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Axelite Confidential Materials, do not copy or distribute without written consent.

Rev.1.7 Jul.09, 2015

AX2003

(2) Add 4.7uF Output Capacitor

VOUT

U1

AX2003

1

2

3

4

5

6

7

8

FB

EN

COMP

VCC

SW

SW

VSS

VSS

D2

LED

R2

C5

L1

D5

B240A

R5

C2

AC

12V IN

AC D4

AC D3

AC D2

AC D1

C3

0.1u

C1

4.7u

C4

100R

100n

ILED

R2

C2

C4

L1

350mA

0.715Ω

87.5mW

100uF

10nF

33uH

750mA

0.333Ω

189mW

220uF

1000mA

0.250Ω

250mW

330uF



FUNCTION DESCRIPTIONS

PWM Control

The AX2003 consists of DC/DC converters that employ a pulse-width modulation

(PWM) system. In converters of the AX2003, the pulse width varies in a range from 0 to

100%, according to the load current. The ripple voltage produced by the switching can

easily be removed through a filter because the switching frequency remains constant.

Therefore, these converters provide a low-ripple power over broad ranges of input voltage

and load current.

Setting the ILED Current

Application circuit item shows the basic application circuit with AX2003 adjustable

output version. The external resistor sets the LED output current according to the following

equation:















2

25

.

0

R

V

I LED