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参数资料
| 型号： | MIC2289C-34YD6 TR |
| 厂商： | Micrel Inc |
| 文件页数： | 5/9页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR WHITE BCKLGT TSOT-6 |
| 标准包装： | 3,000 |
| 恒定电流： | 是 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光，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-23-6 细型，TSOT-23-6 |
| 供应商设备封装： | TSOT-23-6 |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 125°C |
| 其它名称： | MIC2289C-34YD6TR MIC2289C-34YD6TR-ND |
Micrel, Inc.
Functional Diagram
MIC2289C
VIN
FB
EN
OUT
OVP
SW
V REF
95mV
g m
PWM
Generator
S
1.2MHz
Oscillator
Ramp
Generator
GND
MIC2289C Block Diagram
I LED =
Functional Description
The MIC2289C is a constant frequency, PWM current
mode boost regulator. The block diagram is shown
above. The MIC2289C is composed of an oscillator,
slope compensation ramp generator, current ampli ? er,
gm error ampli ? er, PWM generator, 500mA bipolar
output transistor, and Schottky recti ? er diode. 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 current 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 gm 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.
August 2007
5
M9999-081507-B
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2289C-34YML | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:White LED Driver Internal Schottky Diode and OVP |
| MIC2289CBD5 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:White LED Driver Internal Schottky Diode and OVP |
| MIC2289CYD5 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:White LED Driver Internal Schottky Diode and OVP |
| MIC2290 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:2mm 】 2mm PWM Boost Regulator with Internal Schotty Diode |
| MIC2290_07 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:2mm 】 2mm PWM Boost Regulator with Internal Schotty Diode |
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