MAX753/MAX754
CCFL Backlight and
LCD Contrast Controllers
10 ______________________________________________________________________________________
PARAMETER SYMBOL MIN TYP MAX UNITS
Strike Voltage (V
S
) V
S,RMS
1100 1500 V
RMS
Discharging Tube Current (I
L
) I
LAMP,RMS
0.001376 0.005 A
RMS
Discharging Tube Voltage (V
L
) V
LAMP,RMS
435 V
RMS
Bias Voltage V
LCD
16.3 32.6 V
Output Current I
LCD
0.0245 A
T1 Turns Ratio (Sec/Pri) (Note 2) n 171
T1 Resonating Inductance (Note 2) L
MAG
0.000045 H
C9 Value (Note 3) C
RES
2.2E-07 F
C10 Value C
BAL
1.5E-11 F
Royer Frequency w 317820.86 rad/s
Reference Voltage V
REF
1.25 V
Second Volts Constant sV 0.000008 2.4E-05 sV
R8 Current-Sensing Resistor R8 555.36037 Ω
Secondary Voltage Phase vs. Tube Voltage phi -1.1776341 Radian
Secondary Limit Voltage V
LIM
1350 V
RMS
T1 Center-Tap Limit Peak Voltage 11.164844 V
PEAK
R5/R6 R
OTP,RATIO
0.1341944 Ω/Ω
V
IN(min)
Full-Load Switching Period T
FL
1.639E-06 s
L2 Inductance L2 1.96E-05 2.4E-05 H
L2 Peak Currrent 1.22704 A
R4/R3 R
LCD,RATIO
0.0398724 Ω/Ω
Input Voltage V
IN
5.978103 18 V
Table 2. CCFL Circuit Design Example (Note 1)
T1 Center-Tap Peak Voltage V
TAP,PK
9.3903817 V
PEAK
Note 1: To perform your own calculations for the parameters given in Table 2 (Design Example), use the equations given in Table
3 (Design Equations).
Note 2: T1 = Sumida’s EPS207
Note 3: C9 = Wima’s SMD 7.3 __/63
CCFL Specifications
LCD Contrast Voltage Specifications
Royer Specifications
MAX754 Specifications
CCFL Circuit Calculations
LCD Circuit Calculations
Application Circuit Operating Range
