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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LM2727 датащи(PDF) 16 Page - National Semiconductor (TI) |
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LM2727 датащи(HTML) 16 Page - National Semiconductor (TI) |
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16 / 22 page  Example Circuits (Continued) The circuits in Figure 6 are intended for ADSL applications, where the high switching frequency keeps noise out of the data transmission range. In this design, the 1.8 and 3.3V outputs come up simultaneously by using the same softstart capacitor. Because two current sources now charge the same capacitor, the capacitance must be doubled to achieve the same softstart time. (Here, 40nF is used to achieve a 5ms softstart time.) A common softstart capacitor means that, should one circuit enter current limit, the other circuit will also enter current limit. In addition, if both circuits are built with the LM2727, a UVP or OVP fault on one circuit will cause both circuits to latch off. The additional compensation components Rc2 and Cc3 are needed for the low ESR, all ceramic output capacitors, and the wide (3x) range of Vin. 20049407 FIGURE 6. 1.8V and 3.3V, 1A, 1.4MHz, Simultaneous www.national.com 16 |
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