2007. 2. 26

2/7

KAB3403T/DN

Revision No : 0

L1

4.7

µH ~ 22µH

LOAD CURRENT (mA)

10

CONVERSION EFFICIENCY

75

70

65

60

80

85

90

05

30

15

35

20

25

3.6V

3.0V

4.3V

5.0V

SW

C1

1

µF

C2

1

µF

KAB3403T/DN

D1

CTL

FB

OVD

LED1

LED2

LED3

LED4

GND

VFB

ON

Shutdown and

Dimming control

OFF

R1

16

Ω

TYPICAL APPLICATION

OVD

SW

CTL

FB

GND

Soft

Start

Error

Amp

Reference

Generator

Vref (320mV)

Shutdown

Dimming

Ramp

Generator

1.1MHz

Oscillator

OVER

VOLTAGE

DETECTION

I sens

Comparator

Q

R

S

Driver

BLOCK DIAGRAM

figure 2. KAB3403T/DN Block Diagram

NO.

SYMBOL

FUNCTION AND CONNECTION.

KAB3403T

KAB3403DN

6

1

Input supply pin. Must be locally bypassed.

5

2

GND

Ground pin. Connect directly to local ground plane,

4

3

FB

Feedback pin. Reference voltage is 320mV. Connect cathode of lowest LED and resistor here.

3

4

SW

Switch pin. Connect inductor/diode here. Minimize trace area at this pin to reduce EMI.

2

5

OVD

Over output voltage detect pin. Connect cathode of schottky diode and anode of highest LED.

1

6

CTL

Control pin : Shutdown or dimming control. Connect external enable or dimming circuits.

PIN FUNCTIONS