MP3304 –36V, 1.3A, STEP-UP WHITE LED DRIVER WITH HIGH FREQUENCY TRUE PWM DIMMING

MP3304 Rev. 0.91

www.MonolithicPower.com

9

4/19/2010

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2010 MPS. All Rights Reserved.

TYPICAL APPLICATION CIRCUITS

MP3304C

5V

Enable/

Dimming

Control

LED1

LED2

LED3

LED28

LED29

LED30

IN

EN

GND

LED

ISET

SW

String 1

String 10

...

C1

10uF

C2

2.2uF

L1

2uH

D1

B0530

Figure 4 — Driving 30 WLEDs (3 WLEDs in Series and 10 Strings Paralleled) with 5V Input Voltage

MP3304A

SW

IN

ISET

LED

PGND

GND

EN

VIN

Bias

EN

GND

C2

4.7uF

16V

C1

4.7uF

16V

L1

4.7uH

5V

D1

B0540

C5

0.47uF

50V

LED+

LED-

C3

0.1uF

C4

NS

R4

NS

R3

3.32

1%

R2

0

R1

100

U1

JP1

5

8

7

6

2

1

3

Figure 5 — Driving 27 WLEDs (9 WLEDs in Series and 3 Strings Paralleled) with 5V Input Voltage