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LM3915 Datasheet(PDF) 13 Page - National Semiconductor (TI) |
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LM3915 Datasheet(HTML) 13 Page - National Semiconductor (TI) |
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13 / 25 page  Application Hints (Continued) the LED current will be at least 5 mA. R1 will typically be between 1 k Ω and2kΩ. To trim the reference voltage, vary R2. The circuit in Figure 8 shows how to add a LED intensity control which can vary LED current from 9 mA to 28 mA. The reference adjustment has some effect on LED intensity but the reverse is not true. Multiple LM3915s Figure 9 shows how to obtain a common reference trim and intensity control for two LM3915s. The two ICs may be connected in cascade for a 60 dB display or may be handling separate channels for stereo. This technique can be ex- tended for larger numbers of LM3915s by varying the values of R1, R2 and R3 in inverse proportion to the number of devices tied in. The ICs’ internal references track within 100 mV so that worst case error from chip to chip is only 0.1 dB for V REF = 10V. 00510415 FIGURE 7. Design Equations for Fixed LED Intensity www.national.com 13 |
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