AS3517H-ECTP datasheet(37/94 Pages) AMSCO

tên linh kiện	AS3517H-ECTP

Giải thích chi tiết về linh kiện	Stereo Audio Codec with enhanced System Power Management

PDF	94 Pages

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nhà sản xuất	AMSCO [ams AG]

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37 / 94 page

AS3517 V17

Data Sheet, Confidential

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%.

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