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参数资料
| 型号： | DS3882E+T&R/C |
| 厂商： | Maxim Integrated |
| 文件页数： | 10/31页 |
| 文件大小： | 0K |
| 描述： | IC AUTO CCFL CTRLR 2CH 28-TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1,000 |
| 类型： | CCFL 控制器 |
| 频率： | 40 ~ 100 kHz |
| 电流 - 电源： | 12mA |
| 电源电压： | 4.75 V ~ 5.25 V |
| 工作温度： | -40°C ~ 105°C |
| 封装/外壳： | 28-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 28-TSSOP |
| 包装： | 带卷 (TR) |
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Dual-Channel Automotive CCFL Controller
Functional Diagrams (continued)
LAMP OUT
300mV
CHANNEL ENABLE
LCMn
CHANNEL FAULT
DIGITAL
LAMP OVERCURRENT
LOCE BIT IN CR1.0
2.5V
LAMP CURRENT
MONITOR
CCFL
CONTROLLER
LAMP STRIKE AND REGULATION
DIMMING PWM SIGNAL
64 LAMP CYCLE
INTEGRATOR
OVERVOLTAGE
V LRT (1.0V NOMINAL)
OVDn
512 X LAMP FREQUENCY
[20.48MHz ~ 51.20MHz]
LAMP MAXIMUM VOLTAGE REGULATION
1.0V
OVERVOLTAGE DETECTOR
LAMP FREQUENCY
[40kHz ~ 80kHz]
GATE
DRIVERS
GAn
GBn
MOSFET
GATE
DRIVERS
Figure 2. Per Channel Logic Diagram
Detailed Description
The DS3882 uses a push-pull drive scheme to convert
a DC voltage (8V to 16V) to the high-voltage (300V RMS
to 1000V RMS ) AC waveform that is required to power
the CCFLs. The push-pull drive scheme uses a minimal
number of external components, which reduces assem-
bly 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 pro-
duces near-sinusoidal waveforms.
Each DS3882 channel drives two logic-level n-channel
MOSFETs that are connected between the ends of a
step-up transformer and ground (see the Typical
Operating Circuit). The transformer has a center tap on
the primary side that is connected to a DC voltage sup-
ply. The DS3882 alternately turns on the two MOSFETs
to create the high-voltage AC waveform on the sec-
ondary side. By varying the duration of the MOSFET
turn-on times, the CCFL current is able to be accurately
controlled.
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
and compared to an internal reference voltage to deter-
mine the duty cycle for the MOSFET gates. Each CCFL
receives independent current monitoring and control,
which maximizes the lamp’s brightness and lifetime.
Block diagrams of the DS3882 are shown in Figures 1
and 2. More operating details of the DS3882 are dis-
cussed on the following pages of this data sheet.
Memory Registers and
I2C-Compatible Serial Interface
The DS3882 uses an I 2 C-compatible serial interface for
communication with the on-board EEPROM and SRAM
configuration/status registers as well as user memory.
The configuration registers, which are a mixture of
shadowed EEPROM and SRAM, allow the user to cus-
tomize many DS3882 parameters such as the soft-start
ramp rate, the lamp and dimming frequency sources,
brightness of the lamps, fault-monitoring options, chan-
nel enabling/disabling, EMI control, and lamp current
overdrive control. The eight bytes of NV user memory
can be used to store manufacturing data such as date
codes, serial numbers, or product identification num-
bers. The device is shipped from the factory with the
configuration registers programmed to a set of default
configuration parameters. To inquire about custom pro-
gramming, contact the factory.
10
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