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參數(shù)資料
| 型號： | MIC3289-24YD6 |
| 廠商： | MICREL INC |
| 元件分類： | 顯示驅(qū)動器 |
| 英文描述： | 400 W Transient Voltage Suppressor, SOD123W (SOD2 FlatPower), Reel Pack, SMD |
| 中文描述： | LED DISPLAY DRIVER, PDSO6 |
| 封裝： | TSOT23, 6 PIN |
| 文件頁數(shù)： | 8/13頁 |
| 文件大?。?/td> | 377K |
| 代理商： | MIC3289-24YD6 |
Micrel, Inc.
MIC3289
Functional Diagram
March 2007
8
M9999-030407
(408) 944-0800
GND
Digital
I/F
PWM
Generator
Ramp
Generator
1.2MHz
Oscillator
SW
FB
OUT
VIN
DC
g
m
OVP
MIC3289 Block Diagram
Functional Description
The MIC3289 is a constant frequency, PWM current
mode boost regulator. The MIC3289 is composed of an
oscillator, slope compensation ramp generator, current
amplifier, g
m
error amplifier, PWM generator, bipolar
output transistor, digital interface with D/A converter and
Schottky rectifier diode. It features true one-wire digital
control that may be used to vary the brightness of the
output LEDs and place the device into shutdown mode.
The oscillator generates a 1.2MHz clock which triggers
the PWM generator that turns on the output transistor
and resets 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.
MIC3289 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 reference
voltage indicated by the digital interface. 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, maintaining the constant frequency
current-mode PWM control. The LED current level at
maximum brightness is set by the feedback resistor:
250mV
I
LED
=
LED
R
MIC3289 Digital Interface
The MIC3289 incorporates an easy to use single-wire,
serial programming interface allowing users to set LED
brightness to one of 16 levels spaced in a logarithmic
manner. In contrast to other solutions requiring a PWM
drive signal to maintain LED brightness, the MIC3289 is
“set and forget”, relieving the controlling processor of the
constant burden of supplying a drive signal. Additionally,
brightness levels can be preset so that LEDs can be
turned on at a particular brightness level.
State Diagram
The MIC3289 logic state flow is depicted in Figure 1
below. State changes are asynchronous and are edge
triggered, with the exception of Start Up and Shutdown,
which are level triggered.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC3289-24YD6 TR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.2MHz 0.5A Switch WLED Driver with Digital Brightness Control (lead free) RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| MIC3289-24YD6TR | 制造商:Micrel 功能描述:1.2MHz 0.5A Sw LED Drvr, MIC3289-24YD6 |
| MIC3289-24YD6-TR | 功能描述:LED 驅(qū)動器 IC 1 輸出 DC DC 穩(wěn)壓器 升壓（升壓） 1.2A（開關(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) 類型:DC DC 穩(wěn)壓器 拓撲:升壓（升壓） 內(nèi)部開關(guān):是 輸出數(shù):1 電壓 - 供電（最低）:2.5V 電壓 -?供電（最高）:6.5V 電壓 - 輸出:- 電流 - 輸出/通道:1.2A（開關(guān)） 頻率:1.2MHz 調(diào)光:- 應(yīng)用:背光 工作溫度:-40°C ~ 125°C （TJ） 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 細型，TSOT-23-6 供應(yīng)商器件封裝:TSOT-23-6 標準包裝:1 |
| MIC3289-24YML | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:1.2MHz PWM White LED Driver with Internal Schottky Diode and True 1-Wire Digital Control |
| MIC3289-24YML TR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.2MHz 0.5A Switch WLED Driver with Digital Brightness Control (lead free) RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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