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參數(shù)資料
| 型號： | MAX754 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | CCFL Backlight and LCD Contrast Controllers(CCFT背光和液晶顯示器對比度控制器（電源）) |
| 中文描述： | CCFL背光燈及LCD對比度控制負(fù)壓控制器 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 137K |
| 代理商： | MAX754 |
M
CCFL Bac klight and
LCD Contrast Controllers
______________________________________________________________________________________
11
Table 3. Spreadsheet Design Equations
T1 Center-Tap Peak Voltage
PARAMETER
SYMBOL
MIN
TYP
MAX
V
TAP,PK
Strike Voltage (V
S
)
V
S,RMS
1100
1500
= -SQRT(2) * I
LAMP,RMS(max)
/
(C
BAL
* w * SIN(phi)) / n
Discharging Tube Voltage (V
L
)
LCD Contrast Voltage Specifications
V
LAMP,RMS
435
Bias Voltage
Output Current
Royer Specifications
V
LCD
I
LCD
= V
LCD(max)
/ 2
0.0245
32.6
T1 Turns Ratio (Sec/Pri)
T1 Resonating Inductance
C9 Value
C10 Value
Royer Frequency
MAX754 Specifications
n
171
L
MAG
C
RES
C
BAL
w
0.000045
2.2E-07
1.5E-11
= SQRT [1 / (L
MAG
*C
RES
)]
Reference Voltage
Second Volts Constant
CCFL Circuit Calculations
V
REF
sV
1.25
0.000008
2.4E-05
R8 Current-Sensing Resistor
R8
= PI() * V
REF
* SQRT(2) /
(2 * I
LAMP,RMS(max)
)
Secondary Voltage Phase vs. Tube
Voltage
phi
= ATAN (-I
LAMP,RMS(max)
/
(C
BAL
* w * + V
LAMP,RMS
)
Secondary Limit Voltage
T1 Center-Tap Limit Peak Voltage
R5/R6
LCD Circuit Calculations
V
LIM
= V
S,RMS(max)
* 0.9
= SQRT(2) * V
LIM
/ n
= V
REF
/ (D25 - 0.6 - V
REF
)
R
OTP,RATIO
V
IN(min)
Full-Load Switching Period
T
FL
= sV(min) / V
IN(min)
+ sV(min) /
(V
LCD(max)
- V
IN(min)
)
L2 Inductance
L2
= L2(max) *0.8
= sV(min) ^ 2 / (2 * T
FL
*
V
LCD(max)
* I
LCD(min)
)
L2 Peak Currrent
R4/R3
Application Circuit Operating Range
= sV(max) / L2(min)
R
LCD,RATIO
= V
REF
/ (V
LCD(max)
- V
REF
)
Input Voltage
V
IN
= (2 / PI()) * V
TAP,PK
18
Discharging Tube Current (I
L
)
I
LAMP,RMS
= 0.28 *
I
LAMP,RMS(max)
0.005
CCFL Specifications
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