参数资料
| 型号： | DS3992Z-09N+T&R |
| 厂商： | Maxim Integrated |
| 文件页数： | 9/13页 |
| 文件大小： | 0K |
| 描述： | IC CCFL CNTRLR 2CH 16-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | CCFL 控制器 |
| 频率： | 40 ~ 80 kHz |
| 电流 - 电源： | 8mA |
| 电源电压： | 4.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 带卷 (TR) |
Two-Channel, Push-Pull CCFL Controller
DEVICE AND
INVERTER SUPPLIES
AT PROPER LEVELS?
YES
STRIKE LAMP
[RAMP AND REGULATE TO
OVD THRESHOLD]
IF LINE REGULATION
THRESHOLD IS MET
RUN LAMP
LAMP STRIKE TIMEOUT
[65536 LAMP CYCLES]
OVERVOLTAGE
[64 LAMP CYCLES]
FAULT STATE
[MUST POWER CYCLE THE DS3992
OR TAKE SVM BELOW 2V TO RESET
THE CCFL CONTROLLER]
LAMP OVERCURRENT
[INSTANTANEOUS]
[REGULATE LAMP
CURRENT BOUNDED BY
LAMP-OUT TIMEOUT
[65,536 LAMP CYCLES]
LAMP VOLTAGE]
MOSFET GATE DRIVERS ENABLED
RUN LAMP STAGE
Figure 4. Fault-Handling Flowchart
When both the DS3992 and the DC inverter supplies
are at acceptable levels, the DS3992 will attempt to
strike the lamps. The DS3992 slowly ramps up the
MOSFET gate duty cycle until the lamp strikes. The
controller detects that the lamp has struck by detecting
current flow in the lamp. If during the strike ramp, the
maximum allowable voltage is reached, the controller
will stop increasing the MOSFET gate duty cycle to
keep from overstressing the system. The DS3992 will
go into a fault-handling state if the lamp has not struck
after 65,536 lamp cycles. If an overvoltage event is
detected during the strike attempt, the DS3992 will dis-
able the MOSFET gate drivers and go into the fault-
handling state.
Once the lamp is struck, the DS3992 moves to the run
lamp stage. In the run lamp stage, the DS3992 adjusts
the MOSFET gate duty cycle to optimize the lamp cur-
rent. The gate duty cycle is always constrained to keep
the system from exceeding the maximum allowable
lamp voltage. If lamp current ever drops below the
lamp out reference point for 65536 lamp cycles, then
the lamp is considered extinguished. In this case the
MOSFET gate drivers are disabled and the device
moves to the fault handling stage.
In the case of a lamp overcurrent condition, the
DS3992 will instantaneously declare the controller to be
in a fault state. If either channel on the DS3992 goes
into the fault state, only the faulty channel will be shut
down. Once a fault state is entered, the controller will
remain in that state until one of the following occurs:
? V CC drops below the UVLO threshold.
? The SVM input drops below 2.0V.
Applications Information
Component Selection
External component selection has a large impact on the
overall system performance and cost. The two most
important external components are the transformers
and n-channel MOSFETs.
The transformer should be able to operate in the 40kHz
to 80kHz frequency range of the DS3992, and the turns
ratio should be selected so the MOSFET drivers run at
28% to 35% duty cycle during steady-state operation.
The transformer must be able to withstand the high
open-circuit voltage that will be used to strike the lamp.
Additionally, its primary/secondary resistance and
inductance characteristics must be considered
because they contribute significantly to determining the
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS3992Z-09P | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Two-Channel, Push-Pull CCFL Controller |
| DS3992Z-09P+ | 功能描述:显示驱动器和控制器 2Ch Push-Pull CCFL Controller RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| DS3992Z-09P+R | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Two-Channel, Push-Pull CCFL Controller |
| DS3992Z-09P+T | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Two-Channel, Push-Pull CCFL Controller |
| DS3992Z-09P+T&R | 制造商:Maxim Integrated Products 功能描述: 制造商:Maxim Integrated Products 功能描述:CCFL DRVR 5.5V 16SOIC - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC CCFL CNTRLR 2CH 16-SOIC |
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