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AS3722 Datasheet(PDF) 24 Page - ams-OSRAM AG |
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AS3722 Datasheet(HTML) 24 Page - ams-OSRAM AG |
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24 / 199 page  ams Datasheet Page 23 [v1-01] 2015-Sep-07 Document Feedback AS3722 − Detailed Descriptions- Power Management Functions Bit settings: sdX_low_noise=0 In this mode there is a minimum coil current necessary before switching off the PMOS. As a result there are less pulses necessary at low output loads, and therefore the efficiency at low output load is increased. As drawback this mode increases the ripple up to higher output currents. The crossover point to power save operation is already reached at reasonable high output currents (~10% of the DCDC current limit). Figure 13: DC/DC Buck Dis-Continuous Mode & High Efficiency 1/2 DC/DC Buck Dis-Continuous Mode: Shows the DC/DC switching waveforms of for SD5 at about 60mA with the low_noise bit deactivated. Figure 14: DC/DC Buck Dis-Continuous Mode & High Efficiency 2/2 DC/DC Buck Dis-Continuous Mode: Shows the DC/DC switching waveforms of for SD5 at about 10mA with the low_noise bit deactivated. |
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