OB3309 Datasheet PDF - On-Bright

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OB3309
On-Bright

Part Number OB3309
Description Highly Integrated U Type CCFL Backlight Controller
Page 12 Pages


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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



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OB3309
Highly Integrated U Type CCFL Backlight Control
Absolute Maximum Ratings
Parameter
VDD Input Voltage to GND
CS to GND
I/O to GND
Operating Ambient Temp. TA
Operating Junction Temp. TJ
Min/Max Storage Temp. Tstg
Lead Temp. (10 Sec)
Value
7V
-1.5V to
VDD+0.3V
-0.3V to
VDD + 0.3V
-20 oC ~ 85oC
150oC
-55 oC ~150oC
260 oC
Note: Stresses beyond those listed under “absolute maximum
ratings” may cause permanent damage to the device. These
are stress ratings only, functional operation of the device at
these or any other conditions beyond those indicated under
“recommended operating conditions” is not implied. Exposure
to absolute maximum-rated conditions for extended periods
may affect device reliability.
Recommended Operating Range
Parameter
VDD Voltage
Operating Frequency
Value
4.5V to 5.5V
30K to 150KHz
Package Thermal Characteristics
Parameter
Value
Thermal resistance θJA (SOP) 85 oC /W
Ordering Information
Part Number
OB3309QP
OB3309QPA
Description
SOP16, pb-free in tube
SOP16, pb-free in T&R
Package Marking Information
©On-Bright Electronics
Confidential
-2-
Preliminary Datasheet
OB_DOC_DS_330900



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Pin Configuration
OB3309
Highly Integrated U Type CCFL Backlight Control
Terminal Assignment
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin Name
ENA
RI
RT
DRC
BF/DMOD
POL
VDD
GATE 1
GATE 2
GND
VS
PRT
CS
CMP
STIME
DIM
I/O
Input
I/O
I/O
Input
I/O
Input
Power
Output
Output
Ground
Input
Input
Input
I/O
I/O
Input
Pin Function
Enable control input, active high
Connected an external resistor to ground to set striking frequency (No
Floating)
Connected an external resistor to ground to set operation frequency
Dimming range setting.
Connect 0.2V to 2V DC voltage can set minimum burst duty from 100%
to 0% for bust dimming;
Connect 0V to 1.25V DC voltage can set minimum Vref_ea from 0V to
1.25V for analog dimming;
Connected to VDD to set analog dimming mode
Connected to GND to set external LPWM dimming mode
Connect an external capacitor to GND to set internal burst dimming
mode. The burst mode frequency is determined by the external capacitor
PWM Dimming polarity selection :
POL<2V: Negative analog / burst mode , positive LPWM dimming
POL>2V: Positive burst mode , negative analog / LPWM dimming
+5V Power supply
Output drive
Output drive
Power ground
Lamp voltage feedback
Lamp fault detection
Lamp current feedback
Loop compensation and soft start time setting
Connect an external capacitor to GND to set striking time
Dimming signal input
©On-Bright Electronics
Confidential
-3-
Preliminary Datasheet
OB_DOC_DS_330900



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Functional Block Diagram
OB3309
Highly Integrated U Type CCFL Backlight Control
Figure2. OB3309 Functional Block Diagram
©On-Bright Electronics
Confidential
-4-
Preliminary Datasheet
OB_DOC_DS_330900



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