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參數(shù)資料
| 型號： | MAX754EPE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Dual 2-Line To 4-Line Decoders/Demultiplexers 20-LCCC -55 to 125 |
| 中文描述： | FLUORESCENT LIGHT CONTROLLER, 80 kHz SWITCHING FREQ-MAX, PDIP16 |
| 封裝： | PLASTIC, DIP-16 |
| 文件頁數(shù)： | 6/16頁 |
| 文件大小： | 103K |
| 代理商： | MAX754EPE |
M
CCFL Bac klight and
LCD Contrast Controllers
6
_______________________________________________________________________________________
In Figure 1, the MAX758A, L1, and D5 form a voltage-
controlled switch-mode current source. The current out
of L1 is proportional to the voltage applied to the SS
pin. The MAX758A contains a current-mode pulse-
width-modulating buck regulator that switches at
170kHz. The voltage on the SS pin sets the switch cur-
rent limit and thus sets the current out of L1.
CCFL Current-Regulation Loop
Figure 3 shows a block diagram of the regulation loop,
which maintains a fixed CCFL average lamp current
despite changes in input voltage and lamp impedance.
This loop regulates the average value of the half-wave
rectified lamp current. The root mean square lamp cur-
rent is related to, but not equal to, the average lamp
current. Assuming a sinusoidal lamp current, select R8
as follows:
R
I
LAMP RMS
2
,
where V
REF
= 1.25V and I
LAMP,RMS
is the desired full-
scale root mean square lamp current.
V
REF
8
=
π
0 1
343
372
402
2
DAC CODE
ZEROSCALE
D
MID SCALE
FULL SCALE
3
14 15 16
29 30 31
753
782
811
1191
1221
1250
Figure 2. CCFT DAC Transfer Function
MAX754
MAX758A
CC
LOGIC AND
5-BIT COUNTER
5-BIT VOLTAGE
OUTPUT DAC
SWITCH-MODE
VOLTAGE CONTROLLED
CURRENT SOURCE
FULL-SCALE = 1.250V
HALF-SCALE = 0.782V
ZERO-SCALE = 0.343V
CFB
ERROR
AMPLIFIER
CON
CADJ
SS
C10
C5
R8
R18
I
BUCK
CENTER-TAP
TRANSISTOR
EMITTERS
ROYER
OSCILLATOR
C
Figure 3. CCFL Tube Current-Regulation Loop
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX754ESE | Dual 2-Line To 4-Line Decoders/Demultiplexers 16-CDIP -55 to 125 |
| MAX757CPA | 10-Line To 4-Line And 8-Line To 3-Line Priority Encoders 16-CDIP -55 to 125 |
| MAX756-MAX757 | 3.3V/5V/Adjustable-Output, Step-Up DC-DC Converters |
| MAX756EPA | 3.3V/5V/Adjustable-Output, Step-Up DC-DC Converters |
| MAX757CSA | 10-Line To 4-Line And 8-Line To 3-Line Priority Encoders 16-CFP -55 to 125 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX754EPE+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX754ESE | 功能描述:顯示驅(qū)動器和控制器 RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| MAX754ESE+ | 功能描述:顯示驅(qū)動器和控制器 CCFL Backlight & LCD Neg Contrast Ctlr RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| MAX754ESE+T | 功能描述:顯示驅(qū)動器和控制器 CCFL Backlight & LCD Neg Contrast Ctlr RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| MAX754ESE-T | 功能描述:顯示驅(qū)動器和控制器 RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
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