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AS1344 Datasheet(PDF) 13 Page - ams AG

No. de pieza AS1344
Descripción Electrónicos  42V, DC-DC Boost Converter with adjustable Softstart
PDF  19 Pages
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Fabricante Electrónico  AMSCO [ams AG]
Página de inicio  http://www.ams.com
Logo AMSCO - ams AG

AS1344 Datasheet(HTML) 13 Page - ams AG

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AS1344
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
LED Power Supply Application
The AS1344 can also be used for driving LEDs. Just simply connect the LEDs between the pins VOUT and FB. (see
Figure 36).
Figure 36. LED Supply Application
The output voltage is adjusted automatically to the required voltage of the LEDs. This voltage depends on the forward
voltage (VF) of the used LEDs and the Feeback Voltage VFB.
Calculate VOUT by:
Note:
The brightness of the LEDs can directly be adjusted by setting the current ILED via the corresponding R2.
Calculate R2 by:
Where:
VFB = 1.25V
n .... number of LEDs
RV
1
EN
3
GND
4
VCC
10
FB
6
LX
On
Off
AS1344
L1
6.8µH
C1
10µF
VCC = 0.9V
to 3.6V
D1
COUT
4.7µF
R2
100
Ω
7
SWOUT
5
PGND
9
VOUT
2
POK
R3
100k
Ω
ILED
8
VIN
(EQ 4)
VOUT
VF ILED
() n
×
VFB
+
=
(EQ 5)
ILED
VFB
R2
----------
=



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