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| 型号： | NCL30100ASLDGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 7/27页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO SGL LAYER PWM DIM LED |
| 设计资源： | NCL30100 Schematic NCL30100 BOM NCL30100ASLDGEVB Gerber Files |
| 特色产品： | NCL30100 Fixed OFF-Time Buck LED Driver Controller |
| 标准包装： | 1 |
| 输出及类型： | 1，非隔离 |
| 特点： | 可调光 |
| 输入电压： | 12V |
| 已供物品： | 板 |
| 已用 IC / 零件： | NCL30100 |
| 其它名称： | NCL30100ASLDGEVBOS |
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NCL30100
APPLICATION INFORMATION
The NCL30100 implements a peak current mode control
scheme with a quasi ? fixed OFF time. An optional input
feedforward voltage control is provided to enhance
regulation response with widely varying input voltages.
Only a few external components are necessary to implement
the buck converter. The NCL30100 incorporates the
following features:
? Very Low Startup Current: The patented internal supply
block is specially designed to offer a very low current
consumption during startup.
? Negative Current Sensing: By sensing the total current,
this technique does not impact the MOSFET driving
voltage (V GS ) during switching. Furthermore, the
programming resistor together with the pin capacitance
forms a residual noise filter which blanks spurious
spikes. This approach also supports a flexible resistor
selection. Finally unlike a positive sensing approach,
there is virtually no power dissipation in the current
the switch and the inductor. This approach offers several
benefits over traditional positive current sensing.
? Maximum peak voltage across the current sense resistor
is user controlled and can be optimized by changing the
value of the shift resistor.
? The gate drive capability is improved because the
current sense resistor is located out of the gate driver
loop and does not deteriorate the switch on and also
switch off gate drive amplitude.
? Natural leading edge blanking is filter switching noise
at FET turn ? in
? The CS pin is not exposed to negative voltage, which
could induce a parasitic substrate current within the IC
and distort the surrounding internal circuitry.
The current sensing circuit is shown in Figure 15.
sense resistor thus improving efficiency.
? Controller architecture supports high brightness LED
drive current requirements: Selection of the external
n ? channel MOSFET can be easily optimized based on
IVC
Input Voltage
Regulator
operation voltage, drive current and size giving the
designer flexibility to easily make design tradeoffs.
? Typical $ 5.5% Current Regulation: The I CS pin offers
$ 5.5% from 0 to 85 ° C (+5.5% ? 9.5% across ? 40 ° C to
125 ° C) accuracy of the current typically, so the LED
peak current is precisely controlled
? No output capacitor is needed: By operating the
controller in continuous conduction mode, it is possible
to eliminate the bulky output filter capacitor.
The following section describes in detail each of the control
blocks
V shift
CS
R shift
R CS
V CS
12.5 ? 50 m A
To Latch
GND
I primary
Current Sensing Block
The NCL30100 utilizes a technique called negative
current sensing which is used to set the peak current through
http://onsemi.com
7
Figure 15. Primary Current Sensing
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCL30100SNT1G | 功能描述:LED照明驱动器 LED DRIVER CONTROLLER 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 |
| NCL30105 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Constant Off Time PWM Current-Mode Controller for LED Applications |
| NCL30105DR2G | 功能描述:LED照明驱动器 Flexible Dimmable Buck LED Driver Cont 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 |
| NCL30105GEVB | 功能描述:LED 照明开发工具 80V 350 MA BUCK LED Driver 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: |
| NCL30160 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:1.0A Constant-Current Buck Regulator for Driving High Power LEDs |
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