- 您现在的位置：买卖IC网 > Datasheet目录995 > NCL30100ASLDGEVB (ON Semiconductor)BOARD DEMO SGL LAYER PWM DIM LED Datasheet资料下载
参数资料
| 型号： | NCL30100ASLDGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 8/27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 |
第1页第2页第3页第4页第5页第6页第7页当前第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页
NCL30100
Once the external MOSFET is switched on, the inductor
current starts to flow through the sense resistor R CS . The
current creates a voltage drop V CS on the resistor R CS , which
is negative with respect to GND. Since the comparator
connected to CS pin requires a positive voltage, a voltage
From Input Voltage
Compensation Block
VOffset
V shift is developed across the resistor R shift by a current
source which level ? shifts the negative voltage V CS . The
level ? shift current is in the range from 12.5 to 50 m A
depending on the optional input voltage compensation loop
control block signal (see more details in the input voltage
compensation section). The peak inductor current is equal
to:
CT
CT
50 m A
VOffset to VDD
To Latch’s Set Input
To Latch’s Output
I pk +
I CS @ R shift * V th
R CS
(eq. 1)
To achieve the best I pk precision, higher values of I CS
should be used. The Equation 1 shows the higher drop on
R CS reduces the influence of the V th tolerance. Vth is the
comparator threshold which is nominally 38 mV.
A typical CS pin voltage waveform for continuous
condition mode is shown in Figure 16.
GND
Figure 17. OFF Time Control
During the switch ? on time, the C T capacitor is kept
discharged by an internal switch. As soon as the latch output
V
I shift = 50 m A
I shift = 12.5 m A
changes to a low state, the I source is enabled and the voltage
across C T starts to ramp ? up until its value reaches the
threshold given by the V offset . The current injected into IVC
can change this threshold. The IVC operation will be
discussed in the next section.
V
VDD
0
Switch
t
CT pin
Voltage
I VC Goes Up
I VC Goes Down
Turn on
Voffset
Figure 16. CS Pin Voltage
I1
I2
I3
0
Figure 16 also shows the effect of the inductor current
t off ? min
t
based on the range of control possible via the IVC input.
OFF Time Control
The internal current source, together with an external
capacitor, controls the switch ? off time. In addition, the
optional IVC control signal can modulate the off time based
on input line voltage conditions. This block is illustrated in
Figure 17.
Figure 18. CT Pin Voltage
The voltage that can be observed on C T pin is shown in
Figure 18. The bold line shows the minimum IVC current
when the off time is at its minimum. The amount of current
injected into the IVC input can increase the off time by
changing the turn off comparator switching threshold. I1, I2,
http://onsemi.com
8
相关PDF资料 |
PDF描述 |
|---|---|
| NCL30105GEVB | BOARD EVAL 80V 350 FOR LED DRV |
| NCP1013LEDGEVB | BOARD EVAL 5W UNIV LED DRIVER |
| NCP1028LEDGEVB | EVAL BOARD FOR NCP1028LEDG |
| NCP1216AFORWGEVB | BOARD EVAL NCP1216A 35W |
| NCP1351LEDGEVB | EVAL BOARD FOR NCP1351LEDG |
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 |
发布紧急采购，3分钟左右您将得到回复。