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AS3722 bảng dữ liệu(PDF) 22 Page - ams-OSRAM AG

tên linh kiện AS3722
Giải thích chi tiết về linh kiện  Multi-Phase DCDC Controller PMIC
PDF  199 Pages
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nhà sản xuất  AMSOSRAM [ams-OSRAM AG]
Trang chủ  https://ams-osram.com/
Logo AMSOSRAM - ams-OSRAM AG

AS3722 bảng dữ liệu(HTML) 22 Page - ams-OSRAM AG

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ams Datasheet
Page 21
[v1-01] 2015-Sep-07
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AS3722 − Detailed Descriptions- 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 10:
DC/DC Buck Continuous Mode
DC/DC Buck Continuous Mode: Shows the DC/DC switching waveforms of for SD5 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.



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