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AS3689 Datasheet(PDF) 12 Page - ams-OSRAM AG

Part # AS3689
Description  Flexible Lighting Management
PDF  72 Pages
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Manufacturer  AMSOSRAM [ams-OSRAM AG]
Direct Link  https://ams-osram.com/
Logo AMSOSRAM - ams-OSRAM AG

AS3689 Datasheet(HTML) 12 Page - ams-OSRAM AG

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AS3689
austriami crosyst ems
Datasheet, Confidential
www.austriamicrosystems.com (mlg, ptr)
Revision 1.0.2 / 20070115
10 - 70
7.2
Step Up DC/DC Converter
The Step Up DC/DC Converter is a high-efficiency current mode PWM regulator, providing output voltage up to
25V and a load current up to 50mA. A constant switching-frequency results in a low noise on the supply and
output voltages.
Figure
10 – Step Up DCDC Converter Block Diagramm Option: Current Feedback with Overvoltage protection
Step Up DC/DC
Converter
C9
4.7µF
C10
1.5nF
Q1
SENSE_N
DCDC_GATE
DCDC_FB
R3
1M
C2
1µF
R2
Battery
D1
L1
10µH
C11
15nF
R4
100k
CURR1
CURR2
HV Current Sinks
each 0.156-40mA
CURR6
D8
D9
D10
D12
D11
D13
D15
D14
D16
SENSE_P
Table
6 – Step Up DC/DC Converter Parameters
Symbol
Parameter
Min
TYP
Max
Unit
Note
IVDD
Quiescent Current
140
µ A
Pulse skipping mode.
VFB1
Feedback Voltage for
External Resistor Divider
1.20
1.25
1.30
V
For constant voltage control.
step_up_res=1
VFB2
Feedback Voltage for Current
Sink Regulation
0.4
0.5
0.6
V
on CURR1, CURR2 or CURR6 in
regulation.
step_up_res=0
Additional Tuning Current at
Pin DCDC_FB and
overvoltage protection
0
30
µ A
IDCDC_FB
Accuracy of Feedback
Current at full scale
-6
6
%
Adjustable by software using
Register DCDC control1
1µA step size (0-15µA)
VPROTECT = 1.25V +
IDCDC_FB * R3



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