Transcript Monolithic Power Systems, Inc.

Cold Cathode Fluorescent Lamp (CCFL) Drivers
INVERTER FOR CCFL ELECTRICAL Requirements
ITEM
Symbol
Min.
TYP.
Max
UNIT
Remark
Input Voltage
INV_PWR
9
14.8
21
V DC
Input Current
I in
-
-
0.65
A
H.V(open)
Vs
1550
-
-
V rms
Lamp Voltage
VL
-
650
-
V rms
IL
6.2
6.5
6.8
mA
PWM=100%
IL
3.0
3.3
3.6
mA
PWM=30%
ON
2.8
3.3
3.6
V
Backlight on/off signal
OFF
0
0.5
0.8
V
Low level
INV_PWM
3.0
3.3
3.6
V
PWM signal
INV_PWM
30
-
100
%
PWM duty cycle
PWM Frequency
F
142
150
158
Hz
Lamp Frequency
F
45
55
65
KHz
Lamp Current
Dis off
PWM Signal
Design by Cary.Chen
Cold Cathode Fluorescent Lamp (CCFL) Drivers
CCFL Driver Product Selection Guide
Part
Number
灯
管
数
输
入
电
压
最
大
输
入
电
压
偏
置
供
电
电
压
参
考
电
压
静
态
静
止
电
流
uA
静
态
工
作
电
流
mA
评估板
封装
TSSOP20
TSSOP20F
#:Integrated Power Switches
#:Open Lamp Regulation
#:Current and Voltage Feedback
Control
#:Logic Level Burst Mode Control
#:Supports Open/Short Lamp
Protection
#:Soft Start
#:Output is Short Circuit Protected
#:Analog and Burst Mode Dimming
TSSOP20F
#:4.5V to 14V Power Input (VBatt))
#:Current Voltage Feedback Control
#:Analog and Burst Mode Dimming
SOIC28
TSSOP28
#:Fixed Operating Frequency
#:Input Voltage Range of 10V to 32V
#:Full-Wave Sense Amp
#:Integrated Burst Mode Oscillator
and Modulator
#:Soft-On and Soft-Off Burst
Envelope
6.0V
MP1010B
1
TO
25
V
NR*
16
V
4.5V
TO
5.5V
5
10
2.5
EV0037
1.8
EV1026EF00A
22V
MP1026
MP1038
1
UP
TO
8
4.5V
TO
14V
10V
TO
32V
35
V
NR*
N/A
6
500
10
3
EV1038DM
-03A
主要特性
Cold Cathode Fluorescent Lamp (CCFL) Drivers
CCFL Drivers Features and Benefits
Features
Benefits
Resonant Technology
This technology ensures the lamp will strike at any temperature and in any
environment. In addition no additional components are required for varying the
frequency of the lamp.
High Efficiency
The full bridge technology allows near perfect sine waves for optimum efficiency
which results in the maximum light output per watt. This also eliminates the need
for high voltage ballast capacitors.
Protection
All of our devices provide integrated short circuit and open and short lamp
protection.
Small Form Factor
All CCFL IC drivers integrate full bridge architecture using N-Channel MOSFETs,
which reduces total solution part count. In addition MPS’ patented circuit
architecture creates an efficient and low cost solution.
Brightness
Multiple Lamp
Capacity
Our Ics incorporate Analog and PWM dimming techniques, internal oscillators for
burst mode and integrated soft-on and soft-off capabilities.
MPS has a patented technique for matching lamp currents allowing 2% tolerances
Cold Cathode Fluorescent Lamp (CCFL) Drivers
CCFL Application Table
Application
Requirements
MPS Products
PDAs
Digital Cameras
Handheld Products
Video Cameras
GPS Systems
Copiers
High Efficiency
Small Form Factor
Low Profile Module
2.6 to 6 Volt Operation
Up to 2 Watts
MP1022A
MP1025
Notebooks
Web Pads / Tablets
Picture Frames
eBooks
Portable DVD Players
POS / ATM Terminals
High Efficiency
Small Form Factor
6 to 25 Volt Operation(MP1010B)
4.5 to 14V Volt Operation(MP1026)
Low Cost Solution
Up to 8 Watts
MP1010B
MP1026
Flat Panel LCD Monitors
Automotive Entertainment
High / Bright Displays (Daylight
Readable)
Lamp Matching
Multiple Lamp Capability
Thermal Management
Up to 150 Watts
MP1038
Cold Cathode Fluorescent Lamp (CCFL) Drivers
MP1010B
DESCRIPTION
FEATURES
The MP1010B is a power solution IC that offers
#:Integrated Power Switches
a true complete solution for driving a Cold
#:6.0V to 22V Variable Supply Voltage with
Cathode Fluorescent Lamps (CCFL). This
Regulated Lamp Current.
