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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
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OB3328/OB3328N
High Performance CCFL Controller Full Bridge
Absolute Maximum Ratings
Parameter
VDDA Input Voltage to GND
I/O to GND
Operating Ambient
Temperature TA
Operating Junction
Temperature TJ
Min/Max Storage Temperature
Tstg
Lead Temperature (10 Sec)
Value
7V
-0.3 to
VDDA + 0.3V
-20 to 85oC
150oC
-55 to 150oC
260 oC
Note: Stresses beyond those listed under “absolute maximum
ratings” ma y ca use perman ent damage to the device. These
are stress ratings onl y, fu nctional operation of th e device at
these or an y ot her conditions be yond those ind icated under
“recommended operating conditions” is not implied. Exposur e
to absolute maximum-rated con ditions for exten ded periods
may affect device reliability.
Recommended Operating Range
Parameter
VDDA Voltage
Operating Frequency
Value
4.5V to 5.5V
30 to 150KHz
Package Thermal Characteristics
Parameter
Thermal resistance θJA (SOP)
Thermal resistance θJA (DIP)
Ordering Information2
Value
85 oC /W
60 oC /W
Part Number
OB3328RP
OB3328QP
OB3328TP
OB3328NRP
OB3328NQP
OB3328NTP
Description
DIP16, pb-free
SOP16, pb-free
TSSOP16, pb-free
DIP16, pb-free
SOP16, pb-free
TSSOP16, pb-free
2 OB3328N is negative dimming version of OB3328.
Ordering information
OB3328(N) X X X
High Performance CCFL
Controller
Package Package Pb free Packing
Q:SOP16
R:DIP16
T:TSSOP16
Blank:Normal
P:lead-free
Blank:Tube
A: Taping
© On-Bright Electronics
-2-
Confidential
OB_DO C_DS_2800

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OB3328/OB3328N
High Performance CCFL Controller Full Bridge
Package Marking Information
SOP16
LT YWW
OB3328QP
s
Y: Year Code (0-9)
WW: Week Code (1-52)
Q:SOP16
P:lead-free
s: internal code
TSSOP16
LT YWW
OB3328TP
s
Y: Year Code (0-9)
WW: Week Code (1-52)
T:TSSOP16
P:lead-free
s: internal code
DIP16
LT YWW
OB3328RP
s
Y: Year Code (0-9)
WW: Week Code (1-52)
R:DIP16
P:lead-free
s: internal code
© On-Bright Electronics
-3-
Confidential
OB_DO C_DS_2800