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參數(shù)資料
| 型號(hào)： | MIC3289-16YD6 |
| 廠商： | MICREL INC |
| 元件分類： | 顯示驅(qū)動(dòng)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(yè)數(shù)： | 10/13頁(yè) |
| 文件大?。?/td> | 377K |
| 代理商： | MIC3289-16YD6 |
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Micrel, Inc.
MIC3289
March 2007
10
M9999-030407
(408) 944-0800
Figure 4. Mode Change to Count Up
To return the programming pulse counter to the Count-
Down Mode, apply a negative going pulse to the DC pin
with a period equal to t
MODE_DOWN
. Now each pair of
programming pulses will cause the LED brightness to
decrease one level.
DC
MODE
t
MODE_DOWN
COUNT DOWN
Figure 5. Mode Change to Count Down
Programming the Brightness Level
When it is powered up and the DC pin is at a logic level
high for greater than t
START_UP
, the MIC3289 will begin
regulating LED drive current at the maximum brightness
level (Level 15). The internal control logic is set to
decrease
the
LED
brightness
programming pulses (falling edges of the DC input pin).
Applying a pair of clock signals as shown in Figure 6
below, decreases the brightness one level. Notice that
the first clock pulse is ignored. This is done so that Mode
Change pulses do not produce brightness changes. The
user may also elect to send a Mode Change as shown in
Figure 4 to set the MIC3289 to increment the brightness
level with subsequent programming pulses.
upon
receiving
DC
BRIGHTNESS
LEVEL
t
PROG_HIGH
t
PROG_LOW
LEVEL n
LEVEL n - 1
PULSE
IGNORED
LEVEL n + 1
Figure 6. Brightness Programming Pulses
Brightness programming pulses are not restricted to just
one pair at a time. Multiple level changes can be set as
shown in Figure 7 below. Just remember that the first
falling edge of the DC input clock will be ignored so long
as t
PROG_LOW
and t
PROG_HIGH
are not exceeded.
To maintain operation at the current brightness level
simply maintain a logic level high signal at the DC pin.
Figure 7. Decreasing Brightness Several Levels
As mentioned, the MIC3289 can be programmed to set
LED drive current to produce one of 16 distinct
brightness levels. The MIC3289s internal logic keeps
track of the brightness level with an Up/Down counter
circuit. The following section explains how the MIC3289s
brightness
counter
functions
programming pulses.
with
continued
Counter Roll-Over
The MIC3289 internal up/down counter counts from 0 to
15. When counting DOWN, and brightness level 0 is
reached, the counter will roll-over to level 15. This is
illustrated in Figure 8 below.
Figure 8. Down Counter Roll-over
When the counter Mode is set to count Up and
brightness level 15 is reached, the counter will roll-over
to level 0. Figure 9 shows that continuing to send
programming pulses will cause the brightness level to
start over at level zero.
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| MIC3289-16YD6 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 |
| MIC3289-16YD6-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） 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?fù)?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(xì)型，TSOT-23-6 供應(yīng)商器件封裝:TSOT-23-6 標(biāo)準(zhǔn)包裝:1 |
| MIC3289-16YML | 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 |
| MIC3289-16YML 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 |
| MIC3289-16YML-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） 1.2A（開關(guān)） 8-MLF?（2x2） 制造商:microchip technology 系列:- 包裝:剪切帶（CT） 零件狀態(tài):有效 類型:DC DC 穩(wěn)壓器 拓?fù)?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:8-VFDFN 裸露焊盤，8-MLF? 供應(yīng)商器件封裝:8-MLF?（2x2） 標(biāo)準(zhǔn)包裝:1 |
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