High Integrated U-Type CCFL Backlight Driver

OB3309 is a high integrated and high performance U-type Cold Cathode Fluorescent Lamp (CCFL) controller optimized for LCD monitor backlight application. Comprehensive protection functions are integrated, thus it provides a low-cost and high reliability LCD backlight solution with minimum system BOM count. OB3309 controls push pull topology and supports various dimming functions.


Minimal required external components
Push pull topology
High precision reference and frequency control
External programmability of the key parameters
Flexible Dimming mode Control:
Selective dimming polarity
Analog, internal burst and external burst (LPWM) dimming control
0-2V DC voltage or external PWM direct dimming control without external circuits
Dimming range programmable (100%~0%)
Comprehensive protection coverage:
Output over voltage protection (OVP)
Output over current protection (OCP)
Open lamp protection and short lamp protection
Arcing protection
Available in SOP16 package, RoHS compliant


LCD CCFL backlight system in
LCD Monitor/TV

Typical Application: