AS3722 datasheet(21/198 Pages) AMSCO

Il numero della parte	AS3722

Spiegazioni elettronici	Multi-Phase DCDC Controller PMIC

PDF	198 Pages

Scroll/Zoom	100%

Produttore elettronici	AMSCO [ams AG]

Homepage	http://www.ams.com

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21 / 198 page

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.

AS3722 Scheda tecnica(PDF) 21 Page - ams AG