MP4653

Real LIPS CC/CV Mode

LLC TV LED Driver

MP4653 Rev 1.01

www.MonolithicPower.com

1

6/28/2012

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

© 2012 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP4653 is a CC/CV mode LLC TV LED

driver for LED backlighting, especially for large

size TV LED backlighting. Powered by 9V to

30V input supplies, the MP4653 outputs two

180 degree phase shifted driving signals for the

external power stages. Its enhanced 9V gate

driver provides adequate driving capability and

can directly drive the external MOSFETs

through an external gate driving transformer.

The MP4653 integrates a constant current

control loop for the LED current regulation and

also a constant voltage control loop for the DC

bus voltage, which is used to generate system

power supplies like 12V/5V with other DC/DC

converters. The CC/CV control loop programs

the operating frequency of the LLC power stage

and thus regulates the LED current and also the

bus voltage.

The MP4653 incorporates both analog dimming

and PWM dimming to the LED current. A

driving signal is output to directly drive the

dimming MOSFET, which helps to achieve fast

and high contrast ratio PWM dimming.

The PWM dimming signal is also used for the

CC/CV mode control. At PWM on interval, the

CC mode is effective and the LED current is

regulated; at PWM off interval, the CV mode is

effective and the DC bus voltage is regulated.

The gate driving signal and thus the energy

through the power stage are continuous at both

the PWM on interval and the PWM off interval.

This helps to eliminate the system audible noise

at PWM dimming.

The MP4653 features sufficient and smart

protection to increase system reliability. It

protects the fault condition at both the DC bus

stage and the LED driver stage.

The protection for the DC bus stage includes

the over voltage protection and over current

protection (short protection).

The protection for the LED driver stage includes

the open LED protection, short LED protection,

over LED current protection and any point of

LED string short to ground protection.

Thermal protection is integrated in MP4653.

The MP4653 is available in SOIC20 package.

FEATURES

 Secondary Side “Real LIPS” LLC Controller

 CC/CV Frequency Control Loop

 Audible Noise Elimination

 Continuous driving signal at PWM dimming

and LED fault condition

 9V to 30V Input Voltage Range

 Analog and PWM Dimming

 Input Under Voltage Lockout

 DC Bus Output Over Voltage Protection

 DC Bus Short Protection

 System Auto-recovery and Hiccup Timer

 LED Open, Short Protection

 LED Output Over Voltage, Over LED

Current Protection

 Any Point of LED String Short to GND

Protection

 Available in SOIC 20 Package

APPLICATIONS

 LCD TVs and Monitors

 Desktop LCD Flat Panel Displays

 Flat Panel Video Displays

 Street Lighting

All MPS parts are lead-free and adhere to the RoHS directive. For MPS green

status, please visit MPS website under Products, Quality Assurance “MPS”

and “The Future of Analog IC Technology” are Registered Trademarks of

Monolithic Power Systems, Inc.