STEP UP, 4 STRINGS, MAX. 350MA/STRING ANALOG AND PWM DIMMING, WHITE LED CONTROLLER

MP3398A Rev. 1.04

www.MonolithicPower.com

11

5/26/2017

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BLOCK DIAGRAM

Control

Logic

+

-

Current Sense

Amplifier

+

-

PWM

Comparator

Oscillator

+

-

1.23V

OV

Comparator

+

-

+

-

LED1

1.225V

Max

Min

Feedback

Control

6.3V

EA

Short String

Protection

Regulator

LED4

OVP

ISENSE

GND

VIN

VCC

PWM

ADIM

ISET

COMP

OSC

EN

Enable

Control

Ref

GATE

Current Control

100ns

Blanking

ILIMIT

UP_CLAMP

PWM

STOP

200 ns

Blank Time

Figure 1

—Functional Block Diagram