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PDF LX1692B Data sheet ( Hoja de datos )
| Número de pieza | LX1692B | |
| Descripción | Full Bridge Resonant CCFL Controller | |
| Fabricantes | Microsemi Corporation | |
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TM
LX1692B
® Full Bridge Resonant CCFL Controller
PRODUCTION DATA SHEET
DESCRIPTION
Microsemi’s LX1692B is a cost The LX1692B regulates the CCFL
reduced, third generation CCFL (Cold brightness in three ways: analog
Cathode Fluorescent Lamp) controller. dimming, digital dimming, or combined
The integrated controller is optimized analog and digital dimming methods
to drive CCFL’s using resonant full simultaneously to achieve the widest
bridge inverter topology.
dimming range (> 60 to 1).
Resonant full bridge topology The LX1692B can accept a
provides near sinusoidal waveforms brightness control signal that is either
over a wide supply voltage range in an analog voltage or a low frequency
order to maximize the life of CCFL PWM.
lamps, control EMI emissions, and The LX1692B also features
maximize efficiency. This new archi- integrated gate drivers for the four
tecture also provides a wide dimming external power MOSFETs.
range.
An integrated 4V LDO powers all
The LX1692B includes safety internal control circuitry greatly
features that limit the transformer simplifying supply voltage require-
secondary voltage and protect against ments.
fault conditions which include open The LX1692B is available in a 20-
lamp, broken lamp, and short-circuit Pin TSSOP and SOIC.
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; 7,112,929; Patents Pending
PRODUCT HIGHLIGHT
LX1692B
C_R
A
I_R B
CC__BTOSPT art
C
D
BRITE_IN
EA_OUT ISNS
VSUPPLY
DUAL
FET
DUAL
FET
KEY FEATURES
For Wide Voltage Range Inverter
Application (7V to 22V)
Low Stress to Transformers
Wide Dimming Range
Analog Dimming: >3 to 1
Digital Dimming : >20 to 1
Combined: >60 to 1
Programmable Burst Dimming
Frequency
Programmable Time Out
Protection
Fixed Operating Frequency
Open Lamp Voltage Protection,
Short Lamp Protection, Arc
Protection1
BENEFITS
Even Display Light Distribution
Longer Lamp Life with Optimized
Lamp Current Amplitude
Reduced Operating Voltage
Lowers Corona Discharge and
Prolongs Module Life
High “Nits / Watt” Efficiency
Makes Less Heat and Brighter
Displays
APPLICATIONS
LCD TV
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
LX1692BIPW
LX1692BIDW
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1692BIPW-TR)
1 Arc protection is provided if the arcing level is enough to be trigged.
Copyright © 2005
Rev. 1.1, 12/20/2006
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
1 page  
www.DataSheet4U.com
TM
LX1692B
® Full Bridge Resonant CCFL Controller
PRODUCTION DATA SHEET
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, the following specifications apply over the operating ambient temperature -20°C ≤ TA ≤ 70°C except where
otherwise noted and the following test conditions:.
Parameter
Symbol
Test Conditions
` POWER
Power Supply Input Voltage
VDDP
Power Supply Output Voltage
VDD_A VDDP = 4.5V to 5.5V, I Load = 5 mADC
VDDP Operating Current
VDDP Operating Current
` ENABLE INPUT
ISB fLAMP = 62.5kHz, TA=25°C
IBB
CAOUT = CBOUT= CCOUT = CDOUT=2000pF,
fLAMP = 62.5kHz
ENABLE Logic Threshold
ENABLE threshold Hysteresis
ENABLE High
ENABLE Low
Sleep Mode Current
Input Resistance
` UNDER VOLTAGE LOCKOUT
VTH_EN
VH_EN
VEN_HIGH
VEN_LOW
IDD_SLEEP
RENR
VENABLE = 0V
UVLO Threshold VDDP
UVLO Hysteresis
` BRIGHTNESS CONTROL
VTH_UVLO_P
VH_UVLO
Rising edge
BRITE_A Voltage Range
VR_BR_A
Full Brightness BRITE_A Input
VBR_FULL _A VR_BR_D = VDDA, TA=25°C
Full Darkness BRITE_A Input
VDARK_FULL_A VR_BR_D = VDDA
Full Darkness BRITE_A input Offset VDARKFULL_OS VR_BR_D = VDDA, BRITE_A = 0V
BRITE_D Voltage Range
VR_BR_D
VR_BR_A = VDDA
Full Brightness BRITE_D Input
VBR_FULL _D VR_BR_A = VDDA, TA=25°C
Full Darkness BRITE_D Input
VDARK_FULL_D VR_BR_A = VDDA
` BURST RAMP GENERATOR
