MP4031—PRIMARY-SIDE–CONTROLLED, OFFLINE LED CONTROLLER WITH PFC

MP4031 Rev.1.03

www.MonolithicPower.com

11

5/8/2013

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FUNCTIONAL BLOCK DIAGRAM

Current

Sense

Current

LImit

ZCD

S

D

MULT

COMP

CS/DIM

Multiplier

Zero Current

Detection

Gate

Driver

Control

Protection

Current control

PWM /

PFC

TRIAC

Phase

Detector

EMI

Filter

N:1

TRIAC

Dimmer

GND

VCC

UVLO /

EN

Power Supply

Real Current

Calculation

Zero current detection

Gate

control

OVP

OTP

Latch off

and

counting

Figure 1: Functional Block Diagram