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  Microsemi Electronic Components Datasheet  

LX1692 Datasheet

Full Bridge Resonant CCFL Controller

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TM
LX1692
® Full Bridge Resonant CCFL Controller
PRODUCTION DATA SHEET
DESCRIPTION
Microsemi’s LX1692 is a cost The LX1692 regulates the CCFL
reduced, third generation Direct Drive brightness in three ways: analog
CCFL (Cold Cathode Fluorescent dimming, digital dimming, or combined
Lamp) controller. The integrated analog and digital dimming methods
controller is optimized to drive simultaneously to achieve the widest
CCFL’s using resonant full bridge dimming range (> 60 to 1).
inverter topology.
The LX1692 can accept a brightness
Resonant full bridge topology control signal that is either an analog
provides near sinusoidal waveforms voltage or a direct low frequency PWM.
over a wide supply voltage range in The LX1692 also features integrated
order to maximize the life of CCFL gate drivers for the four external power
lamps, control EMI emissions, and MOSFETs.
maximize efficiency. This new archi- An integrated 4V LDO powers all
tecture also provides a wide dimming internal control circuitry which greatly
range.
simplifies supply voltage requirements.
The LX1692 includes safety The LX1692 is available in a 20-Pin
features that limit the transformer TSSOP and SOIC.
secondary voltage and protect against
fault conditions which include open
lamp, broken lamp and short-circuit
faults.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
Protected by U.S. Patents: 5,615,093; 5,923,129; 5,930,121; 6,198,234; Patents Pending
PRODUCT HIGHLIGHT
LX1692
C_R
A
I_R B
C_BST
C
Part
C_TO
D
BRITE_IN
EA_OUT ISNS
VSUPPLY
DUAL
FET
DUAL
FET
KEY FEATURES
ƒ For Wide Voltage Range Inverter
Application (7V to 22V)
ƒ Patent Resonant Strike for
Unsurpassed Striking Power
Combined with Best Efficiency
ƒ Low Stress to Transformers
ƒ Excellent Open Circuit Voltage
Regulation Reduces Transformer
Breakdown Voltage
Requirements While Striking
Higher Voltage Lamps
ƒ One Inverter for Multiple Panel
Types
ƒ Wide Dimming Range
Analog Dimming: >3 to 1
Digital Dimming : >20 to 1
Combined: >60 to 1
ƒ Fool-Proof Striking
ƒ Programmable Burst Dimming
Frequency
ƒ Programmable Time Out
Protection
ƒ Fixed Operating Frequency
ƒ Open Lamp Voltage Protection,
Short Lamp Protection, Arc
Protection1
BENEFITS
ƒ Even Display Light Distribution
ƒ Longer Lamp Life with Optimized
Lamp Current Amplitude
ƒ Reduced Operating Voltage
Lowers Corona Discharge and
Prolongs Module Life
ƒ High “Nits / Watt” Efficiency
Makes Less Heat and Brighter
Displays
APPLICATIONS
ƒ LCD TV
ƒ LCD Monitor
TA (°C)
-20 to +85
PACKAGE ORDER INFO
Plastic TSSOP
PW 20-Pin
Plastic SOIC
DW 20-Pin
RoHS Compliant / Pb-free
RoHS Compliant / Pb-free
LX1692IPW
LX1692IDW
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1692IPW-TR)
1 Arc protection is provided if the arcing level is enough to be trigged.
Copyright © 2004
Rev. 1.0, 11/10/2005
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1


  Microsemi Electronic Components Datasheet  

LX1692 Datasheet

Full Bridge Resonant CCFL Controller

No Preview Available !

www.DataSheet4U.com
LX1692
TM ® Full Bridge Resonant CCFL Controller
PRODUCTION DATA SHEET
ABSOLUTE MAXIMUM RATINGS
Supply Input Voltage(VDDP)........................................................................................ 6V
VIN_SNS ..................................................................................... -0.3V to VDDP+0.5V
Digital Input (ENABLE)................................................................. -0.3V to VDDP+0.5V
Analog Inputs (ISNS, OV_SNS, OC_SNS)clamped to ±14V Max Peak Current ±100mA
Analog Inputs (BRITE_A, BRITE_D)........................................... -0.3V to VDDP +0.5V
Digital Outputs (AOUT, BOUT, COUT, DOUT).......................... -0.3V to VDDP +0.5V
Analog Outputs (I_R, ICOMP, VCOMP) ..................................... -0.3V to VDDP + 0.5V
Maximum Operating Junction Temperature .............................................................150°C
Storage Temperature Range........................................................................... -65 to 150°C
Peak Package Solder Reflow Temp.(40 seconds max. exposure) .................260°C(+0, -5)
Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to
Ground. Currents are positive into, negative out of specified terminal.
THERMAL DATA
DW Plastic SOIC 20-Pin
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
85°C/W
PW Plastic TSSOP 20-Pin
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
99°C/W
Junction Temperature Calculation: TJ = TA + (PD x θJA).
The θJA numbers are guidelines for the thermal performance of the device/pc-board system. All of the
above assume no ambient airflow.
PACKAGE PIN OUT
VDDA
C_R
C_BST
C_TO
I_R
ENABLE
BRITE_A
VIN_SNS
BRITE_D
VCOMP
1 20
10 11
PW PACKAGE
(Top View)
VDDP
AOUT
BOUT
GND
COUT
DOUT
ISNS
OV_SNS
ICOMP
OC_SNS
VDDA
C_R
C_BST
C_TO
I_R
ENABLE
BRITE_A
VIN_SNS
BRITE_D
VCOMP
1 20
2 19
3 18
4 17
5 16
6 15
7 14
8 13
9 12
10 11
DW PACKAGE
(Top View)
VDDP
AOUT
BOUT
GND
COUT
DOUT
ISNS
OV_SNS
ICOMP
OC_SNS
RoHS / Pb-free 100% Matte Tin Lead Finish
Name
C_R
I_R
FUNCTIONAL PIN DESCRIPTION
Description
Lamp Frequency Programming Capacitor Pin – lamp running frequency is set by the combination of C_R and
I_R. The internal lamp current oscillator frequency can be forced to follow an external clock signal at this pin. In
this case, the programmed frequency must be lower than the external frequency. Minimum pulse width for
external synch signal is 1µsec. Maximum duty is 50%
Current Reference Resistor Input. Connects to an external resistor that determines the magnitude of internal
bias currents. The I_R pin is a DC reference voltage of 1V. This voltage cannot be used for other than its
intended function. The reference current established at this pin by connecting an external resistor is used to
charge a capacitor at the C_R pin. The nominal lamp frequency can be adjusted by varying this resistor value in
the range of 20K to 100K Ohms. (Note: C is in pF, R is in KΩ , Freq is in KHz).
FLAMP
=
242 × 103
CC _ R RI _ R
Other reference currents derived from I_R are used for the digital dimming burst oscillator and the strike time
out function.
Copyright © 2004
Rev. 1.0, 11/10/2005
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2


Part Number LX1692
Description Full Bridge Resonant CCFL Controller
Maker Microsemi Corporation
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