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參數(shù)資料
| 型號： | DS3994 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 4-Channel Cold-Cathode Fluorescent Lamp Controller |
| 中文描述： | 4通道冷陰極熒光燈控制器 |
| 文件頁數(shù)： | 9/28頁 |
| 文件大?。?/td> | 557K |
| 代理商： | DS3994 |
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D
4-Channel Cold-Cathode
Fluorescent Lamp Controller
_____________________________________________________________________
9
GATE
DRIVERS
MOSFET
GATE
DRIVERS
GAn
GBn
DIGITAL
CCFL
CONTROLLER
CHANNEL FAULT
512 x LAMP FREQUENCY
[10.24MHz ~ 40.96MHz]
LAMP FREQUENCY
[20kHz ~ 80kHz]
DIMMING PWM SIGNAL
CHANNEL ENABLE
1.0V
LCMn
LAMP CURRENT
MONITOR
400mV
2.0V
LAMP OVERCURRENT
LAMP STRIKE AND REGULATION
LOC BIT IN CR1.0
LAMP OUT
1.0V
OVDn
OVERVOLTAGE DETECTOR
LAMP MAXIMUM VOLTAGE REGULATION
64 LAMP CYCLE
INTEGRATOR
OVERVOLTAGE
Figure 1. Per Channel Logic Diagram
Detailed Description
The DS3994 uses a push-pull drive scheme to convert
a DC voltage (5V to 24V) to the high-voltage (600V
RMS
to 1200V
RMS
) AC waveform that is required to power
the CCFLs. The push-pull drive scheme uses a minimal
number of external components, which reduces
assembly cost and makes the printed circuit board
design easy to implement. The push-pull drive scheme
also provides an efficient DC-to-AC conversion and
produces near-sinusoidal waveforms.
Each DS3994 channel drives two logic-level n-channel
MOSFETs that are connected between the ends of a
step-up transformer and ground (see Figure 1 and the
Typical Operating Circuit
). The transformer has a center
tap on the primary side that is connected to a DC voltage
supply. The DS3994 alternately turns on the two
MOSFETs to create the high-voltage AC waveform on the
secondary side. By varying the duration of the MOSFET
turn-on times, the controller is able to accurately control
the amount of current flowing through the CCFL.
A resistor in series with the CCFL
’
s ground connection
enables current monitoring. The voltage across this
resistor is fed to the lamp current monitor (LCM) input
on the DS3994. The DS3994 compares the peak resistor
voltage against an internal reference voltage to deter-
mine the duty cycle for the MOSFET gates. Each CCFL
receives independent current monitoring and control,
which results in equal brightness across all of the lamps
and maximizes the lamp
’
s brightness and lifetime.
The DS3994 can also drive more than one lamp per
channel. See the
Typical Operating Circuit
section for
implementation details when using multiple lamps per
channel.
EEPROM Registers and I
2
C-Compatible
Serial Interface
The DS3994 uses an I
2
C-compatible serial interface for
communication with the on-board EEPROM configuration
registers and user memory. The configuration registers,
four Burst Dimming Stagger Registers (BDS1/2/3/4), and
three Control Registers (CR1/2/3)
—
allow the user to cus-
tomize many DS3994 parameters such as the time delay
to stagger the burst dimming between channels, the
lamp and dimming frequency sources, fault-monitoring
options, and channel enabling/disabling. The three bytes
of nonvolatile user memory can be used to store manu-
facturing data such as date codes, serial numbers, or
product identification numbers.
The device is shipped from the factory with the con-
figuration registers programmed to a set of default
configuration parameters. To inquire about custom
factory programming, please send an email to
MixedSignal.Apps@dalsemi.com.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS3994Z+ | 功能描述:顯示驅(qū)動器和控制器 4-Ch CCFL Controller RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| DS3994Z+T&R | 制造商:Maxim Integrated Products 功能描述:2ND GEN 4CH CCFL CON SOIC-28 T&R LF - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC CCFL CNTRLR 4CH 28-SOIC |
| DS3994Z+T&R | 功能描述:顯示驅(qū)動器和控制器 4-Ch CCFL Controller RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| DS3994Z+W | 功能描述:顯示驅(qū)動器和控制器 4-Ch CCFL Controller RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| DS3CC | 制造商:Thomas & Betts 功能描述:30A,MG,CUP CAP |
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