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参数资料
| 型号： | DS3988T+T&R |
| 厂商： | Maxim Integrated |
| 文件页数： | 9/23页 |
| 文件大小： | 0K |
| 描述： | IC CCFL CNTRLR 8CH 48TQFP |
| 标准包装： | 2,000 |
| 类型： | CCFL 控制器 |
| 频率： | 40 ~ 80 kHz |
| 电流 - 电源： | 15mA |
| 电源电压： | 4.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 48-LQFP |
| 供应商设备封装： | 48-LQFP（7x7） |
| 包装： | 带卷 (TR) |
8-Channel Cold-Cathode
Fluorescent Lamp Controller
1 OF 8 CHANNELS
LAMP OUT
CHANNEL ENABLE
256 LAMP CYCLE
400mV
DS3988
CHANNEL FAULT
INTEGRATOR
LAMP OVERCURRENT
LSE BIT AT CR1.0
2.0V
PEAK
DETECT/
HOLD
LCM
LAMP CURRENT
MONITOR
DPWM SIGNAL
DIGITAL
CCFL
LAMP REGULATION
1.0V
512 x LAMP FREQUENCY
[20.48MHz TO 40.96MHz]
CONTROLLER
PHASED LAMP FREQUENCY
[40kHz TO 80kHz]
256 LAMP CYCLE
INTEGRATOR
OVERVOLTAGE
1.0V
PEAK
DETECT
OVD
OVERVOLTAGE
DETECTION
Figure 1. Per Channel Logic Diagram
GATE
DRIVERS
G A
G B
MOSFET
GATE
DRIVERS
Detailed Description
The DS3988 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 (PC
board) design easy to implement. The push-pull drive
scheme also provides an efficient DC-to-AC conversion
and produces near-sinusoidal waveforms.
Each DS3988 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 cen-
ter tap on the primary side that is connected to a DC
voltage supply. The DS3988 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 accu-
rately 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 DS3988. The DS3988 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.
EEPROM Registers and I 2 C-Compatible
Serial Interface
The DS3988 uses an I 2 C-compatible serial interface for
communication with the on-board EEPROM configura-
tion registers and user memory. The configuration regis-
ters—four Soft-Start Profile registers (SSP1/2/3/4) and
two Control Registers (CR1/2)—allow the user to cus-
tomize many DS3988 parameters such as the soft-start
ramp rate, the lamp and dimming frequency sources,
fault-monitoring options, and channel enabling/disabling.
The eight bytes of nonvolatile user memory can be used
to store manufacturing data such as date codes, serial
numbers, or product identification numbers.
The device is shipped from the factory with the configu-
ration registers programmed to a set of default configu-
ration parameters. To inquire about custom factory
programming, email MixedSignal.Apps@dalsemi.com.
_____________________________________________________________________
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS3991 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Low-Cost CCFL Controller |
| DS3991V | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Low-Cost CCFL Controller |
| DS3991VC | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Low-Cost CCFL Controller |
| DS3991VR | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Low-Cost CCFL Controller |
| DS3991VRC | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Low-Cost CCFL Controller |
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