB
pin. The FB_ pin can withstand 45V.
PCB Layout Guidelines
Careful PCB layout is important for proper operation.
Use the following guidelines for good PCB layout:
1) Minimize the area of high current switching loop of
rectifier diode, internal MOSFET, and output capac-
itor to avoid excessive switching noise.
2) Connect high-current input and output components
with short and wide connections. The high-current
input loop goes from the positive terminal of the input
capacitor to the inductor, to the internal MOSFET,
then to the input capacitor’s negative terminal. The
high-current output loop is from the positive termi-
nal of the input capacitor to the inductor, to the rec-
tifier diode, to the positive terminal of the output
capacitors, reconnecting between the output
capacitor and input capacitor ground terminals.
Avoid using vias in the high-current paths. If vias
are unavoidable, use multiple vias in parallel to
reduce resistance and inductance.
3) Create a ground island (PGND) consisting of the
input and output capacitor ground and negative ter-
minal of the current-sense resistor. Connect all
these together with short, wide traces or a small
ground plane. Maximizing the width of the power-
ground traces improves efficiency and reduces out-
put-voltage ripple and noise spikes. Create an
analog ground island (AGND) consisting of the
overvoltage detection divider ground connection,
the ISET and FSET resistor connections, CCV
capacitor connections, and the device’s exposed
backside pad. Connect the AGND and PGND
islands by connecting the GND pins directly to the
exposed backside pad. Make no other connections
between these separate ground planes.
4) Place the overvoltage detection divider resistors as
close as possible to the OV pin. The divider’s cen-
ter trace should be kept short. Placing the resistors
far away causes the sensing trace to become
antennas that can pick up switching noise. Avoid
running the sensing traces near LX.
5) Place IN pin bypass capacitor as close as possible
to the device. The ground connection of the IN
bypass capacitor should be connected directly to
GND pins with a wide trace.
6) Minimize the size of the LX node while keeping it
wide and short. Keep the LX node away from the
feedback node and ground. If possible, avoid run-
ning the LX node from one side of the PCB to the
other. Use DC traces as shield if necessary.
Refer to the MAX17061A evaluation kit for an example
of proper board layout.
______________________________________________________________________________________
23
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
MAX17061ETI+T IC LED DRVR WHITE BCKLGT 28-TQFN
MAX17105ETG+T IC LED DRVR WHITE BCKLGT 24-TQFN
MAX17127ETP+ IC WLED DVR SIX STRING 20TQFN
MAX17149ETE+ IC LED DRVR 6CH STEP UP 16QFNEP
MAX17410EVKIT+ KIT EVAL FOR MAX17410 CTLR
MAX17605AUA+ IC MOSFET DRVR 4A DUAL 8UMAX
MAX1848ETA+T IC LED DRIVR WHITE BCKLGT 8-TDFN
MAX1912EUB+ IC LED DRVR WHITE BCKLGT 10-MSOP
相关代理商/技术参数
MAX17061AEVCMAXQU+ 功能描述:LED 照明开发工具 Evaluation Kit/Evaluation system for MAX17061A 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:
MAX17061AEVKIT+ 功能描述:LED 照明开发工具 MAX17061A 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:
MAX17061ETI+ 功能描述:LED照明驱动器 8-String White LED Driver w/SMBus 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
MAX17061ETI+T 功能描述:LED照明驱动器 8-String White LED Driver w/SMBus 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
MAX17061EVCMAXQU+ 功能描述:LED 照明开发工具 Evaluation Kit/Evaluation System for the MAX17061 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:
MAX17061EVKIT+ 功能描述:LED 照明开发工具 MAX17061 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:
MAX17062ETB+ 制造商:Maxim Integrated Products 功能描述: 制造商:Maxim Integrated Products 功能描述:TFT-LCD STEP-UP DC-DC CONVERTER - Rail/Tube
MAX17062ETB+T 功能描述:直流/直流开关转换器 TFT-LCD Step-Up DC/DC 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