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PDF MAX7533 Data sheet ( Hoja de datos )
| Número de pieza | MAX7533 | |
| Descripción | CCFL Backlight and LCD Contrast Controllers | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-0197; Rev 1; 1/95
CCFL Backlight and
LCD Contrast Controllers
_______________General Description
The MAX753/MAX754 drive cold-cathode fluorescent
lamps (CCFLs) and provide the LCD backplane bias
(contrast) power for color or monochrome LCD panels.
These ICs are designed specifically for backlit note -
book-computer applications.
Both the backplane bias and the CCFL supply can be
shut down independently. When both sections are shut
down, supply current drops to 25µA. The LCD contrast
and CCFL brightness can be adjusted by clocking sep-
arate digital inputs or using external potentiometers.
LCD contrast and backlight brightness settings are pre-
served in their respective counters while in shutdown.
On power-up, the LCD contrast counter and CCFL
brightness counter are set to one-half scale.
The ICs are powered from a regulated 5V supply. The
magnetics are connected directly to the battery, for
maximum power efficiency.
The CCFL driver uses a Royer-type resonant architec-
ture. It can provide from 100mW to 6W of power to one
or two tubes. The MAX753 provides a negative LCD
bias voltage; the MAX754 provides a positive LCD bias
voltage.
________________________Applications
Notebook Computers
Palmtop Computers
Pen-Based Data Systems
Personal Digital Assistants
Portable Data-Collection Terminals
____________________________Features
o Drives Backplane and Backlight
o 4V to 30V Battery Voltage Range
o Low 500µA Supply Current
o Digital or Potentiometer Control of CCFL
Brightness and LCD Bias Voltage
o Negative LCD Contrast (MAX753)
o Positive LCD Contrast (MAX754)
o Independent Shutdown of Backlight and
Backplane Sections
o 25µA Shutdown Supply Current
______________Ordering Information
PART
TEMP. RANGE
MAX753CPE
0°C to +70°C
MAX753CSE
0°C to +70°C
MAX753C/D
0°C to +70°C
MAX753EPE
-40°C to +85°C
MAX753ESE
-40°C to +85°C
MAX754CPE
0°C to +70°C
MAX754CSE
0°C to +70°C
MAX754C/D
0°C to +70°C
MAX754EPE
-40°C to +85°C
MAX754ESE
-40°C to +85°C
* Contact factory for dice specifications.
PIN-PACKAGE
16 Plastic DIP
16 Narrow SO
Dice*
16 Plastic DIP
16 Narrow SO
16 Plastic DIP
16 Narrow SO
Dice*
16 Plastic DIP
16 Narrow SO
__________________Pin Configuration
TOP VIEW
VDD 1
LADJ 2
LON 3
CON 4
CADJ 5
GND 6
REF 7
CFB 8
MAX753
MAX754
16 LFB
15 BATT
14 LX
13 LDRV
12 PGND
11 CDRV
10 CS
9 CC
DIP/SO
Block Diagram located at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
Call toll free 1-800-998-8800 for free samples or literature.
http://www.Datasheet4U.com/
1 page  
CCFL Backlight and
LCD Contrast Controllers
10 CS
1 VDD
15
BATT
+5V, ±5%
UNREGULATED INPUT VOLTAGE
1, 15, 16 V+
2 SHDN
C1
MAX754CSE
D1A D1B
4
CON
5
CADJ
3
LON
2
LADJ
R16
+5V CMOS
LOGIC
CONTROL
SIGNALS
3 REF
C2 C3
10, 11
GND
MAX758ACWE
R17
D5
D2A D2B
7 SS
8 CC
12, 13, 14
LX
R2
R1
11 CDRV
Q2
Q1
L1
POSITIVE
CONTRAST
L2 VOLTAGE
7
REF
C4
8 CFB
14
LX
13
LDRV
12
PGND
16
LFB
6
GND
9
CC
D3
Q3
R3
R4
D4
81
R5
5 3,4
T1
2
R6
C6
D6A D6B
C9
C8 Q4
R10
Q5
2
61
C10
D7B
D7A
C7 R7
C5 R18 R8
Figure 1. CCFL and Positive LCD Power Supply
_______________________________________________________________________________________ 5
http://www.Datasheet4U.com/
5 Page 
CCFL Backlight and
LCD Contrast Controllers
Table 3. Spreadsheet Design Equations
PARAMETER
CCFL Specifications
Strike Voltage (VS)
SYMBOL
VS,RMS
Discharging Tube Current (IL)
ILAMP,RMS
Discharging Tube Voltage (VL)
VLAMP,RMS
LCD Contrast Voltage Specifications
Bias Voltage
VLCD
Output Current
ILCD
Royer Specifications
T1 Turns Ratio (Sec/Pri)
n
T1 Resonating Inductance
LMAG
C9 Value
CRES
C10 Value
CBAL
Royer Frequency
w
MAX754 Specifications
Reference Voltage
VREF
Second Volts Constant
sV
CCFL Circuit Calculations
R8 Current-Sensing Resistor
R8
Secondary Voltage Phase vs. Tube
Voltage
phi
T1 Center-Tap Peak Voltage
Secondary Limit Voltage
T1 Center-Tap Limit Peak Voltage
R5/R6
LCD Circuit Calculations
VIN(min) Full-Load Switching Period
VTAP,PK
VLIM
ROTP,RATIO
TFL
L2 Inductance
L2
L2 Peak Currrent
R4/R3
RLCD,RATIO
Application Circuit Operating Range
Input Voltage
VIN
MIN
1100
= 0.28 *
ILAMP,RMS(max)
TYP
435
MAX
1500
0.005
= VLCD(max) / 2
0.0245
0.000008
171
0.000045
2.2E-07
1.5E-11
= SQRT [1 / (LMAG * CRES)]
1.25
32.6
2.4E-05
= PI() * VREF * SQRT(2) /
(2 * ILAMP,RMS(max))
= ATAN (-ILAMP,RMS(max) /
(CBAL * w * + VLAMP,RMS)
= -SQRT(2) * ILAMP,RMS(max) /
(CBAL * w * SIN(phi)) / n
= VS,RMS(max) * 0.9
= SQRT(2) * VLIM / n
= VREF / (D25 - 0.6 - VREF)
= L2(max) * 0.8
= sV(min) / VIN(min) + sV(min) /
(VLCD(max) - VIN(min))
= sV(min) ^ 2 / (2 * TFL *
VLCD(max) * ILCD(min))
= VREF / (VLCD(max) - VREF)
= sV(max) / L2(min)
= (2 / PI()) * VTAP,PK
18
______________________________________________________________________________________ 11
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| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MAX7533.PDF ] | |
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