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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LP2950 датащи(PDF) 16 Page - National Semiconductor (TI) |
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LP2950 датащи(HTML) 16 Page - National Semiconductor (TI) |
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16 / 26 page  Application Hints (Continued) REDUCING OUTPUT NOISE In reference applications it may be advantageous to reduce the AC noise present at the output. One method is to reduce the regulator bandwidth by increasing the size of the output capacitor. This is the only way noise can be reduced on the 3 lead LP2950 but is relatively inefficient, as increasing the capacitor from 1µF to 220µF only decreases the noise from 430µV to 160µV rms for a 100kHz bandwidth at 5V output. Noise can be reduced fourfold by a bypass capacitor across R 1, since it reduces the high frequency gain from 4 to unity. Pick or about 0.01µF. When doing this, the output capacitor must be increased to 3.3µF to maintain stability. These changes reduce the output noise from 430µV to 100µV rms for a 100kHz bandwidth at 5V output. With the bypass capacitor added, noise no longer scales with output voltage so that improvements are more dramatic at higher output voltages. Typical Applications 1A Regulator with 1.2V Dropout 00854622 300mA Regulator with 0.75V Dropout Wide Input Voltage Range Current Limiter 00854621 00854609 *Minimum input-output voltage ranges from 40mV to 400mV, depending on load current. Current limit is typically 160mA. 00854607 *See Application Hints **Drive with TTL-high to shut down. Ground or leave open if shutdown feature is not to be used. Note: Pins 2 and 6 are left open. FIGURE 2. Adjustable Regulator www.national.com 16 |
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