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DT8211 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 DT8211
기능 LCD Back Light Inverter Drive IC
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DT8211 데이터시트, 핀배열, 회로
DMB Technology
DT8211
LCD Back Light Inverter Drive IC
DT8211
LCD Back Light Inverter Drive IC
Rev1.1 11 July 2008
1. General description
2. Features
The DT8211 is a LCD backlight inverter controller for driving CCFL (Cold Cathode
Fluorescent Lamp). It drives a half bridge topology symmetrically and provides a
near sinusoidal current waveform. It operates at a single-stage topology, constant
frequency PWM (Pulse Width Modulation) mode. The MaxDuty technique achieves
the maximum duty ratio of about 48% and hence can provide better efficiency. A
typical operating frequency ranges from 30kHz to 300kHz, depending on the CCFL
and transformer characteristics. Features such as OLP (Open Lamp Protection) and
SCP (Short Circuit Protection) functions are included. It is available in 18-pin SOPW.
n High Efficiency Single Stage Power Conversion
n P- and N-channel MOSFET Driver Included
n Wide Input Supply Voltage Range from 7.5V to 45V
n Maximum Duty ratio of 48%
n Extremely Low Number of External Components
n Extremely Small Size of Board
n Constant Frequency PWM Operation
n High Precision Oscillator
n Analog and Burst Dimming Function Simultaneously
n Analog Dimming Polarity Selectable
n Burst Dimming Polarity Selectable
n Open Lamp Protection Circuit Included
n Output Short Circuit Protection Circuit Included
n 18 Pin SOPW
3. Applications
n LCD Backlight Inverter
n EEFL Inverter
n FFL Inverter
n Advertisement Board
Rev1.111 July 2008
© 2007 DMB Tech. All Rights Reserved
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DT8211 pdf, 반도체, 판매, 대치품
DMB Technology
DT8211
LCD Back Light Inverter Drive IC
7. Absolute maximum ratings
If Military/Aerospace specified devices are required, please contact the DMB technology Sales
Office/Distributors for availability and specifications.
Parameter
Supply Voltage
Power Dissipation
Operating Ambient Temperature
Operating Junction Temperature
Thermal Resistance Junction to Ambient
Storage Temperature
Symbol
VCC
PD
TA
TJ
θJA
TSTG
Value
45
1.9
-30~+85
-30~+150
66.6
-40~+125
Unit
V
W
°C
°C
°C/W
°C
8. Electrical characteristics
TA = 25°C, VCC = 15V, unless otherwise specified
Parameter
Reference section
Reference Voltage
Max VREF Current
Voltage Error amplifier section
V. Amp. Transconductance
Feedback reference Voltage
Output Clamp Voltage
Maximum Sinking Current
Maximum Sourcing Current
High VFB Sinking Current
Current Error amplifier section
I. Amp. Transconductance
Max. Feedback Ref. Voltage
Maximum Sinking Current
Maximum Sourcing Current
Symbol
VREF
IREF
GmV
VV,REF
VV,CLMP
IV,SNK
IV,SRC
IV,SNKH
GmI
VI,MAX
II,SNK
II,SRC
Conditions
when VFB > 2.5V
Min Typ
5.85 6.0
30
24 30
1.94 2.0
3.05 3.2
14 20
14 20
70 150
120 150
1.94 2.0
70 100
70 100
Max Unit
6.15
V
mA
36 uS
2.06 V
3.35 V
26 μA
26 μA
200 μA
180 uS
2.06 V
130 μA
130 μA
Rev1.111 July 2008
© 2007 DMB Tech. All Rights Reserved
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DT8211 전자부품, 판매, 대치품
DMB Technology
DT8211
LCD Back Light Inverter Drive IC
10. Functional Description (Continued)
Striking Frequency
Striking frequency is generated by increasing charging and discharging current of a
capacitor (CT). RTS pin is normally high impedance, but it goes low when DT8211 is
in striking mode. If a resistor is connected between RTS and RT, a striking frequency
can be generated by increased current and the equation is as below.
fStriking
[Hz]
=
0.228(RT
RT RTS
+ RTS
CT
)
Burst Frequency Oscillator
To generate clear PWM pulse, DT8211 includes a precise triangular waveform
generator circuit. The voltage of RT pin is fixed at 2.0V and the current of RT pin is
flow through the resistor which is connected between RT pin and GND. This current
makes charging and discharging current of a capacitor which is connected to CTB pin
and GND. Triangular wave is generated at CTB pin by charging and discharging
(repeated operation) to this capacitor. This triangular wave is one of reference signal
to generate PWM. The frequency of triangular wave can be calculated approximately
as below.
fBurst [Hz]
=
0.11
RT CTB
Analog Dimming
DT8211 includes three kinds of dimming method. One is analog dimming, burst
dimming and pulse dimming. Analog dimming command feeds DC level to ADIM pin
which is a positive input of internal error amplifier. When 0V<VADIM<2.0V, DT8211
operates in positive polarity mode, but when 3.0V<VADIM<5.0V, DT8211 operates in
negative polarity mode as below figure.
The negative input of error amplifier for current is IFB pin, and control loop is
operated to make IFB level equal to ADIM level. The output of error amplifier for
current, which is ICMP pin, is directly connected to main PWM generator.
Rev1.111 July 2008
© 2007 DMB Tech. All Rights Reserved
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DT8211

Application

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DT8211

LCD Back Light Inverter Drive IC

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