AS1340 データシートの表示（PDF） - Unspecified
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AS1340 Datasheet PDF : 17 Pages
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AS1340
Datasheet - Application Information
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
VIN = 2.7V
to 5.5V
C1
0.1µF
On
Off
2
VCC
3
SWVIN
6
SWOUT
L1
4.7µH
4
AS1340
POK
1
EN
D1
5
LX
COUT
1µF
8
FB
ILED
R2
100
7,9
GND
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:
VOUT = VFILED n + VFB
(EQ 3)
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
ILED = V-----F---B--
R2
(EQ 4)
www.ams.com/DC-DC_Step-Up/AS1340
Revision 1.20
11 - 17
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