MAX753 Maxim, MAX753 Datasheet - Page 10

• Manufacturer Part Number: MAX753
• Description: CCFL Backlight and LCD Contrast Controllers
• Manufacturer: Maxim

CCFL Backlight and
LCD Contrast Controllers
Table 2. CCFL Circuit Design Example (Note 1)
Note 1:
Note 2:
Note 3:
10
CCFL Specifications
Strike Voltage (V
Discharging Tube Current (I
Discharging Tube Voltage (V
LCD Contrast Voltage Specifications
Bias Voltage
Output Current
Royer Specifications
T1 Turns Ratio (Sec/Pri) (Note 2)
T1 Resonating Inductance (Note 2)
C9 Value (Note 3)
C10 Value
Royer Frequency
MAX754 Specifications
Reference Voltage
Second Volts Constant
CCFL Circuit Calculations
R8 Current-Sensing Resistor
Secondary Voltage Phase vs. Tube Voltage
T1 Center-Tap Peak Voltage
Secondary Limit Voltage
T1 Center-Tap Limit Peak Voltage
R5/R6
LCD Circuit Calculations
V
L2 Inductance
L2 Peak Currrent
R4/R3
Application Circuit Operating Range
Input Voltage
IN(min)
______________________________________________________________________________________
Full-Load Switching Period
To perform your own calculations for the parameters given in Table 2 (Design Example), use the equations given in Table
3 (Design Equations).
T1 = Sumida’s EPS207
C9 = Wima’s SMD 7.3 __/63
PARAMETER
S
)
L
L
)
)
R
R
V
I
SYMBOL
LAMP,RMS
LCD,RATIO
LAMP,RMS
OTP,RATIO
V
V
L
V
C
C
TAP,PK
V
S,RMS
I
V
T
V
LCD
MAG
phi
R8
LCD
sV
L2
RES
BAL
REF
w
LIM
n
FL
IN
0.001376
0.000008
5.978103
1.96E-05
0.0245
1100
MIN
16.3
-1.1776341
317820.86
555.36037
9.3903817
11.164844
0.1341944
0.0398724
1.639E-06
0.000045
2.2E-07
1.5E-11
1350
TYP
1.25
435
171
1.22704
2.4E-05
2.4E-05
0.005
MAX
1500
32.6
18
Radian
UNITS
V
V
A
V
V
rad/s
V
Ω/Ω
Ω/Ω
PEAK
PEAK
RMS
RMS
RMS
RMS
sV
Ω
V
A
H
V
H
A
V
F
F
s