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AS3715 Datasheet(PDF) 14 Page - ams AG

Part # AS3715
Description  Dual Power Path PMIC
PDF  160 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS3715 Datasheet(HTML) 14 Page - ams AG

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Page 14
ams Datasheet, Confidential
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[v1-00] 2014-Sep-10
AS3715 − Detailed Description – Power Management Functions
Mode Settings
Low Ripple, Low Noise Operation:
Bit settings: sdX_low_noise=1
In this mode there is no minimum coil current necessary before
switching OFF the PMOS. As long as the load current is superior
to the ripple current the device operates in continuous mode.
Figure 8:
DC/DC Buck Continuous Mode
DC/DC Buck Continuous Mode: Shows the DC/DC switching waveforms of for SD3 at about 500mA.
When the load current gets lower, the discontinuous mode is
triggered. As result, the auto-zero comparator stops the NMOS
conduction to avoid load discharger and the duty cycle is
reduced down to tmin_on to keep the regulation loop stable.
This results in a very low ripple and noise, but decreased
efficiency, at light loads, especially at low input to output
voltage differences.
Figure 9:
DC/DC Buck Dis-continuous Mode
DC/DC Buck Dis-continuous Mode: Shows the DC/DC switching waveforms of for SD3 at about 60mA.



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