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參數(shù)資料
| 型號(hào)： | MIC2287-24BML |
| 廠(chǎng)商： | MICREL INC |
| 元件分類(lèi)： | 顯示驅(qū)動(dòng)器 |
| 英文描述： | Replaced by PTH05060W : |
| 中文描述： | LED DISPLAY DRIVER, DSO8 |
| 封裝： | 2 X 2 MM, MLF-8 |
| 文件頁(yè)數(shù)： | 5/10頁(yè) |
| 文件大?。?/td> | 111K |
| 代理商： | MIC2287-24BML |
August 2004
5
M0510-081104
MIC2287
Functional Diagram
Micrel
Functional Description
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 amplifier, g
m
error amplifier, 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 transis-
tor and to reset the slope compensation 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 compensation 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
OVP*
VIN
95mV
*
OVP available on MLF
TM
package option only
g
m
OVP*
Σ
MIC2287 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.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MIC2287-34BML | Replaced by PTH05060W : |
| MIC2288YD5 | 1A 1.2 MHZ PWM BOOST CONVERTER IN THIN SOT 23 AND 2 X MLF |
| MIC2288BD5 | 1A 1.2 MHZ PWM BOOST CONVERTER IN THIN SOT 23 AND 2 X MLF |
| MIC2288 | Replaced by PTH05060W : 2.5VOUT 8A 5V/3.3V-INPUT ADJUSTABLE ISR WITH SHORT-CIRCUIT PROTECTION 14-SIP MODULE -40 TO 85 |
| MIC2288BML | Replaced by PTH05060W : |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2287-24BML TR | 功能描述:IC LED DRIVER WHITE BCKLGT 8-MLF RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - LED 驅(qū)動(dòng)器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 恒定電流:- 恒定電壓:- 拓?fù)?PWM，切換式電容器（充電泵） 輸出數(shù):1 內(nèi)部驅(qū)動(dòng)器:是 類(lèi)型 - 主要:背光 類(lèi)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(lèi)型:表面貼裝 封裝/外殼:10-VFDFN 裸露焊盤(pán) 供應(yīng)商設(shè)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(yè)面:1371 (CN2011-ZH PDF) 其它名稱(chēng):BD1603NUV-E2CT |
| MIC2287-24YML | 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: |
| MIC2287-24YML TR | 功能描述:LED照明驅(qū)動(dòng)器 2x2mm White LED Driver w/ 24V 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(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| MIC2287-24YML-TR | 功能描述:LED 驅(qū)動(dòng)器 IC 1 輸出 DC DC 穩(wěn)壓器 升壓（升壓） 模擬，PWM 調(diào)光 750mA（開(kāi)關(guān)） 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(lèi)型:DC DC 穩(wěn)壓器 拓?fù)?升壓（升壓） 內(nèi)部開(kāi)關(guān):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:24V 電流 - 輸出/通道:750mA（開(kāi)關(guān)） 頻率:1.2MHz 調(diào)光:模擬，PWM 應(yīng)用:背光，照相機(jī)閃光燈 工作溫度:-40°C ~ 125°C （TJ） 安裝類(lèi)型:表面貼裝 封裝/外殼:8-VFDFN 裸露焊盤(pán)，8-MLF? 供應(yīng)商器件封裝:8-MLF?（2x2） 標(biāo)準(zhǔn)包裝:1 |
| MIC2287-34BML | 制造商:MICREL 制造商全稱(chēng):Micrel Semiconductor 功能描述:1.2MHz PWM White LED Driver with OVP in 2mm 】 2mm MLF⑩ and Thin SOT-23 |
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