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LM3488-Q1 Fiches technique(PDF) 11 Page - Texas Instruments |
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LM3488-Q1 Fiches technique(HTML) 11 Page - Texas Instruments |
11 / 33 page 'MC = 40x10 -6 . R SL . FS RSEN Amps second LM3488 LM3488-Q1 www.ti.com SNVS089M – JULY 2000 – REVISED MARCH 2013 Figure 24. Compensation Ramp Avoids Sub-Harmonic Oscillation The compensation ramp has been added internally in LM3488. 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: MC = VSL.FS Volts/second (3) In the above equation, VSL is the amplitude of the internal compensation ramp. Limits for VSL 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, RSL(as shown in Figure 25) increases the slope of the compensation ramp, MC by : (4) In this equation, ΔVSL is equal to 40.10 -6R SL. Hence, (5) ΔVSL versus RSL has been plotted in Figure 26 for different frequencies. Copyright © 2000–2013, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM3488 LM3488-Q1 |
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