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L6985F 数据表(PDF) 23 Page - STMicroelectronics |
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L6985F 数据表(HTML) 23 Page - STMicroelectronics |
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23 / 65 page  DocID027836 Rev 2 23/65 L6985F Functional description 65 4.5 Light-load operation The MLF pinstrapping during the power-up phase determines the light-load operation (refer to Table 7 on page 11). 4.5.1 Low noise mode (LNM) The low noise mode implements a forced PWM operation over the different loading conditions. The LNM features a constant switching frequency to minimize the noise in the final application and a constant voltage ripple at fixed VIN. The regulator in steady loading condition never skip pulses and it operates in the continuous conduction mode (CCM) over the different loading conditions thus making this operation mode ideal for noise sensitive applications. Figure 13. Low noise mode operation |
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