MP3389—12-STRING WHITE LED DRIVER WITH STEP-UP CONTROLLER

MP3389 Rev. 1.04

www.MonolithicPower.com

8

3/27/2013

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FUNCTION DIAGRAM

Control

Logic

+

-

Current Sense

Amplifier

+

-

PWM

Comparator

Oscillator

+

-

1.23V

OV

Comparator

+

-

+

-

LED1

+

-

DPWM

Oscillator

DPWM

Comparator

1.22V

Max

Min

Feedback

Control

5.5V

EA

LED OV

Comparator

Short String

Protection

Regulator

LED12

OVP

ISENSE

GND

VIN

VCC

DBRT

BOSC

ISET

COMP

OSC

EN

Enable

Control

600 mV

GATE

PGND

VFAULT

Current Control

Figure 1—MP3389 Function Block Diagram