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  Microsemi Electronic Components Datasheet  

LX1691 Datasheet

Enhanced Multi-Mode CCFL Controller

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TM
LX1691
® Enhanced Multi-Mode CCFL Controller
PRODUCTION DATA SHEET
DESCRIPTION
Microsemi’s LX1691 is a cost
reduced, enhanced feature set, Direct
Drive CCFL (Cold Cathode Fluorescent
Lamp) Controller. Its architecture is
based on the very popular LX1689. By
limiting VDDP to 5.5V and using
advanced processing, die size and
package pin count is decreased while
improving dimming precision.
LX1691 based inverter modules can
be designed for virtually any CCFL
appliance from digital cameras and
PDA’s to big screen monitors and
driver viewable automotive displays.
New versatile dimming circuitry can
accept digital and analog control inputs
and provides six different dimming
modes that control both lamp current
amplitude and duty cycle, either simul-
taneously or separately. Designers can
select normal or reverse polarity
dimming and precisely program mini-
mum and maximum lamp currents with
resistors. The LX1691 fault shutdown
feature is enhanced to include regu-
lation and shutdown for over voltage
and over current conditions.
Microsemi’s proven and patented
Direct Drive architecture works with
system voltages from 3 volts to more
than 50 volts, limited only by the
external power FET’s that drive the high
voltage transformer.
The LX1691 includes the Microsemi
proven and patented strike method that
allows significant efficiency gains while
guaranteeing strong striking power at all
operating temperatures. Our method
sweeps strike frequency smoothly up to
the unloaded resonant frequency of the
lamp and high voltage transformer.
This, coupled with the LX1691’s active
high output voltage regulation, produces
just enough strike voltage without
generating unpredictable high voltage
spikes that cause arcing and component
failures. Competitive devices that
simply switch to a higher frequency for
striking do not have this “real time”
control over output voltage, and require
much more attention to transformer
design.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
KEY FEATURES
ƒ Simultaneous Amplitude And
Duty Cycle Dimming Modes
ƒ Resistor Programmable Min and
Max Lamp Currents
ƒ Digital Dimming Can Synch To
External Or Internal Clocks
ƒ 100 ms Power On Delay
ƒ Open Or Shorted Lamp
Regulation & Shutdown
ƒ “On Chip” Full Wave Lamp
Current & Voltage Rectifiers
ƒ 16 Pin TSSOP Package
ƒ Very Stable Oscillator with On-
Chip Timing Capacitor
ƒ Soft Start-Up Striking
ƒ Enhanced Digital Dimming
Resolution
BENEFITS
ƒ Low Component Count / Module
Cost / And Size
ƒ High “Nits/Watt” Efficiency
ƒ Operates Directly From a Single
Li-Ion Cell
ƒ Industries Safest And Highest
Performing Strike Voltage
Generation (Patented)
ƒ Tight Operating Frequency
Tolerance For Easier System
Level RFI Control
Traditional Analog
2 BRITE_IN
PRODUCT HIGHLIGHT
Lamp Current (mA)
+
External Digital
2 BRITE_IN
Lamp Current (mA)
+
+3V
0
T1
T2 DD_CLK
Internal Digital
2 BRITE_IN
+3V
0
T
DD_CLK
T = 512 / Lamp Frequency
_
T1 T2
Lamp Current (mA)
+
0
T
DD_CLK
T = 512 / DD_CLK Frequency
Direct PWM (Analog)
2 BRITE_IN
_
T
Lamp Current (mA)+
_
T
0
T1
T2 DD_CLK
Four of Six Dimming Modes
T1
_
T2
Copyright © 2003
Rev. 1.0, 7/16/2004
PACKAGE ORDER INFO
TA (°C)
MIN VDDP
PWMAX VDDP
Plastic TSSOP
16-PIN
-40 to +85
2.8V
5.5V
LX1691IPW
Pb-free
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1691IPWTR)
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1


  Microsemi Electronic Components Datasheet  

LX1691 Datasheet

Enhanced Multi-Mode CCFL Controller

No Preview Available !