Power IC converts unregulated DC voltage to a
#:Rated 12W Power Output at 12V Input
nearly pure sine wave required to ignite and
#:Open Lamp Regulation
operate the CCFL. Based on proprietary power
#:Current and Voltage Feedback Control
topology and control techniques it greatly
#:Logic Level Burst Mode Control
increases the power conversion efficiency.
#:Supports Open/Short Lamp Protection
#:Soft-Start
APPLICATIONS
#:Short Circuit Protected Output
#:LCD Backlight Inverter for Notebook Computers
#:High Energy Start Pulse
#:Web Pads, GPS, Desktop Displays,
#:Analog and Burst Mode Dimming
Portable DVD, Car Video Display Systems
Cold Cathode Fluorescent Lamp (CCFL) Drivers
MP1026
DESCRIPTION
The MP1026 is a Power IC that offers a
complete solution for driving a Cold Cathode
FEATURES
#:4.5V to 14V Power Input (VBatt)
Fluorescent Lamp (CCFL). This Power IC
#:Increase Transformer Reliability
converts unregulated DC voltage to a nearly
#:Open Lamp Timer and Regulation
pure sine wave required to ignite and operate
#:Current and Voltage Feedback Control
the CCFL.
#:Logic Level Burst Mode Control
The MP1026 greatly increases power
#:Supports Open/Short Lamp Protection
conversion efficiency and supports both analog
and burst mode dimming, simplifying the module
#:Soft-Start
implementation. The MP1026 offers the
#:Outputs are Short Circuit Protected
following distinct performance advantages:
#:Allows Burst-Mode Operation
#:More light for less power
#:Improved Line Transient Response
#:Small board implementation
#:Tightened Lamp Current Accuracy
#:Low RF emission
#:Low external components cost
The MP1026 is suitable for 2-Cell Li-Ion battery
applications using 5V, 9V, or 12V adapters as
the power source.
Cold Cathode Fluorescent Lamp (CCFL) Drivers
DESCRIPTION
The MP1038 is a fixed operating frequency inverter
MP1038
FEATURES
controller that controls four external N-Channel
power MOSFETs in a full-bridge configuration. The
#:Controls Four External, Low Cost, N-Channel
inverter is designed to power one or more cold
MOSFETs
cathode fluorescent lamps (CCFL) to backlight
liquid crystal displays. Its full-bridge architecture
#:Fixed Operating Frequency
converts unregulated DC input voltages to the
#:Input Voltage Range of 10V to 32V
nearly pure sine waves required to ignite and
#:Lamp Current and Voltage Regulation
operate CCFL.
For reliable lamp ignition, the operating frequency is
#:Full-Wave Sense AmpE
set by an external resistor and during startup, is
#:Analog and Burst Mode Dimming Control
temporarily swept toward the unloaded resonant
frequency of the tank. The built-in burst oscillator
#:Integrated Burst Mode Oscillator and Modulator
can be synchronized with an external clock to
#:Soft-On and Soft-Off Burst Envelope
minimize display scan interference. Burst mode or
#:Open Lamp Protection
analog mode dimming is controlled with an external
analog signal. Built-in fault management features
#:Secondary Over-Current Protection
include an open lamp regulator, a transformer
#:Dual-mode, Fault Timer
secondary peak current regulator, and a dual-mode
fault timer. The secondary over-current timeout can
be shortened with external components. Built-in
current limits for the external switches protect
against inadvertent shorts. The MP1038 is available
in TSSOP28 and SOIC28 packages.
#:Available in TSSOP28 and SOIC28 Packages