データシートサーチシステム |
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LM3478MMX データシート(PDF) 11 Page - National Semiconductor (TI) |
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LM3478MMX データシート(HTML) 11 Page - National Semiconductor (TI) |
11 / 21 page Functional Description (Continued) The compensation ramp has been added internally in LM3478. The slope of this compensation ramp has been selected to satisfy most of the applications. The slope of the internal compensation ramp depends on the frequency. This slope can be calculated using the formula: M C =VSL.FS Volts/second In the above equation, V SL is the amplitude of the internal compensation ramp. Limits for V SL have been specified in the electrical characteristics. In order to provide the user additional flexibility, a patented scheme has been implemented inside the IC to increase the slope of the compensation ramp externally, if the need arises. Adding a single external resistor, R SL(as shown in Figure 4) increases the slope of the compensation ramp, M C by : In this equation, ∆V SL is equal to 40.10 -6R SL. Hence, ∆V SL versus RSL has been plotted in Figure 5 for different frequencies. 10135511 FIGURE 3. Compensation Ramp Avoids Sub-Harmonic Oscillation www.national.com 11 |
同様の部品番号 - LM3478MMX |
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同様の説明 - LM3478MMX |
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