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OB3309 Datasheet

Highly Integrated U Type CCFL Backlight Controller

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OB3309
Highly Integrated U Type CCFL Backlight Controller
Product Specification
GENERAL DESCRIPTION
OB3309 is a highly integrated and high
performance U-type Cold Cathode Fluorescent
Lamp (CCFL) controller optimized for LCD display
backlight application. Comprehensive protection
functions are integrated, thus it provides a cost
effective yet high reliability LCD backlight solution.
Operating in push pull configuration, OB3309
converts DC input voltage to the pure sinusoidal
voltage and current waveforms, to ignite and
operate CCFL lamps.
It provides a high degree of design flexibility by
offering great programmability for key parameters
which include operating frequency, striking
frequency, striking time, dimming polarity, burst
dimming frequency, soft-start time, and soft on/off
time for burst dimming.
Various dimming modes control and dimming
polarity programmability are offered. Both internal
burst and external low frequency PWM (LPWM)
dimming methods are available for a wide range of
dimming control. Analog dimming is also provided
through external DC input control to achieve wide
dimming range.
The highly integrated OB3309 provides complete
protection features covering output over voltage,
over output current protection, lamp fail safe
function, and IC under voltage lockout.
The OB3309 is available in SOP-16 Packages.
TYPICAL APPLICATION
FEATURES
„ High performance push pull topology
„ Optimized for U type CCFL solution
„ Adjustable dimming polarity
„ Adjustable striking frequency & time
„ Flexible Dimming mode Control:
| Analog dimming control
| Internal burst dimming control
| External burst (LPWM) dimming control
„ Adjustable minimum duty for internal burst
dimming
„ Adjustable minimum reference voltage for
analog dimming
„ 0-2V DC voltage direct dimming control
without external circuits
„ Comprehensive Protection Coverage:
| Output over voltage protection (OVP)
| Output over current protection (OCP)
| Open lamp protection and short lamp
protection
| Arcing protection
APPLICATIONS
„ LCD Monitor
„ LCD TV
„ Flat panel display
VIN
DIM
ENA
+5V
GND
1 ENA
2 RI
3 RT
4 DRC
5 BF/DMOD
6 POL
7 VDD
8 GATE1
DIM 16
STIME 15
CMP 14
CS 13
PRT 12
VS 11
GND 10
GATE2 9
OB3309
PRT
VS
PRT
VS
VS
Figure1. OB3309 Typical Application Schematic
©On-Bright Electronics
Confidential
-1-
Preliminary Datasheet
OB_DOC_DS_330900
On-Bright
On-Bright



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