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AS1340

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 AS1340 can also be used for driving LEDs. Just simply connect the LEDs between the pins LX and FB. (see Fig-

ure 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

Note:

Where:

n .... number of LED’s

1

EN

7,9

GND

2

VCC

8

FB

5

LX

On

Off

AS1340

4.7µH

0.1µF

D1

1µF

100

Ω

3

SWVIN

6

SWOUT

4

POK

0.1µF

to 5.5V

(EQ 3)

() n

×

+

=

(EQ 4)

----------

=