Ramp Valley Voltage
Ramp Peak Voltage
Ramp Frequency
Burst Duty Cycle Range
VRVV
VRPV
FRAMP
C_BST = 10nF, I_R = 40K, Ta=25°C
BRITE_D to DIMPWM Jitter
Burst PWM min Duty Resolution
` LAMP FREQUENCY GENERATOR
JBDD
DRBST
C_BST = 10nF, BRITE_D = 2.4V
Lamp Frequency Range
Lamp Ramp Frequency
FLAMP
FLAMP
Lamp Ignited, Run Mode, TA = 25°C, I_R = 40K,
C_R = 100pF
Lamp Ramp Frequency Regulation
FLAMP_REG
4.5 > VDDP < 5.5V, TA = 25°C
VDDP = 5.5V
Ramp Valley Voltage
Ramp Peak Voltage
Ramp PWM Jitter
VLRVV
VLRPV
LFJ
` VIN_SNS RAMP
Ramp Peak Clamp Voltage
VRPCV
VIN = 8V, C_P = C_R = 100pF, R_P = 100K
VDDP = 5V
VIN_SNS Discharge Current
IVRVV
LX1692B
Units
Min Typ Max
4.5 5.5 V
3.8 4.0 4.2
V
3.8 5.3 6.8 mA
10 15 mA
1.6 1.85 2.0
V
500 mV
2.4 VDDP V
0 0.8 V
20 50 µA
100 KΩ
3.8 4.2 V
200 mV
0 VDDP V
1.9 2 2.1 V
0V
0.35 0.45 0.55
V
0.4 VDDP V
2.37 2.5 2.63
V
0.43 0.55 0.67
V
0.43 0.55 0.67
2.37 2.5 2.63
230 250 270
0 100
13
1
V
V
Hz
%
µs
%
30 150 kHz
59.3 62.5 65.7 kHz
±0.5 % / V
±0.1 %/°C
0.2 V
2.0 V
1 µs
5
VDDP
+0.9
V
7 12.5 18 mA
Copyright © 2005
Rev. 1.1, 12/20/2006
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
5 Page 
www.DataSheet4U.com
TM
LX1692B
® Full Bridge Resonant CCFL Controller
PRODUCTION DATA SHEET
FUNCTIONAL DESCRIPTION (CONTINUED)
INTERMITTENT OR BROKEN LAMP AFTER SUCCESSFUL
IGNITION
After run mode is entered, an intermittent or open lamp
problem can also be detected at the ISNS input. After
ignition, peak voltage on the ISNS input is dependent on
lamp current amplitude and voltage on the BRITE_A pin.
I_SNS signal amplitude should be designed to be greater
than +/- 400 mVPK (280 mVRMS) to insure a false open
lamp fault shut down does not occur. A comparator
monitors ISNS and generates a reset pulse to a watch dog
timer for any peak voltage > 0.3V. The watch dog, a 9 bit
binary counter, is reset once every cycle of I_SNS voltage.
If lamp current flowing through the ISNS resistor is too low
(e.g., voltage is less than 0.3V peak), reset pulses are not
generated and the counter is allowed to overflow and set the
fault latch. Nominal short circuit duration is 500 micro
seconds when operating at 65 KHz.
ON CHIP LDO REGULATOR
Output voltage is 4.0 +/-5%. Supplies all internal circuitry
except output driver stage. Capable to source 5mA to
external circuitry.
SHORT CIRCUITS ACROSS THE LAMP TERMINALS,
SHORTS FROM THE HIGH VOLTAGE TERMINAL TO
GROUND AND SHORT CIRCUITS FROM GROUND TO THE
LOW SIDE LAMP TERMINAL.
A Short to ground from the lamp return terminal also
shorts out the lamp current sense resistor, removing current
feedback to the controller. This short is detected as a rise
in voltage across the OC_SNS resistor which is located on
the normally grounded side of the HV transformer
secondary. A comparator senses peak voltage > 2.0Vdc at
the OC_SNS pin. This comparator clocks the 4 bit watch
dog timer described above in the open lamp fault logic.
Sixteen events during a single cycle of the C_BST signal
will overflow the watchdog counter and cause an over
current shut down during either strike or run mode.
UNDER VOLTAGE LOCKOUT
Keeps chip outputs active off until VDDA is high enough
to insure stable operation.
DIMMING MODES
Separate input pins are available for digital and analog
dimming modes for maximum flexibility. See dimming
truth table below. Digital dimming rise and fall times can
be controlled by the ICOMP capacitor (See Dimming
Modes Table).
DIMMING MODES
MODE
DC voltage controlled analog
External PWM controlled digital
DC voltage controlled digital
Analog + voltage controlled Digital
BRITE A
0 – 2V
VDDA
VDDA
0 -2V
BRITE D
VDDA
PWM
0.5-2.5V
0.5-2.5V
ISNS
CBST
cap
cap
Cap
Cap
I Range
3:1
60:1
30:1
60:1
Note: For Reverse analog dimming, BRITE_A signal inversion must occur external to the controller
Copyright © 2005
Rev. 1.1, 12/20/2006
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet LX1692B.PDF ] | |
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