LX1691
TM ® Enhanced Multi-Mode CCFL Controller
PRODUCTION DATA SHEET
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VDDP) ..................................................................................................... 6V
Digital Input (ENABLE)....................................................................... -0.3V to VDDP +0.5V
Analog Inputs (I_SNS, OC_SNS, OV_SNS)clamped to +/- 10V. Max peak current +/-100mA
Analog Inputs (BRITE_IN)................................................................... -0.3V to VDDP +0.5V
DIM_MODE Input ................................................................................ -0.3V to VDDP +0.5V
DD_CLK Digital Input ........................................................................ 0.3V to VDDP +0.5V
Digital Output (AOUT, BOUT) .................................................................. -0.3V to VDDP +0.5V
Analog Outputs (BRITE_R, I_R, EA_OUT,BRITE_OUT) ....................... -0.3V to VDDP +0.5V
Operating Temperature Range ........................................................................ -55 to 125°C
Maximum Junction Temperature ...............................................................................150°C
Package Peak Temperature for Solder Reflow (40 Seconds Maximum Exposure) ......... 255°C (+5 -0)
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.
PACKAGE PIN OUT
GND
AOUT
BOUT
DIM_CLK
DIM_MODE
BRITE_OUT
BRITE_R
BRITE_IN
1
2
3
4
5
6
7
8
16 VDDP
15 VDDA
14 OP_SNS
13 VIN_SNS
12 I_SNS
11 EA_OUT
10 I_R
9 ENABLE
PW PACKAGE
(Top View)
Pb-free 100% Matte Tin Lead Finish
THERMAL DATA
PW Plastic TSSOP 16-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.
PIN NAME
GND
VDDP
VDDA
AOUT
BOUT
DD_CLK*
FUNCTIONAL PIN DESCRIPTION
DESCRIPTION
Ground
Voltage Input, 3.0 to 5.5V input range. VDDP is switched (see ENABLE) to remove power from chip. An LDO
regulator follows the switch and generates VDDA (see VDDA). The output driver stages are powered directly from
the VDDP input. Care must be taken in power distribution design to minimize transients and noise coupling from
VDDP to the VDDA output.
Analog VDDA Supply Output. This output pin is used to connect an external capacitor to stabilize and filter the on
chip VDDA LDO regulator. The input of the LDO is the switched VDDP supply. LDO output is normally 3.0V and is
used to drive all circuitry except the output buffers at AOUT and BOUT. Drop out voltage is typically 50mV (@
25°C) at 5mA, the average internal load. This output can supply up to a 5 mA external load. The output
capacitor recommended is <1000nF of the ceramic dielectric type.
A buffer N-FET driver output. 10K internal pull down, ± 100 mA peak current with 3 VDC applied to VDDP pin.
B buffer N-FET driver output. 10K internal pull down, ± 100 mA peak current with 3 VDC applied to VDDP pin.
Digital Dimming Clock / Dimming Polarity. An input pin that may be selected to control burst frequency for Digital
Dimming. This input can be forced to VDDA or VSS or any clock signal up to 1MHz. This pin is also used to
control the dimming polarity when operating in the internally clocked digital dimming mode*. If DIM_MODE is in
the open condition (Analog Dimming Mode) the DD_CLK input is tied to VDDA or open (internal pull-up) to select
conventional dimming polarity. It is tied to Ground for reverse polarity. Conventional polarity means that lamp
brightness increases with increasing voltage on the BRITE_IN pin. Reverse polarity means that brightness
decreases with increasing voltage. If DIM_MODE is open and a low frequency pulse is applied to DD_CLK, lamp
current amplitude is directly proportional to the voltage at BRITE_IN, and its duty cycle follows the DD_CLK
waveform, e.g., current flows when DD_CLK is high. In this mode pulse count should be greater than fault
count..
Copyright © 2003
Rev. 1.0, 7/16/2004
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2


Part Number LX1691
Description Enhanced Multi-Mode CCFL Controller
Maker Microsemi Corporation
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