AS1344 datasheet(13/19 Pages) AMSCO

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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

GND

VCC

Off

AS1344

6.8µH

10µF

VCC = 0.9V

to 3.6V

COUT

4.7µF

100

SWOUT

PGND

VOUT

POK

100k

ILED

VIN

(EQ 4)

VOUT

VF ILED

() n

VFB

(EQ 5)

ILED

VFB

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