lx1689 Microsemi Corporation, lx1689 Datasheet

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lx1689

Manufacturer Part Number
lx1689
Description
Third Generation Ccfl Controller
Manufacturer
Microsemi Corporation
Datasheet

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Copyright © 2000
Rev. 1.1, 2006-02-27
Direct Drive CCFL (Cold Cathode
Fluorescent Lamp) Controller. It uses
new circuit design techniques (patents
pending) and combines digital and linear
circuits with an advanced BiCMOS
process to create a more complete
controller in a small package.
LX1686
applications use from 12 to 30 less
components.
enhancements have been added to make
the LX1689 even easier to use.
synchronize the digital dimming burst
frequency to the video frame rate, as
used in the LX1686, is replaced with a
programmable counter. This counter can
divide the video controller horizontal
sync pulse, other external clock source
or the internal chip clock source to
generate the burst frequency.
IMPORTANT: For the most current data, consult MICROSEMI’s website:
Protected By U.S. Patents: 5,615,093; 5,923,129; 5,930,121; 6,198,234; Patents Pending
*As Shown in Figure 1 (Typical Application)
The LX1689 is the latest generation
When compared to the original
The on-chip PLL circuit used to
TM
Actual Inverter Size
design,
New
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1689CPW-TR)
-40 to 85
identical
0 to 70
T
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
1.38in.
J
functions
(°C)
2.64in.
Actual Inverter Size
OR
(35mm)
D E S C R I P T I O N
(67mm)
module
LX1689 CCFL Inverter Layouts Examples*
and
M
.870 in.
(22mm)
IN
use of either a DC voltage or a PWM
input to simplify design. Programmable
polarity brightness control is retained,
except in the case of externally clocked
digital dimming.
regulators extend the input voltage range
of the IC up to 28 Volts without using
external circuitry as was required with our
previous
includes a new lamp strike detection
scheme that saves a package pin and three
external components.
monitor lamp current pulses at the I_SNS
input to determine if the lamp strikes and
if it stays ignited once operational.
each of three lamp inputs has significantly
reduced the lamp feedback component
count. In addition the controller features
include auto shutdown for open or broken
lamps, and a lamp fault detection with a
status reporting output.
3V
3V
V
P R O D U C T H I G H L I G H T
The brightness control input allows the
DD
Integrating full wave rectifiers for
P A C K A G E O R D E R I N F O
Integrated Products
®
http://www.microsemi.com
Microsemi
controllers.
.397 in
(10mm)
M
.
AX
28V
28V
Two onboard LDO
V
DD
Third Generation CCFL Controller
Internal circuits
The
RoHS Compliant / Pb-free Transition DC: 0442
PW
P
LX1689
RODUCTION
Plastic TSSOP
20-PIN
21
LX1689CPW
LX1689IPW
1
1
1
2
7
9
Bill of Materials
D
ATA
3 to 28 Volt Single Fixed (±20%)
Supply Operating Range
Selectable Analog/Digital
Dimming Modes
Digital Dimming Can Synch to
External Or Internal Clocks
User Programmable Digital
Dimming Burst Frequency
252 mS Power On Delay
Flexible Lamp Current
Compensation Input
Open Lamp Shutdown and Fault
Output Indicator
“On Chip” Full Wave Lamp
Current & Voltage Rectifiers
20 Pin TSSOP Package
Low Component Count /
Module Cost / Size
High “Nits/Watt” Efficiency
Operates Directly From 1 to 6
Li_Ion Cells
Lamp Current Compensation
Input Makes Indoor/Outdoor
And Wide Temperature Range
Applications Easy to Design
LX1689CPW
K E Y F E A T U R E S
Transformer
Total Count
Connectors
Capacitors
Dual FET
S
Resistors
HEET
B E N E F I T S
LX1689
Page 1

Related parts for lx1689

lx1689 Summary of contents

Page 1

... Shown in Figure 1 (Typical Application) T (° - Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1689CPW-TR) Copyright © 2000 Rev. 1.1, 2006-02-27 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Third Generation CCFL Controller ® ...

Page 2

... BRITE_C 7 14 +0.5V BRITE_R 8 13 BRITE_IN ENABLE PW P ACKAGE (Top View) RoHS / Pb-free 100% Matte Tin Lead Finish supply. LDO output is normally 5.3V _BATT supply. LDO output is normally _BATT LX1689 VDD_P VDD_A V_BATT OC_SNS OV_SNS I_SNS BRITE_OUT EA_OUT EA_IN I_R Page 2 ...

