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參數(shù)資料
| 型號： | MIC2289-15YML |
| 廠商： | MICREL INC |
| 元件分類： | 顯示驅動器 |
| 英文描述： | 2mm 】 2mm White LED Driver with Internal Schottky Diode and OVP |
| 中文描述： | LED DISPLAY DRIVER, DSO8 |
| 封裝： | 2 X 2 MM, LEAD FREE, MLF-8 |
| 文件頁數(shù)： | 5/9頁 |
| 文件大?。?/td> | 88K |
| 代理商： | MIC2289-15YML |
August, 2004
5
M9999-081104
MIC2289
Functional Diagram
Micrel
Functional Description
The MIC2289 is a constant frequency, PWM current mode
boost regulator. The block diagram is shown above. The
MIC2289 is composed of an oscillator, slope compensation
ramp generator, current amplifier, g
m
error amplifier, PWM
generator, 500mA bipolar output transistor, and Schottky
rectifier 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 compen-
sation ramp generator. The current amplifier is used to
measure the switch current by amplifying the voltage signal
from the internal sense resistor. The output of the current
amplifier is summed with the output of the slope compensa-
tion ramp generator. This summed current-loop signal is fed
to one of the inputs of the PWM generator.
GND
V
REF
PWM
Generator
Ramp
Generator
1.2MHz
Oscillator
SW
EN
FB
OUT
VIN
95mV
g
m
OVP
Σ
MIC2289 Block Diagram
The g
m
error amplifier measures the LED current through the
external sense resistor and amplifies the error between the
detected signal and the 95mV reference voltage. The output
of the g
m
error amplifier 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:
I
LED
=
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.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2289-15YML TR | 功能描述:LED照明驅動器 2x2mm White LED Driver w/ 15V OVP (Lead Free) RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| MIC2289-15YML-TR | 功能描述:LED 驅動器 IC 1 輸出 DC DC 穩(wěn)壓器 升壓（升壓） 模擬，PWM 調(diào)光 750mA（開關） 8-MLF?（2x2） 制造商:microchip technology 系列:- 包裝:剪切帶（CT） 零件狀態(tài):停產(chǎn) 類型:DC DC 穩(wěn)壓器 拓撲:升壓（升壓） 內(nèi)部開關:是 輸出數(shù):1 電壓 - 供電（最低）:2.5V 電壓 -?供電（最高）:10V 電壓 - 輸出:15V 電流 - 輸出/通道:750mA（開關） 頻率:1.2MHz 調(diào)光:模擬，PWM 應用:背光 工作溫度:-40°C ~ 125°C （TJ） 安裝類型:表面貼裝 封裝/外殼:8-VFDFN 裸露焊盤，8-MLF? 供應商器件封裝:8-MLF?（2x2） 標準包裝:1 |
| MIC2289-24BML | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:2mm 】 2mm White LED Driver with Internal Schottky Diode and OVP |
| MIC2289-24BML TR | 功能描述:IC LED DRIVER WHITE BCKLGT 8-MLF RoHS:否 類別:集成電路 (IC) >> PMIC - LED 驅動器 系列:- 標準包裝:1 系列:- 恒定電流:- 恒定電壓:- 拓撲:PWM，切換式電容器（充電泵） 輸出數(shù):1 內(nèi)部驅動器:是 類型 - 主要:背光 類型 - 次要:白色 LED 頻率:642kHz 電源電壓:2.7 V ~ 5.5 V 輸出電壓:5V 安裝類型:表面貼裝 封裝/外殼:10-VFDFN 裸露焊盤 供應商設備封裝:10-VSON 包裝:剪切帶 (CT) 工作溫度:-30°C ~ 85°C 產(chǎn)品目錄頁面:1371 (CN2011-ZH PDF) 其它名稱:BD1603NUV-E2CT |
| MIC2289-24YD6 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:White LED Driver Internal Schottky Diode and OVP |
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