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参数资料
| 型号： | MIC2291YD5 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： | 1 |
| 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： | 标准包装 |
| 工作温度： | -40°C ~ 125°C |
| 产品目录页面： | 1082 (CN2011-ZH PDF) |
| 其它名称： | 576-1077-6 |
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 |
|---|---|
| MIC2293-15YML TR | IC LED DRIVER WHITE BCKLGT 8-MLF |
| MIC2293C-34YML TR | IC LED DRIVER WHITE BCKLGT 8-MLF |
| MIC2297-42YML TR | IC LED DRIVR WHITE BCKLGT 10-MLF |
| MIC2298-15YML TR | IC LED DRIVER HIGH BRIGHT 12-MLF |
| MIC2299-15YML TR | IC LED DRIVR WHITE BCKLGT 12-MLF |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| MIC2292_11 | 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 |
| MIC2292-15BML | 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 |
| MIC2292-15BML TR | 功能描述:IC LED DRIVER WHITE BCKLGT 8-MLF RoHS:否 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:1 系列:- 恒定电流:- 恒定电压:- 拓扑:PWM，切换式电容器（充电泵） 输出数:1 内部驱动器:是 类型 - 主要:背光 类型 - 次要:白色 LED 频率:642kHz 电源电压:2.7 V ~ 5.5 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-VFDFN 裸露焊盘 供应商设备封装:10-VSON 包装:剪切带 (CT) 工作温度:-30°C ~ 85°C 产品目录页面:1371 (CN2011-ZH PDF) 其它名称:BD1603NUV-E2CT |
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