- 您现在的位置：买卖IC网 > PDF目录19226 > MIC2287YD5 TR (Micrel Inc)IC LED DRIVR WHITE BCKLGT TSOT-5 PDF资料下载
参数资料
| 型号： | MIC2287YD5 TR |
| 厂商： | Micrel Inc |
| 文件页数： | 5/10页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR WHITE BCKLGT TSOT-5 |
| 标准包装： | 1 |
| 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-23-5 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： | 576-1728-6 |
MIC2287
Functional Diagram
Micrel, Inc.
VIN
FB
OVP*
EN
OVP*
SW
V REF
95mV
g m
PWM
Generator
S
1.2MHz
Oscillator
Ramp
Generator
GND
* OVP available on MLF TM package option only
MIC2287 Block Diagram
I LED =
FunctionalDescription
The MIC2287 is a constant frequency, PWM current mode
boost regulator. The block diagram is shown above. The
MIC2287 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 oscil-
lator 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 genera-
tor. 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 g m 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, maintain-
ing the constant frequency current-mode PWM control. The
LED is set by the feedback resistor:
95mv
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.
July 2005
5
M9999-070105
相关PDF资料 |
PDF描述 |
|---|---|
| EMC43DRYH-S734 | CONN EDGECARD 86POS DIP .100 SLD |
| HCC60DRTI | CONN EDGECARD 120PS DIP .100 SLD |
| TAJE477K006RNJ | CAP TANT 470UF 6.3V 10% 2917 |
| TAJD157M016H | CAP TANT 150UF 16V 20% 2917 |
| TPSD477M004R0045 | CAP TANT 470UF 4V 20% 2917 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2288 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:1A 1.2 MHZ PWM BOOST CONVERTER IN THIN SOT 23 AND 2 X MLF |
| MIC2288_05 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:1A 1.2MHz PWM Boost Converter in Thin SOT-23 and 2×2 MLF |
| MIC2288BD5 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:1A 1.2 MHZ PWM BOOST CONVERTER IN THIN SOT 23 AND 2 X MLF |
| MIC2288BD5 TR | 功能描述:IC REG BOOST ADJ 1A TSOT23-5 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:20 系列:SIMPLE SWITCHER® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:12V 输入电压:4 V ~ 60 V PWM 型:电压模式 频率 - 开关:52kHz 电流 - 输出:1A 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:16-DIP（0.300"，7.62mm） 包装:管件 供应商设备封装:16-DIP 其它名称:*LM2575HVN-12LM2575HVN-12 |
| MIC2288BML | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:1A 1.2MHz PWM Boost Converter in Thin SOT-23 and 2×2 MLF |
发布紧急采购，3分钟左右您将得到回复。