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PDF LXE1686-OX Data sheet ( Hoja de datos )
| Número de pieza | LXE1686-OX | |
| Descripción | INVERTER EVALUATION BOARD | |
| Fabricantes | Microsemi Corporation | |
| Logotipo |  |
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LXE1686-0x
INVERTER EVALUATION BOARD
Copyright © 2000
Rev 1.0c, 2000-08-31
Page 1
1 page  
LXE1686-0x
INVERTER EVALUATION BOARD
recommended that the voltage variation exceed a 1½
to 1 range. It is possible to supply both inverter logic
and main power draw to the same fixed 3.3V to 5.5V
source, if application system power can
accommodate. Precautions regarding inverter effects
on application system power:
LINFINITY inverter topology incorporates both high
frequency PWM power switching of the CCFL output
transformer and low frequency PWM burst current
dimming techniques. If inverter power draw is not
properly conditioned or isolated from application
system logic devices, interference from inverter
switching frequencies may occur. Example, inter-
ference may occur in visual form, as a result of
inverter noise imposed on power source shared by
video processor logic.
APPLICATION SYSTEM CONTROL INTERFACE
Inverter functional controls, such as vertical
synchronization and remote enable/disable should be
addressed by digital means. Brightness control can
be done by either linear and/or digital means. The
lowest inverter parts count brightness control method
would require a direct PWM logic input in the 100 to
1000Hz range. This control method should ideally
have the PWM logic signal synchronized with the
vertical frame rate, especially if the panel application
is an STN type LCD. Other brightness control
methods could be configured such as to convert a
digital logic signal into a DC potential with less than
10mVpk-pk ripple from a 495mV to 2.55V range.
Conversion device examples: DAC, digital
potentiometer, op-amp/integrator, and R/C network.
Special consideration as to how control interfaces are
presented to the inverter during system power-up
sequence will affect things like initial screen
brightness and stability. If various control interfaces
undergo unstable transitions during system power-up,
then suspending inverter enable during such time
periods is recommended to avoid undesirable visual
flashes or flicker.
OUTPUT TRANSFORMER SELECTION
Output transformer selection needs to be based on
two criteria:
1. Maximum operational lamp power
2. Secondary to primary turns count ratio
The first criteria is simply selecting from one of three
LINFINITY transformer styles based on your
applications maximum lamp power. This selection will
lead to which version of the LXE1686-0x evaluation
board you require. Lamp power consumption can be
derived from the LCD MFR specification (or actual lab
measurements) of lamp current multiplied by lamp run
voltage.
Linfinity offers the following three transformer types
for the indicated maximum recommended power
level. Each power level is matched with a cor-
responding version of the evaluation board:
• LMT3811 : 7.0Watt
LXE1686-01
• LMT2110 : 4.0Watt
LXE1686-02
• LMT2608 : 2.4Watt
LXE1686-03
The second criteria for transformer turns ratio, can be
estimated from the following definitions and formula:
Tratio Transformer secondary / primary wire turns count
Vlamp Maximum lamp run voltage value (actual value at
maximum operational lamp current)
Vin Minimum voltage value of inverter main input
power
ƒ Transformer correlation factor, typical value =
1.85 (unless otherwise specified)
Estimation formula: Tratio = Vlamp
Vin × f
Select from available LMI output transformer turns
ratios that are closest to the value that you estimate. If
one does not yet exist, please contact an LMI inverter
applications engineer to specify a custom.
Mount transformer choice in one of the three T1-A, B,
C locations that matches transformer footprint.
INVERTER DESIGN BOARD FEATURES
The LXE1686-0x inverter evaluation/design board will
require separate main (VIN POWER) and logic(VIN
LOGIC) power supplies.
All critical inverter input and output interfaces are
provided via a variety of fly wire, banana jack and
common connector options.
Inverter board is pre-configured with optional
brightness control conditioning circuit that can be
adjusted via the BRITE CNTL input or a board
mounted multi-turn potentiometer (R30B). This
flexible conditioning circuit allows for linear DC or
PWM brightness control from 0 to 2.5V and 500 to
5000Hz. Minimum and maximum brightness
thresholds are established thru this configurable
Copyright © 2000
Rev 1.0c, 2000-08-31
Page 5
5 Page 
LXE1686-0x
Zoom shot of previous
INVERTER EVALUATION BOARD
Chan 1 P5 (OLSNS)
Chan 2 P7 (ICOMP)
Chan 3 P17 (BRT)
Chan 4 Output Current
Chan 1 P16 (VCO_C)
Chan 2 P17 (BRT)
Chan 3 P26 (FVERT)
Chan 4 Output Current
Zoom shot of above
Chan 1 P16 (VCO_C)
Chan 2 P17 (BRT)
Chan 3 P26 (FVERT)
Chan 4 Output Current
Copyright © 2000
Rev 1.0c, 2000-08-31
Page 11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet LXE1686-OX.PDF ] | |
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