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AS1341 데이터시트(PDF) 10 Page - ams AG

부품명 AS1341
상세설명  650mA, Ul t ra low Ripple Step Down DC/DC Conver ter
PDF  18 Pages
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제조업체  AMSCO [ams AG]
홈페이지  http://www.ams.com
Logo AMSCO - ams AG

AS1341 데이터시트(HTML) 10 Page - ams AG

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www.ams.com/DC-DC_Step-Up/AS1341
Revision 1.09
10 - 18
AS1341
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
9 Application Information
9.1 Adjusting Output Voltage
The AS1341 feedback input features dual-mode operation. Connect FB to GND for the 5.0V preset output voltage (see Figure 21 on page 8).
Adjust the output voltage by connecting a voltage-divider from the output to GND (see Figure 22).
Figure 22. Adjustable Output Voltage Circuit
Select a value for R2 between 10k and 1M
Ω.
Calculate R1 as:
(EQ 2)
Where:
VFB = 1.25V.
VOUT may range from 1.25V to VIN.
9.2 Negative Output Voltage
VIN may range from 4.5V to (20V-VOUT). Therefore the maximum negative output voltage is -15V.
Figure 23. Adjustable Negative Output Voltage Circuit
VIN
4.5V to 20V
5
IN
7
SHDNN
8
OUT
CIN
1.25V to VIN
2
GND
6
ILIMIT
1
FB
D1
COUT
+
R2
R1
Indicates High-Power Trace
AS1341
3
POK
RPULL
4
LX
L1
R
1
R
2
V
OUT
V
FB
-------------
1
–
⋅
=
VIN
4.5V to (20V-VOUT)
5
IN
7
SHDNN
4
LX
8
OUT
CIN
VOUT = -1.25V to -15V
2
GND
6
ILIMIT
1
FB
D1
L1
R2
R1
Indicates High-Power Trace
AS1341
3
POK
COUT
+



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