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VIPER26 датащи(PDF) 16 Page - STMicroelectronics |
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VIPER26 датащи(HTML) 16 Page - STMicroelectronics |
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16 / 25 page ![]() Burst mode VIPER26 16/25 Doc ID 17736 Rev 2 13 Burst mode When the voltage VCOMP drops below the threshold, VCOMPL, the power MOSFET is kept in OFF state and the consumption is reduced to IDD0 current, as reported on Table 7 on page 6. As reaction at the energy delivery stop, the V COMP voltage increases and as soon as it exceeds the threshold VCOMPL + VCOMPL_HYS, the converter starts switching again with consumption level equal to IDD1 current. This ON-OFF operation mode, referred to as “burst mode” and reported on Figure 25 on page 16, reduces the average frequency, which can go down even to a few hundreds hertz, thus minimizing all frequency-related losses and making it easier to comply with energy saving regulations. During the burst mode, the drain current limit is reduced to the value IDlim_bm (reported on Table 8 on page 7) in order to avoid the audible noise issue. Figure 25. Load-dependent operating modes: timing diagrams Figure 24. COMP pin voltage versus IDLIM time time time V COMP V COMPL +VCOMPL_HYS V COMPL I DD1 I DD0 I DD I DRAIN I Dlim_bm Burst Mode |
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