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 (VIN)

• 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