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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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L7983 Fiches technique(PDF) 16 Page - STMicroelectronics |
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L7983 Fiches technique(HTML) 16 Page - STMicroelectronics |
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16 / 43 page  The dithering function, enabled by connecting the proper RFSW resistor to VCC, is intended to reduce the DC-DC electromagnetic emissions, with small impact on output voltage ripple. Figure 12. RVCC = 0 Ω, dithering enabled, no load Figure 13. RVCC = 0 Ω, dithering enabled, no load. Detail The internal dithering circuitry changes the switching frequency in the range of ± 5% of the nominal value. The device updates the frequency every clock period by fixed steps: • Ramps up in 63 steps from minimum to maximum switching frequency • Ramps down in 63 steps from maximum to minimum switching frequency The resulting frequency modulation is almost triangular, with a frequency of: FDitℎ=FSW126 (3) L7983 Switching frequency programming and dithering DS13354 - Rev 1 page 16/43 |
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