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OB3328 High Performance CCFL Controller Full Bridge On-Bright
On-Bright Electronics  On-Bright
OB3328 Datasheet PDF : 14 Pages
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OB3328/OB3328N
High Performance CCFL Controller Full Bridge
General Description
The OB33 28 is available i n DIP-16, S OP-16 a nd
The OB3328 is a unique, high-efficiency and high- TSSOP-16 Packages.
precision Cold Cathode Fluorescent Lamp (CCFL) Features
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
e (LCD) applications.
fid 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.
a The OB332 8 provides a high deg ree of design
n flexibility by offering great program mability for key
parameters which incl ude operating frequency,
o striking frequ ency, st riking time, bu rst dimming
B frequency, soft-start time, and soft on/o ff time for
burst dimming.
to 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)
l dimming methods are available for a wide range of
tia 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.
n The highly integrated OB3 328 provid es complet e
e protection fe atures covering IC un der voltage
lockout (UVL O), output o ver voltage prote ction,
fid and lamp fail safe function.
Typical Application Circuit
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.
n VIN
t Co GND
h +5V
rig ADIM
-BDDIM
On ENA
9
GA TE-P1
GA TE-N2
8
10
GA TE-N1
GA TE-P2
7
11
VDDA
GND 6
12
BF/DMOD
RI
5
13
ADIM
VS
4
14
DDIM
ST IME
3
15
ENA
CMP/S ST
2
16
RT
CS
1
CCFL
OB 3328
Figure1: OB3328 Typical Application Schematic
© On-Bright Electronics
-1-
Confidential
OB_DO C_DS_2800
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