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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PM6681ATR датащи(PDF) 22 Page - STMicroelectronics |
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PM6681ATR датащи(HTML) 22 Page - STMicroelectronics |
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22 / 47 page  Device description PM6681A 22/47 Equation 5 For higher loads the inductor current doesn't cross the zero and the device works in the same way as in PWM mode and the frequency is fixed to the nominal value. Figure 33. PWM and pulse skip mode inductor current Figure 33 shows inductor current waveforms in PWM and SKIP mode. In order to keep average inductor current equal to load current, in SKIP mode some switching cycles are skipped. When the output ripple reaches the regulated voltage Vreg, a new cycle begins. The off cycle duration and the switching frequency depend on the load condition. As a result of the control technique, losses are reduced at light loads, improving the system efficiency. 7.5 No-audible skip mode If SKIP pin is tied to VREF, a no-audible skip mode with a minimum switching frequency of 33 kHz is enabled. At light load condition, If there is not a new switching cycle within a 30 µs (typ.) period, a no-audible skip mode cycle begins. Figure 34. No audible skip mode ON OUT IN T L 2 V V ) SKIP ( ILOAD × × − = Time 0 Inductor current No audible skip mode Low side ∼30us |
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