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부품번호 OB3328 기능
기능 High Performance CCFL Controller
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OB3328 데이터시트, 핀배열, 회로
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




OB3328 pdf, 반도체, 판매, 대치품
Pin Configuration
CS 1
CMP/SST 2
STIME 3
VS 4
RI 5
GND 6
GATE-P2 7
GATE-N2 8
OB3328/OB3328N
High Performance CCFL Controller Full Bridge
16 R T
15 ENA
14 DDIM
13 ADIM
12 BF/DMO D
11 VDDA
10 GA TE-N1
9 GA TE-P1
Terminal Assignment
Pin Number Pin Name I/O
1 CS Input
2 CMP/SST
I/O
3
STIME
I/O
4 VS Input
Pin Function
Lamp current sense input
Connected to Loop com pensation ca pacitor, this cap acitor
also sets the soft start time
Connect to a capacitor to set striking time
Output voltage sense input
5 RI I/O Connected to resistor setting strike frequency
6 GND
7
8
9
10
11
Ground
GATE-P2 Output
GATE-N2 Output
GATE-P1 Output
GATE-N1 Output
VDDA
Power
12 BF/DMOD
I/O
13
ADIM
Input
14
DDIM
Input
15
ENA
Input
16 RT I/O
Ground
P-MOSFET gate drive output2
N-MOSFET gate drive output2
P-MOSFET gate drive output1
N-MOSFET gate drive output1
+5V power supply
Connected to capacitor sets Burst frequency or connected to
GND selects external LPWM mode dimming
DC signal input for analog mode dimming
Digital mode dimming control signal input
Chip enable control input, active high
Connected to an external resistor sets operating frequency
© On-Bright Electronics
-4-
Confidential
OB_DO C_DS_2800

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OB3328 전자부품, 판매, 대치품
OB3328/OB3328N
High Performance CCFL Controller Full Bridge
Parameter Sy
mbol Condition
Open loop voltage gain
Unity gain bandwidth
CMP=39nF
Supply Current
Soft start current
ISST
Soft on/off current
ISOFT
Striking timer current
ISTIME
Control and Protection Threshold
Enable threshold
ON 0.8
OFF
VS regulate voltage
VSPK Whe
n striking
Over voltage protection
Lamp fail safe protection
VSPK Normal
VCS_PK
Operating
Lamp fail safe deglitch time
Striking timer threshold
VSTIME
Striking completion threshold
VCS_PK
Gate Driver Output
GATE-N1/ GATE-N2
RON
IOUT=70mA
GATE-P1/ GATE-P2
RON
IOUT=70mA
Gate Driver Dead Time
GATE-N1/GATE-P1
CMP=2V
GATE-N2/GATE-P2
CMP=2V
Min Typ Max
70 -
250
Units
dB
Hz
3.0
120
- 3.0 -
uA
uA
uA
2.0
3.0
3.0
200
20
3.0
300
V
V
V
mV
mS
V
mV
8 ohm
8 ohm
400 nS
400 nS
© On-Bright Electronics
-7-
Confidential
OB_DO C_DS_2800

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관련 데이터시트

부품번호상세설명 및 기능제조사
OB3328

High Performance CCFL Controller

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OB3328N

High Performance CCFL Controller

On-Bright
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