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LM3915N 데이터시트(PDF) 14 Page - National Semiconductor (TI) |
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LM3915N 데이터시트(HTML) 14 Page - National Semiconductor (TI) |
14 / 25 page 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 HI 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 Ω 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 intervals. 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. 00510416 *9 mA < ILED < 28 mA @ VREF = 10V FIGURE 8. Varying LED Intensity 00510417 FIGURE 9. Independent Adjustment of Reference Voltage and LED Intensity for Multiple LM3915s www.national.com 14 |
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