Page 3

... A/B outputs. In the strike mode lamp current is detected after 15 attempts a fault is likewise declared. ( See further LX1689 operation section) Copyright © ...

Page 4

... BRITE Filter Capacitor and FAULT Output. Used to convert higher frequency digital PWM inputs to proportional DC currents at the BRITE_OUT pin. The capacitor forms a low pass filter with an internal 200K resistor. This pin will be driven to VDD_A if a lamp fault is detected by the LX1689 fault is present the voltage at this pin BRITE_C will vary from 50mV to 1 ...

Page 5

... BRITE_IN Linear DC Voltage Range BRITE_IN PWM Logic Signal Voltage Range Digital Inputs (DIM_MODE, DIV_248,DIM_CLK) Maximum Output Gate Charge ( OUT Unless otherwise specified, the following specifications apply over the operating ambient temperature: LX1689CPW: 0 ° C ≤ ≤ LX1689IPW: -40°C T 85°C, except where otherwise noted. ...

Page 6

... V Reverse Dimming TL_DIM_CLK I DIM_CLK = 5V IH_DIM_CLK I DIM_CLK = 0V IL_DIM_CLK V TL_TRI_ V TF_TRI V TH_TRI I DIM_MODE = DIV_248 = 5V IH_TRI I DIM_MODE = DIV_248 = 0V IL_TRI Microsemi Integrated Products LX1689 RODUCTION ATA HEET LX1689 Min Typ Max 250 450 0.1 254 127 63.5 = 25°C 0.95 1.0 1.05 A 100 700 1.99 2 2.01 90 180 ...

Page 7

... OC_SNS = 10V OC_SNS IIN OC_SNS = -10V I_SNS = 0.3VDC 25°C A I_SNS = 2.0VDC 25°C A I_SNS RMS I_SNS = -0.3VDC 25°C A I_SNS = -2.0VDC 25°C A Microsemi Integrated Products LX1689 D S RODUCTION ATA HEET LX1689 Min Typ Max - 100 0.96 1.04 1.12 0.94 1.04 1.14 0.98 1.06 1.14 0.96 1.06 1. 120 2 10 ...

Page 8

... COUNTER & POW RESET LOGIC DIGITAL DIM ANALOG DIM RAMP GENERATO – Simplified Block Diagram IGURE Microsemi Integrated Products LX1689 RODUCTION ATA HEET OUTPUT DRIVERS BLOCK AO UT BOUT EA_OUT + - ERROR AMP EA_IN LAMP FEEDBACK CONDITIONING BLOCK ...

Page 9

... BRITE_R EA_OUT 6.65 BRITE_IN EA_IN ENABLE I_R LX1689CPW F 2 – LX1689 Typical 1W Application IGURE DIM_CLK DIMMING MODE External Burst External Clock Source Dimming from divided DIM_CLK input VDD_A Analog Dimming GND Analog Dimming ...

Page 10

... Copyright © 2000 Rev. 1.1, 2006-02-27 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Third Generation CCFL Controller ® – Typical Dual 4 Watt Application F IGURE Microsemi Integrated Products LX1689 RODUCTION ATA HEET + + x x Page 10 ...

Page 11

... Strike potential is removed immediately when the lamp strikes or if the time limit is reached. Strike Detection The LX1689 includes a new lamp strike detection scheme that In addition, the saves a package pin and three external components. Internal circuits monitor lamp current pulses at the I_SNS input to determine if the lamp strikes and if it stays ignited once operational ...

Page 12

... TM LX1689 OPERATION Four operating modes: Power On Delay, Strike, Run, and Fault modes are employed by the LX1689. Upon power up or ENABLE going true, Power On Delay is automatically invoked. Immediately after termination of Power On Delay, or ENABLE going true, strike mode is entered. After a successful strike, e.g. lamp is ignited, run mode is entered. If ignition is unsuccessful the lamp extinguishes while running, Fault mode is entered ...

Page 13

... L L Θ1 c *LC * Lead Coplanarity Note: 1. Dimensions do not include mold flash or protrusions; these shall not exceed 0.155mm(.006”) on any side. Lead dimension shall not include solder coverage. Microsemi Integrated Products LX1689 D S RODUCTION ATA HEET / I ( BRITE_OUT OUT RMS BRITE_R resistor ...

Page 14

... Microsemi reserves the right to change the configuration and performance of the product and to discontinue product at any time. Copyright © 2000 Rev. 1.1, 2006-02-27 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Third Generation CCFL Controller ® P RODUCTION Microsemi Integrated Products LX1689 D S ATA HEET Page 14 ...

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