MP4658

4-String, Max 200mA/Channel, 80V Return

LED Driver with AC/DC Feedback

MP4658 Rev. 1.0

MonolithicPower.com

1

10/13/2021

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2021 MPS. All Rights Reserved.

DESCRIPTION

The MP4658 is a 4-string, secondary-side LED

driver for LED backlighting, and is ideal for

monitor and small-sized TV LED backlighting. It

controls the flyback power stage to regulate the

LED current loop and the output supply voltage.

The MP4658 integrates 4-string LED current

balancing. Powered by a 6V to 36V input supply

voltage

(VIN),

the

MP4658

outputs

a

compensation signal to control the primary-side

flyback

(or

other

power

stage)

via

an

optocoupler to regulate the output voltage

(VOUT).

The MP4658 supports analog dimming and

PWM dimming to the LED current through the

ADIM and PDIM pins. For analog dimming,

apply a pulse signal with a frequency above

5kHz to the ADIM pin. For PWM dimming, apply

a low-frequency PWM signal to the PDIM pin.

The MP4658 also supports analog mode PWM

dimming to the LED current, which makes the

LED current rise and fall softly.

The

MP4658

features

numerous

smart

protections

to

increase

system

reliability,

including open LED protection, short LED string

protection, LEDx short-to-ground protection, FB

over-voltage protection (OVP), feedback open

protection, and thermal protection. The MP4658

is available in an SOIC-16 package.

FEATURES

• 6V to 36V Supply Voltage (V

IN)

• 80V/200mA, 4-String LED Current Balance

• Provides Feedback for the Previous Power

Stage

• <2% LED Current Accuracy

• 1.5% LED Current Balance

• Low LEDx Regulation Voltage, High

Efficiency

• Analog and PWM Dimming

• LED Open Protection, LED Short Protection

• LEDx Pin Short-to-GND Protection

• Over-Voltage Protection (OVP)

• Thermal Protection

• Available in an SOIC-16 Package

APPLICATIONS

• LCD Monitor and TVs

• Desktop LCD Flat Panel Displays

• Flat-Panel Video Displays

All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive.

For MPS green status, please visit the MPS website under Quality

Assurance. “MPS”, the MPS logo, and “Simple, Easy Solutions” are

trademarks of Monolithic Power Systems, Inc. or its subsidiaries.

TYPICAL APPLICATION

100V to

380V Bus

Flyback

D1

M1

TM

C1

AC

85V to

265V

NP

Flyback

Controller

NC

FF

12

13

16

2

11

14

GND

COMP1

4

5

COMP2

15

MP4658

ISET

VIN

10

3

OVP

9

8

7

LED1

PDIM

ADIM

LED4

FB

LED2

1

PDIM

LED3

OPT

ADIM

6

DC/DC

NSYS

C2

C3

R1

R2

D2

C4

R3

R4

R5

R6

R7

R8

C5

C6

R9

>5kHz

>100Hz

NLED

VSYS

VOUT

VLED