MP3378

– 4-CHANNEL WLED CONTROLLER PLUS BUCK CONVERTER

MP3378 Rev. 1.01

www.MonolithicPower.com

12

5/26/2017

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FUNCTIONAL BLOCK DIAGRAM

Control

Logic

+

-

Current-Sense

Amplifier

+

-

PWM

Comparator

Oscillator

+

-

1.23 V

OV

Comparator

+

-

+

-

LED1-4

1

1. 225 V

Max

Min

Feedback

Control

6.3 V

EA

Short-String

Protection

Regulator

OVP

ISENSE

GND1

VIN1

VCC1

PWM

ADIM

ISET

COMP

OSC

EN

Enable

Control

Ref

GATE

Current Control

100 ns

Blanking

ILIMIT

UP_ CLAMP

PWM

STOP

200 ns

Blank Time

VIN2

VCC2

AAM

SYNC

FB

BST

SW

GND2

RSEN

LDO

On-Time

Control Logic

Current-Limit

Comparator

VCC

Regulator

Rference

Error Amplifier

HS

Driver

LS

Driver

VCC

1 pF

50 pF 400 k

AGND

Figure 1

—Functional block diagram