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OB3328N Schematic ( PDF Datasheet ) - On-Bright

Teilenummer OB3328N
Beschreibung High Performance CCFL Controller
Hersteller On-Bright
Logo On-Bright Logo 




Gesamt 14 Seiten
OB3328N Datasheet, Funktion
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






OB3328N Datasheet, Funktion
OB3328/OB3328N
High Performance CCFL Controller Full Bridge
Electrical Characteristics
VDDA=5V, ENA=5V, RT=36Kohm, RI=107Kohm, ADIM=DDIM=5V, CBF=10nF, CSTIME = 1uF, TA=25oC if
not otherwise noted.
Parameter Sy
mbol Condition
Min Typ Max Units
Current Consumption
IC Standby
Normal operating
VDDA UVLO
Istandby ENA=0V
IVDD
- 5 20 uA
-4
mA
UVLO on
3.6 V
UVLO off
4.4 V
High Frequency Oscillator
Operating frequency
Striking frequency
Temp. stability
FOP
FSTK
TA = -20 oC to 85 oC
48 50 52
62 65 68
- 200
-
KHz
KHz
PPM/ oC
Min. (overlap) duty cycle
1%
Max. (overlap) duty cycle
45%
Low Frequency Oscillator for Burst Mode Dimming
Burst frequency
Temp. stability
Min. burst duty
Max. burst duty
Analog Dimming Control
OB3328 DDIM =0V
OB3328N DDIM=0V
OB3328 DDIM >3V
OB3328N DDIM>3.25
180 200 220
- 400 -
- 10 -
100
- 100 -
10
Hz
PPM/ oC
%
%
Min. CS reference Voltage
V_ref_dim ADIM=
Max. CS reference Voltage
V_ref_dim ADIM>
External LPWM Dimming Control
0V
3V
- 0.5 -
- 1.25 -
V
V
External LPWM duty
10 -
100 %
External LPWM Logic input level
high
low
2.0
0.8
V
V
Error Amplifier
Reference voltage
VREF_PK
1.2 1.25 1.3 V
© On-Bright Electronics
-6-
Confidential
OB_DO C_DS_2800

6 Page









OB3328N pdf, datenblatt
OB3328/OB3328N
High Performance CCFL Controller Full Bridge
Package Mechanical Data: SOP16
Symbol
A
A1
A2
B
C
D
E
E1
e
L
ө
Dimensions In Millimeters
Min Max
1.350 1.750
0.100 0.250
1.350 1.550
0.330 0.510
0.190 0.250
9.800 10.000
3.800 4.000
5.800 6.300
1.270 (TYP)
0.400 1.270
0o
8o
Dimensions In Inches
Min Max
0.053
0.069
0.004
0.010
0.053
0.061
0.013
0.020
0.007
0.010
0.386
0.394
0.150
0.157
0.228
0.248
0.050 (TYP)
0.016
0o
0.050
8o
© On-Bright Electronics
- 12 -
Confidential
OB_DO C_DS_2800

12 Page





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