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參數資料
| 型號： | MAX1895EGI |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | High-Efficiency, Wide Brightness Range, CCFL Backlight Controllers |
| 中文描述： | 1 A FLUORESCENT LIGHT CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PQCC28 |
| 封裝： | 5 X 5 MM, 0.90 MM HEIGHT, QFN-28 |
| 文件頁數： | 1/31頁 |
| 文件大小： | 1150K |
| 代理商： | MAX1895EGI |
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General Description
The MAX1895/MAX1995 integrated controllers are opti-
mized to drive cold-cathode fluorescent lamps (CCFL)
using a synchronized full-bridge inverter architecture.
Synchronized drive provides near sinusoidal wave-
forms over the entire input range to maximize the life of
CCFLs. The controllers also operate over a wide input
voltage range with high efficiency and broad dimming
range.
The MAX1895/MAX1995 include safety features that
limit the transformer secondary voltage and protect
against single-point fault conditions including lamp-out
and short-circuit faults.
The MAX1895/MAX1995 regulate the CCFL brightness
in three ways: linearly controlling the lamp current, digi-
tal pulse-width modulating (DPWM) the lamp current, or
using both methods simultaneously to achieve the
widest dimming range (>30:1). CCFL brightness can
be controlled with either an analog voltage (both
MAX1895 and MAX1995) or a two-wire SMBus com-
patible interface (MAX1895 only).
The MAX1895/MAX1995 directly drive the four external
N-channel power MOSFETs of the full-bridge inverter.
An internal 5.3V linear regulator powers the MOSFET
drivers, the synchronizable DPWM oscillator, and most
of the internal circuitry. The MAX1895/MAX1995 are
available in the space-saving 28-pin thin QFN package
and operate over the -40°C to +85°C temperature
range.
Applications
Notebook Computers
Car Navigation Displays
LCD Monitors
Point-of-Sale Terminals
Portable Display Electronics
Features
o
Synchronized-to-Resonant Frequency
Good Crest Factor for Longer Lamp Life
Ensures Maximum Strike Capability
o
High Power to Light Efficiency
o
Wide Dimming Range (3 Methods)
Lamp Current Adjust: >3 to 1
Digital PWM (DPWM): >10 to 1
Combined: >30 to 1
o
Feed-Forward for Fast Response to Step Change
of Input Voltage
o
Wide Input Voltage Range (4.6V to 28V)
o
Transformer Secondary Voltage Limiting to
Reduce Transformer Stress
o
Lamp-Out Protection with 2s Timeout
o
Short-Circuit and Other Single-Point Fault
Protections
o
Synchronizable DPWM Frequency
o
Dual-Mode Brightness Control Interface
SMBus Serial Interface (MAX1895 Only)
Analog Interface (Both Devices)
o
High-Accuracy Analog Interface
Separate 100% Brightness Voltage Reference
Pin (CRFSDA)
Separate Minimum Lamp-Current Set-Point Pin
(MINDAC)
o
Small Footprint 28-Pin Thin QFN (5mm x 5mm)
Package
Pin Configurations
M
High-Efficiency, Wide Brightness
Range, CCFL Backlight Controllers
________________________________________________________________
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
2
2
2
2
2
2
2
8
9
1
1
1
1
1
15
16
17
18
19
20
21
7
6
5
4
3
2
1
MAX1895
THIN QFN
TOP VIEW
REF
ILIM
MINDAC
GND
MODE
CRF/SDA
CTL/SCL
V
C
B
C
C
I
N
V
F
GH2
LX2
BST2
BST1
LX1
GH1
GL1
G
P
V
D
N
N
N
S
19-2157; Rev 1; 10/02
Ordering Information
PART
TEMP RANGE
-40
°
C to +85
°
C
-40
°
C to +85
°
C
-40
°
C to +85
°
C
-40
°
C to +85
°
C
PIN-PACKAGE
28 Thin QFN 5
5
28 QFN 5
5
28 Thin QFN 5
5
28 QFN 5
5
MAX1895
ETI
MAX1895EGI*
MAX1995
ETI
MAX1995EGI*
SMBus is a trademark of Intel Corp.
Pin Configurations continued at end of data sheet.
*
Contact factory for availability.
相關PDF資料 |
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|---|---|
| MAX1895 | Fixed-Point Digital Signal Processor 288-FCBGA |
| MAX1895ETI | Fixed-Point Digital Signal Processor 288-FCBGA |
| MAX1995EGI | High-Efficiency, Wide Brightness Range, CCFL Backlight Controllers |
| MAX1995ETI | High-Efficiency, Wide Brightness Range, CCFL Backlight Controllers |
| MAX2027 | IF Digitally Controlled Variable-Gain Amplifier |
相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX1895EGI-T | 功能描述:顯示驅動器和控制器 RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| MAX1895EVKIT-D | 制造商:Maxim Integrated Products 功能描述:SMBUS INTERFACE BACKLIGHT - Rail/Tube |
| MAX1895EVKIT-S | 制造商:Maxim Integrated Products 功能描述:SMBUS INTERFACE BACKLIGHT - Rail/Tube |
| MAX1896EUT | 制造商:Maxim Integrated Products 功能描述:1.4MHZ SOT23 CURRENT-MODE STEP-UP D - Cut Tape Product |
| MAX1896EUT#G16 | 制造商:Maxim Integrated Products 功能描述:1.4MHZ SOT23 CURRENT-MODE STEP-UP DC-DC CONVERTER - Rail/Tube |
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