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参数资料
| 型号： | DS3881E+C |
| 厂商： | Maxim Integrated |
| 文件页数： | 11/28页 |
| 文件大小： | 0K |
| 描述： | IC CCFL CONTROL 24TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 62 |
| 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： | 24-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 24-TSSOP |
| 包装： | 管件 |
| 其它名称： | DS3881E+ DS3881E+-ND |
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Single-Channel Automotive CCFL Controller
RESISTOR-SET DIMMING CLOCK
EXTERNAL DIMMING CLOCK
ANALOG DIMMING
2.0V
ANALOG DIMMING
2.0V
CONTROL VOLTAGE
DPWM
SIGNAL
0.5V
BRIGHT
PSYNC
CONTROL VOLTAGE
DPWM
SIGNAL
0.5V
BRIGHT
PSYNC
22.5Hz TO 440Hz
POSC
EXTERNAL
22.5Hz TO 440Hz
POSC
EXTERNAL RESISTOR
SETS DPWM RATE
Figure 3. DPWM Source Configuration Options
Analog Dimming
Analog dimming changes the brightness by increasing
or decreasing the lamp current. The DS3881 accom-
plishes this by making small shifts to the lamp regula-
tion voltage, V LRT (see Figure 2). Analog dimming is
only possible by software communication with the lower
five bits (LC4–LC0) in the BLC register. This function is
DPWM CLOCK
22.5Hz TO 440Hz
DPWM RECEIVER
BRIGHT
not pin controllable. The default power-on state of the
LC bits is 00000b, which corresponds to 100% of the
nominal current level. Therefore on power-up, analog
dimming does not interfere with burst dimming func-
DPWM
SIGNAL
22.5Hz TO 440Hz
PSYNC
POSC
tionality if it is not desired. Setting the LC bits to 11111b
reduces the lamp current to 35% of its nominal level. For
LC values between 11111b and 00000b, the lamp cur-
rent varies linearly between 35% and 100% of nominal.
Figure 4. DPWM Receiver Configuration
Lamp Frequency Configuration
The DS3881 can generate its own lamp frequency
clock internally (set LFSS = 0 in CR1), which can then
be sourced to other DS3881s if required, or the lamp
clock can be supplied from an external source (set
LFSS = 1 in CR1). When the lamp clock is internally
generated, the frequency (40kHz to 100kHz) is set by
an external resistor at the LOSC. In this case, the
DS3881 can act as a lamp frequency source because
the lamp clock is output at the LSYNC I/O pin for syn-
chronizing any other DS3881s configured as lamp fre-
quency receivers. While DS3881 is sourcing lamp
frequency to other DS3881 ’s and spread-spectrum
modulation or frequency step features are enabled, the
LSYNC output is not affected by either EMI suppression
features. The DS3881 acts as a lamp frequency receiv-
er when the lamp clock is supplied externally. In this
case, a 40kHz to 100kHz clock must be supplied at the
LSYNC I/O. The external clock can originate from the
LSYNC I/O of a DS3881 configured as a lamp frequen-
cy source or from some other source.
Configuring Systems
with Multiple DS3881s
The source and receiver options for the lamp frequency
clock and DPWM signal allow multiple DS3881s to be
synchronized in systems requiring more than 1 lamp.
The lamp and dimming clocks can either be generated
on board the DS3881 using external resistors to set the
frequency, or they can be sourced by the host system
to synchronize the DS3881 to other system resources.
Figure 5 shows various multiple DS3881 configurations
that allow both lamp and/or DPWM synchronization for
all DS3881s in the system.
____________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS3881ER | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Single-Channel Automotive CCFL Controller |
| DS3881ET | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Single-Channel Automotive CCFL Controller |
| DS3882 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Dual-Channel Automotive CCFL Controller |
| DS3882_10 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Dual-Channel Automotive CCFL Controller |
| DS3882E | 制造商:Maxim Integrated Products 功能描述:CAR DUAL CCFL CONTROL TSSOP - 28 - Rail/Tube |
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