MP3378E

– 4-CHANNEL WLED CONTROLLER WITH BUCK CONVERTER

MP3378E Rev. 1.02

www.MonolithicPower.com

12

5/26/2017

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BLOCK DIAGRAM

Control

Logic

+

-

Current Sense

Amplifier

+

-

PWM

Comparator

Oscillator

+

-

1.23V

OV

Comparator

+

-

+

-

LED1-4

1

1.225V

Max

Min

Feedback

Control

6.3V

EA

Short-String

Protection

Regulator

OVP

ISENSE

GND1

VIN1

VCC1

PWM

ADIM

ISET

COMP

OSC

EN1

WLED

Enable

Ref

GATE

Current Control

100 ns

Blanking

ILIMIT

UP_ CLAMP

PWM

STOP

200ns

Blank Time

VIN2

VCC2

SYNC

EN2

FB

BST

SW

GND2

RSEN

LDO

On-Time

Control Logic

Current Limit

Comparator

VCC

Regulator

Rference

Error Amplifier

HS

Driver

LS

Driver

VCC2

1pF

50pF

400k

AGND

OSC

Figure 1: Functional Block Diagram