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参数资料
| 型号： | DS3991Z+T&R/PP |
| 厂商： | Maxim Integrated |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR CCFL PUSH-PULL 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： | 5mA |
| 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) |
| 其它名称： | 90-3991V+001 |
Low-Cost CCFL Controller
R 2
V INV
V INV
R 2
V TRIP
SVML
DS3991
SVMH
V TRIP
R 1
2.0V
Figure 2. Setting the SVML and SVMH Threshold Voltages
DEVICE AND
INVERTER SUPPLIES
AT PROPER LEVELS?
YES
STRIKE LAMP
(RAMP AND REGULATE TO
OVD THRESHOLD)
IF LAMP REGULATION
THRESHOLD IS MET
RUN LAMP
2.0V
LAMP STRIKE TIMEOUT
(65,536 LAMP CYCLES)
OVERVOLTAGE
(64 LAMP CYCLES)
R 1
FAULT STATE
(MUST POWER CYCLE THE DS3991
OR TAKE SVML BELOW 2V OR SVMH
ABOVE 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
Figure 3. Fault-Handling Flowchart
causing spurious operation when V CC is near the trip
point. This monitor cannot be disabled by any means.
Fault Monitoring
The DS3991 provides extensive fault monitoring. It can
detect open-lamp, lamp overcurrent, failure to strike,
and overvoltage conditions. Figure 3 shows a flowchart
of how the DS3991 controls and monitors each lamp.
The steps are as follows:
The lamps do not turn on unless the DS3991 supply
voltage is > 4.5V and the voltage at the supply-voltage
monitor low (SVML) input is > 2V and the supply-volt-
age monitor high (SVMH) input is < 2V.
When both the DS3991 and the DC inverter supplies are
at acceptable levels, the DS3991 attempts to strike the
lamps. The DS3991 slowly ramps up the MOSFET gate
duty cycle until the lamp strikes. The controller detects
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS3992 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Two-Channel, Push-Pull CCFL Controller |
| DS3992Z+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| DS3992Z-09N | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Two-Channel, Push-Pull CCFL Controller |
| DS3992Z-09N+ | 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-09N+R | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Two-Channel, Push-Pull CCFL Controller |
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