OB3309 Datasheet – CCFL Backlight Controller ( PDF )

Part Number: OB3309

Function: High Integrated U-Type CCFL Backlight Driver

Package: DIP, SOP 16 Type

Manufacturer: On-Bright Electronics

OB3309 datasheet


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.


1. Minimal required external components
2. Push pull topology
3. High precision reference and frequency control
4. External programmability of the key parameters

5 Flexible Dimming mode Control:
(1) Selective dimming polarity
(2) Analog, internal burst and external burst (LPWM) dimming control
(3) 0-2V DC voltage or external PWM direct dimming control without external circuits
(4) Dimming range programmable (100%~0%)

6. Comprehensive protection coverage:
(1) Output over voltage protection (OVP)
(2) Output over current protection (OCP)
(3) Open lamp protection and short lamp protection
(4) Arcing protection

7. Available in SOP16 package, RoHS compliant
Other data sheets are available within the file: OB-3309, OB3309RP, OB3309QP, OB3309QPA

OB3309 Datasheet PDF Download

OB3309 pdf