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OB3328N Datasheet

High Performance CCFL Controller

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OB3328/OB3328N
High Performance CCFL Controller Full Bridge
General Description
The OB3328 is a unique, high-efficiency and high-
precision Cold Cathode Fluorescent Lamp (CCFL)
backlight co ntroller IC d edicated to full bridg e
configuration. The controller i s de signed to drive
single or multiple CCF Ls in Liquid Cryst al Display
(LCD) applications.
The OB332 8 convert s unre gulated DC input
voltage to the pure sin usoidal voltage and cu rrent
waveforms i n requi red freque ncy, to ignite and
operate CCFL lamps.
The OB332 8 provides a high deg ree of design
flexibility by offering great program mability for key
parameters which incl ude operating frequency,
striking frequ ency, st riking time, bu rst dimming
frequency, so ft-start time, and soft on/o ff time for
burst dimming.
The OB332 8 offers variab le dimming mode s and
selectable di mming pol arity1. Both internal burs t
and externa l low frequ ency PWM (LPWM)
dimming methods are available for a wide range of
dimming control (10% to 100%). Fu rthermore,
analog dimmi ng is provide d thro ugh external DC
input control to achi eve 40% to 100 % dimmin g
range.
The highly integrated OB3 328 provid es complet e
protection fe atures covering IC un der voltage
lockout (UVL O), output o ver voltage prote ction,
and lamp fail safe function.
Typical Application Circuit
The OB33 28 is available i n DIP-16, S OP-16 a nd
TSSOP-16 Packages.
Features
z Support wide input voltage
z Full bridge topology
z High precision reference and frequency control
z Built-in peak detect circuit reduces BOM count
z Support single or multi-lamp applications
z High flexibility of dimming configuration:
Analog Dimming
Internal/external burst (PWM) mode dimming
Concurrent burst and analog dimming control
z Flexible user programmability:
Operating frequency
Striking frequency, striking voltage and time
Soft start and soft on/off time
Internal burst mode frequency
z Comprehensive protection coverage:
IC supply under voltage lockout (UVLO)
Output over voltage protection (OVP)
Lamp fail safe function
Applications
z Notebook computer
z LCD Monitor
z LCD TV
z LCD flat panel display for Instrument, automobile
and handhold device
1 The OB3328 is with positive dimming polarity while its
counter part OB3328N is in negative dimming polarity.
VIN
GND
+5V
ADIM
DDIM
ENA
9 GA TE-P1 GA TE-N2
10 GA TE-N1 GA TE-P2
11 VDDA
GND
12 BF/DMOD
RI
13 ADIM
VS
14 DDIM
ST IME
15 ENA
CMP/S ST
16 RT
CS
OB 3328
8
7
6
5
4
3
2
1
Figure1: OB3328 Typical Application Schematic
© On-Bright Electronics
-1-
CCFL
Confidential
OB_DO C_DS_2800
http://www.Datasheet4U.com
On-Bright
On-Bright



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