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AS3715 bảng dữ liệu(PDF) 16 Page - ams-OSRAM AG

tên linh kiện AS3715
Giải thích chi tiết về linh kiện  Dual or Single Power Path PMIC
PDF  159 Pages
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nhà sản xuất  AMSOSRAM [ams-OSRAM AG]
Trang chủ  https://ams-osram.com/
Logo AMSOSRAM - ams-OSRAM AG

AS3715 bảng dữ liệu(HTML) 16 Page - ams-OSRAM AG

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ams Datasheet
Page 15
[v1-03] 2015-Aug-10
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AS3715 − Detailed Description – Power Management Functions
Only in the case the load current gets so small that less than the
minimum ON-time of the PMOS would be needed to keep the
loop in regulation the regulator will enter low power mode
operation and skip pulses during this time. The crossover point
is about ~1% of the DCDC current limit.
Figure 10:
DC/DC Buck Dis-Continuous & Low Power Mode
DC/DC Buck Dis-Continuous & Low Power Mode: Shows the DC/DC switching waveforms of SD3 at about
10mA.
High Efficiency Operation (Default Setting)
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 at lower output currents.
The crossover point to low power mode is already reached at
reasonable high output currents (~10% of the DCDC current
limit).
Figure 11:
DC/DC Buck Dis-Continuous Mode & High Efficiency 1/2
DC/DC Buck Dis-Continuous Mode: Shows the DC/DC switching waveforms of SD3 at about 60mA with the
low_noise bit deactivated.



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