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參數(shù)資料
| 型號(hào)： | LM3915N-1 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 顯示驅(qū)動(dòng)器 |
| 英文描述： | Dot/Bar Display Driver |
| 中文描述： | LED DISPLAY DRIVER, PDIP18 |
| 封裝： | PLASTIC, DIP-18 |
| 文件頁數(shù)： | 13/24頁 |
| 文件大?。?/td> | 602K |
| 代理商： | LM3915N-1 |
Application Hints
(Continued)
The scheme in Figure 10 is useful when the reference and
LED intensity must be adjusted independently over a wide
range. The R
voltage can be adjusted from 1.2V to 10V
with no effect on LED current. Since the internal divider here
does not load down the reference, minimum LED current is
much lower. At the minimum recommended reference load
of 80 μA, LED current is about 0.8 mA. The resistor values
shown give a LED current range from 1.5 mA to 20 mA.
At the low end of the intensity adjustment, the voltage drop
across the 510
current-sharing resistors is so small that
chip to chip variation in reference voltage may yield a visible
variation in LED intensity. The optional approach shown of
connecting the bottom end of the intensity control pot to a
negative supply overcomes this problem by allowing a larger
voltage drop across the (larger) current-sharing resistors.
Other Applications
For increased resolution, it’s possible to obtain a display with
a smooth transition between LEDs. This is accomplished by
varying the reference level at pin 6 by 3 dBp-p as shown in
Figure 11 The signal can be a triangle, sawtooth or sine
wave from 60 Hz to 1 kHz. The display can be run in either
dot or bar mode.
When an exponentially decaying RC discharge waveform is
applied to pin 5, the LM3915’s outputs will switch at equal in-
tervals. This makes a simple timer or sequencer. Each time
interval is equal to RC/3. The output may be used to drive
logic, opto-couplers, relays or PNP transistors, for example.
DS005104-17
FIGURE 9. Independent Adjustment of Reference Voltage and LED Intensity for Multiple LM3915s
L
www.national.com
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相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM3915N | Dot/Bar Display Driver |
| LM3915 | Dot/Bar Display Driver |
| LM391N-100 | LM391 Audio Power Driver |
| LM3914VX | LED Display Driver |
| LM391 | LM391 Audio Power Driver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM3915N-1 | 制造商:Texas Instruments 功能描述:LED BAR GRAPH DRIVER 3915 DIP18 |
| LM3915N-1/HALF | 制造商:Texas Instruments 功能描述:LED BAR GRAPH DRIVER 3915 DIP18 |
| LM3915N-1/NOPB | 功能描述:LED照明驅(qū)動(dòng)器 DOT/BAR DISPLAY DRVR 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 |
| LM3915N-1/NOPB | 制造商:Texas Instruments 功能描述:LED Driver IC |
| LM3916 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Dot/Bar Display Driver |
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