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AS3517H-ECTP Datasheet(PDF) 37 Page - ams AG

Part # AS3517H-ECTP
Description  Stereo Audio Codec with enhanced System Power Management
PDF  94 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS3517H-ECTP Datasheet(HTML) 37 Page - ams AG

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AS3517 V17
Data Sheet, Confidential
© 2003-2007, austriamicrosystems AG, 8141 Unterpremstaetten, Austria-Europe. All Rights Reserved.
www.austriamicrosystems.com
Figure 21 –DCDC buck with disabled current force / pulse skip mode
1: LXC1 voltage, 2:coil current (1mV=1mA) 3: output voltage
High efficiency operation:
In this mode there is a minimum coil current necessary before switching off the PMOS. As result, fewer pulses at low output loads are
necessary, and therefore the efficiency at low output load is increased. On the other hand the output voltage ripple increases, and the
noisy pulse skip operation is on up to a higher output current.
Figure 22 –DCDC buck with enabled current force / pulse skip mode
1: LXC1 voltage, 2:coil current (1mV=1mA) 3: output voltage
It’s also possible to switch between these two modes dynamically during operation:
100% PMOS ON mode for low dropout regulation:
For low input to output voltage difference the DCDC converter can use 100% duty cycle for the PMOS transistor, which is then in LDO
mode. This feature is enabled if the output voltage drops by more than 4%.
Revision 1v3
36
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