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

MP4031 Rev.1.03

www.MonolithicPower.com

16

5/8/2013

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approximately as:

p

FB

o

12

A_ DIM

s

p

12

12

I

NV

I

RR

2

VR I

RR

RR

⋅

=⋅

⋅+

⋅

⋅

++

As the equation shows, the output current Io

increasing from 0V to 10V.

EMI

Filter

N:1

COMP

GND

D

S

VCC

MULT

MP4031

1

CS /DIM

ZCD

Interface

circuit

Isolation

circuit

Rs

Ip

Power

supply

0-10V

Dimmer

R1

R2

Figure 13: Typical Application Circuit for Analog Dimming