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PDF OB3328N Data sheet ( Hoja de datos )
| Número de pieza | OB3328N | |
| Descripción | High Performance CCFL Controller | |
| Fabricantes | On-Bright | |
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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
1 page  
Functional Block Diagram
OB3328/OB3328N
High Performance CCFL Controller Full Bridge
CS 1
CMP/SST 2
STIME 3
VS 4
RI 5
GND 6
GATE-P2 7
Peak
Detect
V_ref_dim +
EA
-
PWM
Generator
HF OSC
CS_th -
+
3.0uA
Lamp Fail
Safe
Functions
+
V_th -
Peak
Detect
Input Logic
RI
Striking Control
GND
Soft Switching & Output Control
CLK RI
V_ref_dim
Analog & Burst
Dimming
POR
VDD UVLO
Bandgap/
Reference
V_ref I_ref PG
16 RT
15 ENA
14 DDIM
13 ADIM
12 BF/DMOD
11 VDDA
10 GATE-N1
GATE-N2 8
Gate Driver
Figure2: OB3328 Functional Block Diagram
9 GATE-P1
© On-Bright Electronics
-5-
Confidential
OB_DO C_DS_2800
5 Page 
OB3328/OB3328N
High Performance CCFL Controller Full Bridge
Package Mechanical Data: DIP16
Symbol
A
A1
A2
B
B1
C
D
E
E1
e
L
E2
Dimensions In Millimeters
Min Max
3.710 4.310
0.510
3.200 3.600
0.380 0.570
1.524 (BSC)
0.204 0.360
18.800 19.200
6.200 6.600
7.320 7.920
2.540 (BSC)
3.000 3.600
8.400 9.000
Dimensions In Inches
Min Max
0.146
0.170
0.020
0.126
0.142
0.015
0.022
0.060 (BSC)
0.008
0.014
0.740
0.756
0.244
0.260
0.288
0.312
0.100 (BSC)
0.118
0.142
0.331
0.354
© On-Bright Electronics
- 11 -
Confidential
OB_DO C_DS_2800
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet OB3328N.PDF ] | |
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