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