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AS1340 Datenblatt(PDF) 11 Page - ams AG

Teilenummer AS1340
Bauteilbeschribung  50V, Micropower, DC-DC Boost Converter
PDF  17 Pages
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Hersteller  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS1340 Datenblatt(HTML) 11 Page - ams AG

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www.ams.com/DC-DC_Step-Up/AS1340
Revision 1.20
11 - 17
AS1340
Datasheet - Application In form atio n
9.5 LED Power Supply Application
The AS1340 can also be used for driving LEDs. Just simply connect the LEDs between the pins LX and FB. (see Figure 29).
Figure 29. 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 Feedback 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 LED’s
1
EN
7,9
GND
2
VCC
8
FB
5
LX
On
Off
AS1340
L1
4.7µH
C1
0.1µF
D1
COUT
1µF
R2
100
3
SWVIN
6
SWOUT
4
POK
C1
0.1µF
ILED
VIN
= 2.7V
to 5.5V
(EQ 3)
VOUT
VF ILED
 n
VFB
+
=
(EQ 4)
ILED
VFB
R2
----------
=



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