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MP4021A

Primary Side Control Offline LED Controller with Active PFC

Monolithic Power Systems 

MP4021A—PRIMARY SIDE CONTROL OFFLINE LED CONTROLLER WITH ACTIVE PFC

FUNCTION DIAGRAM

N:1

EMI

filter

MULT

Multiplier

PWM/PFC

COMP

Current control

OTP

Protection

FB/NC

Real Current

Control

Latch off

or

Restart

GND

OVP

OCP

Zero Current

Detection

Zero current detection

GATE

Control Gate

driver

Current sense CS

Current

Sense

Current

LImit

Power supply

UVLO

VCC

Power Supply

ZCD

Figure 1—MP4021A Function Block Diagram

MP4021A Rev.1.04

www.MonolithicPower.com

11

7/5/2013

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