- 您现在的位置：买卖IC网 > PDF目录20751 > MIC2291BD5 TR (Micrel Inc)IC LED DRIVER PHOTO FLASH TSOT-5 PDF资料下载
参数资料
| 型号： | MIC2291BD5 TR |
| 厂商： | Micrel Inc |
| 文件页数： | 6/10页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER PHOTO FLASH TSOT-5 |
| 标准包装： | 3,000 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 闪灯/白光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 1.05MHz ~ 1.35MHz |
| 电源电压： | 2.5 V ~ 10 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-5 细型，TSOT-23-5 |
| 供应商设备封装： | TSOT-23-5 |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 125°C |
| 其它名称： | MIC2291BD5TR |
Micrel, Inc.
Functional Diagram
MIC2291
VIN
FB
OVP*
EN
OVP*
SW
V REF
95mV
g m
1.2MHz
Oscillator
PWM
Generator
Ramp
Generator
GND
* OVP available on MLF ? package option only
Figure 1. MIC2291 Block Diagram
I LED =
Functional Description
The MIC2291 is a constant frequency, PWM current
mode boost regulator. The block diagram is shown
above. The MIC2291 is composed of an oscillator, slope
compensation ramp generator, current ampli ? er, g m error
ampli ? er, PWM generator, and a 500mA bipolar output
transistor. The oscillator generates a 1.2MHz clock. The
clock’s two functions are to trigger the PWM generator
that turns on the output transistor and to reset the slope
compensation ramp generator. The current ampli ? er is
used to measure the switch cur-rent by amplifying the
voltage signal from the internal sense resistor. The
output of the current ampli ? er is summed with the output
of the slope compensation ramp generator. This
summed current-loop signal is fed to one of the inputs of
the PWM generator.
The g m error ampli ? er measures the LED current through
the external sense resistor and ampli ? es the error
between the detected signal and the 95mV reference
voltage. The output of the gm error ampli ? er provides the
voltage-loop signal that is fed to the other input of the
PWM generator. When the current-loop signal exceeds
the voltage-loop signal, the PWM generator turns off the
bipolar output transistor. The next clock period initiates
the next switching cycle, maintaining the constant
frequency current-mode PWM control. The LED is set by
the feedback resistor:
95mW
R FB
The Enable pin shuts down the output switching and
disables control circuitry to reduce input current-to-
leakage levels. Enable pin input current is zero at zero
volts.
May 2007
6
M9999-051507
相关PDF资料 |
PDF描述 |
|---|---|
| RMM30DTAN | CONN EDGECARD 60POS R/A .156 SLD |
| RMM30DTAH | CONN EDGECARD 60POS R/A .156 SLD |
| SQCSVA100JAT1A | CAP CER 10PF 250V 5% 0603 |
| GBC05DRYS-S734 | CONN EDGECARD 10POS DIP .100 SLD |
| RMM30DTAD | CONN EDGECARD 60POS R/A .156 SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2291YD5 | 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述: 制造商:Micrel Inc 功能描述: |
| MIC2291YD5 TR | 功能描述:LED照明驱动器 Photo Flash LED Driver (Lead Free) 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 |
| MIC2291YD5-TR | 功能描述:LED 驱动器 IC 1 输出 DC DC 稳压器 升压（升压） 模拟，PWM 调光 1.2A（开关） TSOT-23-5 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:有效 类型:DC DC 稳压器 拓扑:升压（升压） 内部开关:是 输出数:1 电压 - 供电（最低）:2.5V 电压 -?供电（最高）:10V 电压 - 输出:- 电流 - 输出/通道:1.2A（开关） 频率:1.2MHz 调光:模拟，PWM 应用:照相机闪光灯 工作温度:-40°C ~ 125°C （TJ） 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 供应商器件封装:TSOT-23-5 标准包装:1 |
| MIC2292 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:High Frequency PWM White LED Drivers with Internal Schottky Diode and OVP |
| MIC2292_05 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:High Frequency PWM White LED Drivers with Internal Schottky Diode and OVP |
发布紧急采购，3分钟左右您将得到回复。