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PDF ( 数据手册 , 数据表 ) LX1689IPW

零件编号 LX1689IPW
描述 Third Generation CCFL Controller
制造商 Microsemi Corporation
LOGO Microsemi Corporation LOGO 


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LX1689IPW 数据手册, 描述, 功能
INTEGRATED PRODUCTS
LX1689
Third Generation CCFL Controller
PRODUCTION DATA SHEET
DESCRIPTION
The LX1689 is the latest generation
The brightness control input allows the
Direct Drive CCFL (Cold Cathode use of either a DC voltage or a PWM
Fluorescent Lamp) Controller. It uses input to simplify design. Programmable
new circuit design techniques (patents polarity brightness control is retained,
pending) and combines digital and linear except in the case of externally clocked
circuits with an advanced BiCMOS digital dimming. Two onboard LDO
process to create a more complete regulators extend the input voltage range
controller in a small package.
of the IC up to 28 Volts without using
When compared to the original external circuitry as was required with our
LX1686 design, identical module previous controllers. The LX1689
applications use from 12 to 30 less includes a new lamp strike detection
components. New functions and scheme that saves a package pin and three
enhancements have been added to make external components. Internal circuits
the LX1689 even easier to use.
monitor lamp current pulses at the I_SNS
The on-chip PLL circuit used to input to determine if the lamp strikes and
synchronize the digital dimming burst if it stays ignited once operational.
frequency to the video frame rate, as
Integrating full wave rectifiers for
used in the LX1686, is replaced with a each of three lamp inputs has significantly
programmable counter. This counter can reduced the lamp feedback component
divide the video controller horizontal count. In addition the controller features
sync pulse, other external clock source include auto shutdown for open or broken
or the internal chip clock source to lamps, and a lamp fault detection with a
generate the burst frequency.
status reporting output.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
KEY FEATURES
ƒ 3 to 28 Volt Single Fixed (±20%)
Supply Operating Range
ƒ Selectable Analog/Digital
Dimming Modes
ƒ Digital Dimming Can Synch to
External Or Internal Clocks
ƒ User Programmable Digital
Dimming Burst Frequency
ƒ 252 mS Power On Delay
ƒ Flexible Lamp Current
Compensation Input
ƒ Open Lamp Shutdown and Fault
Output Indicator
ƒ “On Chip” Full Wave Lamp
Current & Voltage Rectifiers
ƒ 20 Pin TSSOP Package
BENEFITS
ƒ Low Component Count /
Module Cost / Size
ƒ High “Nits/Watt” Efficiency
ƒ Operates Directly From 1 to 6
Li_Ion Cells
ƒ Lamp Current Compensation
Input Makes Indoor/Outdoor
And Wide Temperature Range
Applications Easy to Design
PRODUCT HIGHLIGHT
LX1689 CCFL Inverter Layouts Examples*
2.64in. (67mm)
Actual Inverter Size
OR
1.38in. (35mm)
.397 in.
(10mm)
.870 in.
(22mm)
Actual Inverter Size
*As Shown in Figure 1 (Typical Application)
Bill of Materials
1 LX1689CPW
1 Transformer
1 Dual FET
2 Connectors
7 Resistors
9 Capacitors
21 Total Count
Copyright 2000
Rev. 1.0b, 2003-03-31
TJ (°C)
0 to 70
-40 to 85
PACKAGE ORDER INFO
MIN VDD
3V
3V
MAX VDD
28V
28V
Plastic TSSOP
PW 20-PIN
LX1689CPW
LX1689IPW
Note: Available in Tape & Reel.
Append the letter “T” to the part number. (i.e. LX1689CPWT)
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1







LX1689IPW pdf, 数据表
INTEGRATED PRODUCTS
LX1689
Third Generation CCFL Controller
PRODUCTION DATA SHEET
V_BATT
BLOCK DIAGRAM
ENABLE
ENABLE & BIAS
GENERATOR
BLOCK
SLEEP
SHUTDOW N
RAMP_D
FAULT
PWM CONTROL
BLOCK
OUTPUT
STEERING
LOGIC
OUTPUT DRIVERS BLOCK
AOUT
VDD_A
DUAL LDO
5.3V
2.95V
VDD_P
UVLO BIAS
2.0V
REF
PW R_GD
I_R
BRITE_IN
BRITE_C
2.0V
+
-
0.5V
VDD_A
FAULT
0.5V
50K
+
-
75K 50K
-
0.5V +
DIM CLOCK
IGNITE
DIGITAL DIM
DDIM
F EXT
ANADIM
B R IT E _O U T
200K
BRITE_R I1
I1
D IM _C LK
DIM_ MODE
DIV_248
VDD_A
-
+
3 STATE
DECODER
3 STATE
DECODER
1V
EXT
ANLG
INT
-
+
6BIT
VDAC
MUX
&
DIV
6 BIT
COUNTER
N
R
QD
Q
RESET
QS
RS R
DIGITAL DIM
ANALOG DIM
DIMMING
CONTROL
BLOCK
BOUT
+ RAMP_C
-
BRITE_OUT +
-
ERROR
AMP
EA_OUT
EA_IN
-
+
2.0V
-
+
-
+
LAMP FEEDBACK
CONDITIONING BLOCK
LSNS
RECTIFIER
OC_SNS
RECTIFIER
OV_SNS
RECTIFIER
I_SNS
OC_SNS
OV_SNS
+
-
300mV
RUN MODE
FAULT DET
STRIKE MODE
FAULT DET
200K
GND
STRIKE
DETECTION
BLOCK
FAULT
IGNITE
20 BIT
COUNTER &
POW ER ON
RESET LOGIC
10 BIT
REGISTER
10 BIT
IDAC
RAMP
GENERATOR
RAMP_C
TIMMING
GENERATOR
BLOCK
FIGURE 1 – Simplified Block Diagram
Copyright 2000
Rev. 1.0b, 2003-03-31
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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