- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄384736 > MIC3287-24YD6 (MICREL INC) 1.2MHz PWM White LED Driver with OVP in Thin SOT-23 and 2mm x 2mm MFL PDF資料下載
參數(shù)資料
| 型號(hào)： | MIC3287-24YD6 |
| 廠商： | MICREL INC |
| 元件分類(lèi)： | 顯示驅(qū)動(dòng)器 |
| 英文描述： | 1.2MHz PWM White LED Driver with OVP in Thin SOT-23 and 2mm x 2mm MFL |
| 中文描述： | LED DISPLAY DRIVER, PDSO6 |
| 封裝： | LEAD FREE, MO-193, SOT-23, 6 PIN |
| 文件頁(yè)數(shù)： | 5/9頁(yè) |
| 文件大?。?/td> | 342K |
| 代理商： | MIC3287-24YD6 |
January 2006
5
M9999-010306
MIC3287
Functional Diagram
Micrel, Inc.
Functional Description
The MIC3287 is a constant frequency pulse width modulated
(PWM) current-mode step-up regulator. The block diagram
is shown above. The MIC3287 is composed of an oscillator,
slope compensation ramp generator, current amplifier, g
m
er-
ror amplifier, PWM generator, and a 350mA minimum 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 com-
pensation 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
OVP*
VIN
250mV
g
m
OVP
V
REF
∑
Error
Amplifier
Current
Amplifier
* OVP available on TSOP-23-6 and MLF package options only.
MIC3287 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 internal 250mV 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, thus main-
taining the constant frequency current-mode PWM control.
The LED current is set by the feedback resistor:
250mV
R
FB
The enable pin shuts down the internal power bipolar
transistor and disables the control circuitry to reduce input
current-to-leakage levels. Enable pin input current is zero
at zero volts.
I
LED
=
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MIC3287-24YML | 1.2MHz PWM White LED Driver with OVP in Thin SOT-23 and 2mm x 2mm MFL |
| MIC3287YD5 | 1.2MHz PWM White LED Driver with OVP in Thin SOT-23 and 2mm x 2mm MFL |
| MIC3775-1.5BMM | 750mA UCap Low-Voltage Low-Dropout Regulator |
| MIC3775-1.65BMM | 750mA UCap Low-Voltage Low-Dropout Regulator |
| MIC3775-1.8BMM | 750mA UCap Low-Voltage Low-Dropout Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC3287-24YD6 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 |
| MIC3287-24YD6TR | 制造商:RF Micro Devices Inc 功能描述: |
| MIC3287-24YD6-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 350mA（開(kāi)關(guān)） TSOT-23-6 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）:2.8V 電壓 -?供電（最高）:6.5V 電壓 - 輸出:36V 電流 - 輸出/通道:350mA（開(kāi)關(guān)） 頻率:1.2MHz 調(diào)光:模擬，PWM 應(yīng)用:背光 工作溫度:-40°C ~ 125°C （TJ） 安裝類(lèi)型:表面貼裝 封裝/外殼:SOT-23-6 細(xì)型，TSOT-23-6 供應(yīng)商器件封裝:TSOT-23-6 標(biāo)準(zhǔn)包裝:1 |
| MIC3287-24YML | 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 Thin SOT-23 and 2mm x 2mm MFL |
| MIC3287-24YML EV | 制造商:Micrel Inc 功能描述:BOARD EVAL FOR MIC3287-24YML 制造商:Micrel Inc 功能描述:LED Lighting Development Tools White LED Driver 24V OVP Eval Board |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。