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AS3517 Datasheet(PDF) 42 Page - ams AG

Part # AS3517
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

AS3517 Datasheet(HTML) 42 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
9.2.4
15V Step-Up Converter
General
The integrated Step-Up DC/DC Converter is a high efficiency current-mode PWM regulator, providing an output voltage up to 15V. A
constant switching-frequency results in a low noise on supply and output voltages. When using an additional transistor the output voltage
can be up to 25V to drive 6 white LED in series.
It has an adjustable sink current (1.25 to 37.5mA) to provide e.g. dimming function when driving white LEDs as back-light.
Figure 25 DCDC15 Block Diagram
Parameter
Table 32 15V Step-Up Converter Parameter
Symbol
Parameter
Min
Typ
Max
Unit
Notes
VSW
High Voltage Pin
0
15
V
Pin SW15
IVDD
Quiescent Current
140
µA
Pulse Skipping mode
VFB
Feedback Voltage, Transient
0
5.5
V
Pin ISINK
VFB
Feedback Voltage, during
Regulation
0.65
0.83
1.0
V
Pin ISINK
ISW_MAX
Current Limit
350
510
750
mA V15_ON = 1
RSW
Switch Resistance
0.85
1.54
Ω
V15_ON = 0
ILOAD
Load Current
0
45
mA @ 15V output voltage
VPULSESKIP
Pulse-skip Threshold
1.2
1.33
1.5
V
Voltage at pin ISINK, pulse skips are
introduces when load current becomes
too low.
FIN
Fixed Switching Frequency
0.5
0.55
0.6
MHz
COUT
Output Capacitor
1
µF
Ceramic
ILOAD > 20mA
17
22
27
µH
Use inductors with small CPARASITIC
(<100pF) for high efficency
L (Inductor)
ILOAD < 20mA
8
10
27
tMIN_ON
Minimum On-Time
90
180
ns
Guaranteed per design
MDC
Maximum Duty Cycle
85
91
98
%
Guaranteed per design
BVDD=3.6V; Tamb=25ºC; unless otherwise specified
Revision 1v3
41
- 93



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