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參數(shù)資料
| 型號： | MAX1739-MAX1839 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Wide Brightness Range CCFL Backlight Controllers |
| 中文描述： | 寬范圍亮度CCFL背光控制器 |
| 文件頁數(shù)： | 10/26頁 |
| 文件大小： | 444K |
| 代理商： | MAX1739-MAX1839 |
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M
Wide Brightness Range
CCFL Backlight Controllers
10
______________________________________________________________________________________
Detailed Description
The MAX1739/MAX1839 regulate the brightness of a
CCFL in three ways:
1) Linearly controlling the lamp current.
2) Digitally pulse-width modulating (or chopping) the
lamp current (DPWM).
3) Using both methods simultaneously for widest dim-
ming range.
DPWM is implemented by pulse-width modulating the
lamp current at a rate faster than the human eye can
detect. Figure 1 shows the current and voltage wave-
forms for the three operating modes with the brightness
control set to 50% of full scale.
The MAX1739/MAX1839 include a 5.3V linear regulator
to power most of the internal circuitry, drivers for the
buck and Royer switches, and the synchronizable
DPWM oscillator. The MAX1739/MAX1839 are very flex-
ible and include a variety of operating modes, an ana-
log interface, an SMBus interface (MAX1739 only), a
shutdown mode, lamp-out detection, and buck-switch
short detection.
Figure 1. Brightness Control Methods
V
MINDAC
= 0
V
CTL
= V
CRF
/2
or BRIGHT[4:0] = 10,000
(DAC SET TO MIDSCALE)
EFFECTIVE BRIGHTNESS IS:
50% IN CONTINUOUS AND DPWM CONTROL
25% IN COMBINED CONTROL
V
CTAP
V
CSAV
CURRENT + DPWM CONTROL
CONTINUOUS CURRENT CONTROL
DPWM CONTROL
V
CTAP
TRANSFORMER
VOLTAGE
V
CSAV
LAMP CURRENT
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1739EEP | Wide Brightness Range CCFL Backlight Controllers |
| MAX1839 | Wide Brightness Range CCFL Backlight Controllers |
| MAX1839EEP | Wide Brightness Range CCFL Backlight Controllers |
| MAX1740 | Digital Signal Processors 144-LQFP |
| MAX1741 | SIM/Smart Card Level Translators in レMAX |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX173BCNG | 制造商:Maxim Integrated Products 功能描述: |
| MAX173C/D | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC CMOS 5us 10-Bit Complete ADC with Voltage Reference RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX173CNG | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Integrated Circuits (ICs) RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX173CNG+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10-Bit 200ksps 5.25V- Precision ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX173CWG | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Integrated Circuits (ICs) RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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