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PDF MAX1611CSE Data sheet ( Hoja de datos )
| Número de pieza | MAX1611CSE | |
| Descripción | Digitally Controlled CCFL Backlight Power Supplies | |
| Fabricantes | Maxim Integrated | |
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19-1128; Rev 0; 9/96
EVAALVUAAILTAIOBNLEKIT
Digitally Controlled CCFL Backlight
Power Supplies
_______________General Description
The MAX1610/MAX1611 are fully integrated, high-
efficiency drivers for cold-cathode fluorescent lamps
(CCFLs). They operate from a 4.5V to 26V power
source. An on-board, high-switching-frequency power
MOSFET reduces external component count and mag-
netics size. The MAX1610/MAX1611 protect against
open or shorted lamps. The CCFL can be driven from
an isolated transformer secondary winding to improve
efficiency and avoid flicker at dim tube settings.
Brightness is adjusted by scaling the lamp current, or
by operating with a fixed lamp current and chopping
the CCFL on and off at a rate faster than the eye can
detect.
The MAX1610’s digital inputs increment, decrement, or
clear an internal, 5-bit up/down counter, which sets
CCFL brightness. The MAX1611 uses a System
Management Bus (SMBus) 2-wire serial interface to
directly set CCFL brightness. Both devices include
micropower shutdown and a linear regulator that elimi-
nates the need for a separate logic supply. The digital
interface remains active in shutdown, preserving the
brightness setting.
____________________________Features
® Direct Digital Control of CCFL Brightness
® Low Supply Current: 3mA Max Operating
20µA Max Shutdown
® Low-Voltage Operation, Down to 4.5V
® WInternal 26V, 0.7 Power Switch
® Protection Against Open or Shorted Lamps
® Supports Isolated Transformer Secondary
Winding
® SMBus Serial Interface (MAX1611)
® No Flicker at Low Brightness (internal 280Hz
current chopping)
® High Power-to-Light Efficiency
® Selectable 290kHz/145kHz Switching Frequency
® Oscillator SYNC Input
® 16-Pin Narrow SO Package
________________________Applications
Notebook/Laptop Computers
Point-of-Sale Terminals
Portable Medical Equipment
Instrument Displays
______________Ordering Information
PART
MAX1610CSE
MAX1611CSE
TEMP. RANGE
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
16 Narrow SO
16 Narrow SO
__________________________________________________________Pin Configurations
TOP VIEW
UP 1
DN 2
SHDN 3
SYNC 4
SS 5
CC 6
CSAV 7
MINDAC 8
MAX1610
SO
16 BATT
15 LX
14 BST
13 GND
12 VL
11 CS
10 OTP
9 REF
SDA 1
SCL 2
SMBSUS 3
SYNC 4
SS 5
CC 6
CSAV 7
MINDAC 8
MAX1611
SO
16 BATT
15 LX
14 BST
13 GND
12 VL
11 CS
10 OTP
9 REF
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
1 page  
Digitally Controlled CCFL Backlight
Power Supplies
__________________________________________Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
REF OUTPUT VOLTAGE
vs. REF OUTPUT CURRENT
2.2
SHDN = VL, BATT = 5V
2.1
2.0
1.9
1.8
1.7
1.6
BATT SUPPLY CURRENT
vs. BATT VOLTAGE (SHDN = VL)
2.0
SHDN = VL, OTP = 3V
1.8
1.6
1.4
1.2
VL OUTPUT VOLTAGE
vs. VL OUTPUT CURRENT
5.0
SHDN = VL, OTP = 3V
4.5
BATT = 5V
4.0
BATT = 12V
3.5
3.0
2.5
1.5
1
10 100 1000
REF OUTPUT CURRENT (µA)
10000
1.0
0 4 8 12 16 20 24 28
BATT (V)
2.0
0
10 20 30
VL OUTPUT CURRENT (mA)
40
VL OUTPUT VOLTAGE
vs. VL LOAD CURRENT
3.70
SHDN = GND
3.65
3.60
BATT = 12V
3.55
3.50
3.45
3.40
BATT = 5V
3.35
3.30
0
200 400 600 800 1000
VL LOAD CURRENT (µA)
BATT SUPPLY CURRENT
vs. BATT VOLTAGE (SHDN = OV)
10
SHDN = OV
8
6
4
2
0
0 4 8 12 16 20 24 28
BATT (V)
VL OUTPUT VOLTAGE
vs. BATT VOLTAGE (SHDN = VL)
5.0
4.5
4.0
3.5
VL OUTPUT VOLTAGE
vs. BATT VOLTAGE (SHDN = OV)
5.0
NO LOAD ON VL,
SHDN = OV
4.5
4.0
3.5
3.0
2.5
2.0
0 4 8 12 16 20 24 28
BATT (V)
3.0
2.5
NO LOAD ON VL,
2.0 SHDN = VL
0 4 8 12 16 20 24 28
BATT (V)
_______________________________________________________________________________________ 5
5 Page 
Digitally Controlled CCFL Backlight
Power Supplies
FIGURE 4 CIRCUIT, C2 = 15pF, IR1 = 462mA,
CCFL VL = 500VRMS
BATT = 10V, IBATT = 0.20A,
MINDAC = 0.5V, D/A VALUE = 11111
6V
T1
CENTER-TAP
VOLTAGE
0V
1A
C1
CURRENT
-1A
5µs/div
Figure 5. Royer Oscillator Typical Operating Waveforms for
Circuit of Figure 4
REF / 8 = 250mV
FULL-SCALE
3V
FIGURE 4 CIRCUIT, C2 = 15pF,
R1 = 545Ω,
CCFL VL = 500VRMS, BATT = 15V,
MINDAC = 0.5V, D/A VALUE = 10000
SS
VOLTAGE
0V
6V
T1
CENTER-TAP
VOLTAGE
0V
10ms/div
Figure 6. Start-Up Waveforms for Circuit of Figure 4
MID-SCALE
MIN-SCALE = MINDAC / 8
OmV
DAC CODE
NOTE: DAC CODE 00000 FORCES THE BATT-TO-LX SWITCH OFF REGARDLESS OF CSAV OR MINDAC VOLTAGE.
Figure 7. CSAV Regulation Voltage Range
______________________________________________________________________________________ 11
11 Page | ||
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| PDF Descargar | [ Datasheet MAX1611CSE.PDF ] | |
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