- 您現在的位置：買賣IC網 > PDF目錄361028 > LM3916N (NATIONAL SEMICONDUCTOR CORP) Dot/Bar Display Driver PDF資料下載
參數資料
| 型號： | LM3916N |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 顯示驅動器 |
| 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： | 13/27頁 |
| 文件大小： | 509K |
| 代理商： | LM3916N |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁當前第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁
Application Hints
(Continued)
mA to flow from pin 7 into the divider which means that the
LED current will be at least 10 mA. R1 will typically be be-
tween 1 k
and 5 k
. To trim the reference voltage, vary R2.
The current in Figure 11 shows how to add a LED intensity
control which can vary LED current from 5 mA to 28 mA.
Choosing V
= 5V lowers the current drawn by the ladder,
increasing the intensity adjustment range. The reference ad-
justment has some effect on LED intensity but the reverse is
not true.
Multiple Drivers
Figure 12shows how to obtain a common reference trim and
intensity control for two drivers. The two ICs may be con-
nected in cascade or may be handling separate channels for
stereo. This technique can be extended for larger numbers
of drivers by varying the values of R1, R2 and R3. Because
the LM3915 has a greater ladder resistance, R5 was picked
less than R7 in such a way as to provide equal reference
load currents. The ICs’ internal references track within
100 mV so that worst case error from chip to chip is only 0.2
dB for V
REF
= 5V.
The scheme in Figure 13 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 25 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.
DS007971-17
FIGURE 10. Design Equations for Fixed LED Intensity
DS007971-18
5 mA
≤
I
LED
≤
28 mA
@
V
REF
= 5V
FIGURE 11. Varying LED Intensity
L
www.national.com
13
相關PDF資料 |
PDF描述 |
|---|---|
| LM3916N-1 | 6 PIN MINI DIN CABLE MM 50FT |
| LM395 | Ultra Reliable Power Transistors |
| LM395T | Ultra Reliable Power Transistors |
| LM399 | Precision Reference |
| LM3999Z | IC-6.95V PRECISION REFERENCE |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LM3916N/A+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Vacuum Fluorescent Display Driver |
| LM3916N/B+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Vacuum Fluorescent Display Driver |
| LM3916N1 | 制造商:National Semiconductor 功能描述:LED DRVR 10Segment 3.3V/5V/9V/12V/15V/18V/24V 18-Pin PDIP Tube |
| LM3916N-1 | 功能描述:LED照明驅動器 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: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| LM3916N-1 | 制造商:Texas Instruments 功能描述:LED BAR GRAPH DRIVER 3916 DIP18 |
發布緊急采購，3分鐘左右您將得到回復。