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LM2611BMFX bảng dữ liệu(PDF) 11 Page - National Semiconductor (TI) |
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LM2611BMFX bảng dữ liệu(HTML) 11 Page - National Semiconductor (TI) |
11 / 13 page Application Circuits (Continued) Shutdown/Soft Start A soft start circuit is used in switching power supplies to limit the input inrush current upon start-up. Without a soft-start circuit, the inrush current can be several times the steady-state load current, and thus apply unnecessary stress to the input source. The LM2611 does not have soft-start circuitry, but implementing the circuit in Figure 11 will lower the peak inrush current. The SHDN pin is coupled to the output through C SS. The LM2611 is toggled between shutdown and run states while the output slowly decreases to its steady-state value. The energy required to reach steady-state is spread over a longer time and the input current spikes decrease (see Figure 12 and Figure 13). 20018125 FIGURE 11. LM2611 Soft Start Circuit 20018142 FIGURE 12. Start-Up Waveforms with Soft Start Circuit 20018141 FIGURE 13. Start-Up Waveforms without Soft Start Circuit www.national.com 11 |
Số phần tương tự - LM2611BMFX |
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Mô tả tương tự - LM2611BMFX |
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