MP3385A – 4-STRING WLED CONTROLLER WITH I

MP3385A Rev. 1.01

www.MonolithicPower.com

24

8/29/2017

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© 2017 MPS. All Rights Reserved.

TYPICAL APPLICATION CIRCUIT

0

R17

4.7

50V

C1

220 F/50 V

C7

33 H/3.5 A

L1

B3 80

D1

4.

C2

22

100V

C9

NC

C8

0

R14

0

R15

0

R16

M1

100V/5A

168k

R2

0.4 7 F

C5

0.4 7 F

C3

4.5 V-3 3V

Up to 80V

SC L

6

PW M

5

LPF

9

EN

3

SD A

7

LED3

14

LED2

16

LED1

17

OVP

18

PGN D

15

MP3385A

U1

AGND

AGND

100k

R3

AGND

GND

AGND

0

R5

270

R4

470nF

C4

AGND

2k

R6

100k

R7

AGND

100k

R8

100k

R9

100k

R1 3

2k

R1 2

AGND

AGND

AGND

PGND

PGND

PGND

PGND

NC

C6

100k

R18

VC C

0

R20

10

R21

NC

R19

F1

AGND

50m

R1

0

R22

VCC

VCC

VIN

GND1

EN

SCL

GND2

SDA

PWM

LED+

LED1

LED2

LED3

LED4

FT

NC

C10

Figure 4: Driving 4 LED Strings

NOTE:

Remove the LPF capacitor (C5) when the MP3385A works in direct PWM dimming.

Some components value may need to be adjusted for different application condition.