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Microsemi Corporation - Third Generation CCFL Controller

Numéro de référence LX1689
Description Third Generation CCFL Controller
Fabricant Microsemi Corporation 
Logo Microsemi Corporation 





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LX1689 fiche technique
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
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