参数资料
| 型号： | DS3984T+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 10/24页 |
| 文件大小： | 0K |
| 描述： | IC CCFL CNTRLR 4CH 32-TQFP |
| 标准包装： | 1 |
| 类型： | CCFL 控制器 |
| 频率： | 40 ~ 80 kHz |
| 电流 - 电源： | 12mA |
| 电源电压： | 4.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 32-TQFP |
| 供应商设备封装： | 32-TQFP（7x7） |
| 包装： | 托盘 |
4-Channel Cold-Cathode
Fluorescent Lamp Controller
Channel Phasing
The lamp-frequency MOSFET gate turn-on times are
equally phased among the four channels during the
burst period. This reduces the inrush current that would
result from all lamps switching simultaneously, and
hence eases the design requirements for the DC sup-
ply. Figure 2 details how the four channels are phased.
Note that it is the lamp frequency signals that are
phased, NOT the DPWM signals.
Lamp Dimming Control (DPWM)
The DS3984 uses a digital pulse-width modulated
(DPWM) signal (22.5Hz to 440Hz) to provide efficient
and precise lamp dimming. During the high period of
the DPWM cycle, the lamps are driven at the selected
lamp frequency (40kHz to 80kHz) as shown in Figure 6.
This part of the cycle is called the “burst ” period
because of the lamp frequency burst that occurs dur-
ing this time. During the low period of the DPWM cycle,
the controller disables the MOSFET gate drivers so the
lamps are not driven. This causes the current to stop
flowing in the lamps, but the time is short enough to keep
the lamps from de-ionizing. Dimming is increased/
decreased by adjusting (i.e., modulating) the duty cycle
of the DPWM signal.
The DS3984 can generate its own DPWM signal internally
(set DPSS = 0 in CR1), which can then be sourced to
other DS3984s if required, or the DPWM signal can be
supplied from an external source (set DPSS = 1 in CR1).
4
1
2
3
4
1
2
3
4
1
2
3
4
CHANNEL
SEQUENCE
VARIABLE
GA1
GB1
GA2
GB2
GA3
GB3
GA4
GB4
MOSFET GATE-
DRIVE SIGNALS AT
LAMP FREQUENCY
Figure 2. Channel Phasing Detail
MOSFET
GATE DUTY
CYCLE
DIMMING CLOCK (DPWM)
FREQUENCY
10
____________________________________________________________________
相关PDF资料 |
PDF描述 |
|---|---|
| DS3988T+ | IC CCFL CNTRLR 8CH 48TQFP |
| DS3991Z+T&R/PPV | IC CTRLR CCFL PUSH-PULL 16-SOIC |
| DS3992Z-09N+T&R | IC CCFL CNTRLR 2CH 16-SOIC |
| DS3994Z+T&R | IC CCFL CNTRLR 4CH 28-SOIC |
| DS4303R-U+ | IC VREF SERIES ADJ SOT-23-5 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS3984T+ | 功能描述:显示驱动器和控制器 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 |
| DS3984Z | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:4-Channel Cold-Cathode Fluorescent Lamp Controller |
| DS3984Z+ | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:4-Channel Cold-Cathode Fluorescent Lamp Controller |
| DS3988 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:8-Channel Cold-Cathode Fluorescent Lamp Controller |
| DS3988T | 功能描述:显示驱动器和控制器 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 |
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